{"id":"CVE-2026-96636","aliases":["BIT-pillow-2026-96636","CLSA-2026-1793025111","CLSA-2026-1793085879","CLSA-2026-1793099358","CLSA-2026-1793346161","DEBIAN-CVE-2026-96636","EUVD-2026-107572","GHSA-p8hx-v2p6-rp84","PYSEC-2026-4337","SUSE-SU-2026:5038-1","SUSE-SU-2026:5194-1","UBUNTU-CVE-2026-96636","openSUSE-SU-2026:12251-1","openSUSE-SU-2026:22246-1"],"status":"published","title":"Pillow: Decompression-bomb protection bypass via multi-frame seek() in MPO and DCX (MpoImageFile.seek / DcxImageFile.seek)","description":"Pillow is a Python imaging library. Prior to 13.0.0, MpoImageFile.seek() and DcxImageFile.seek() reparse later MPO or DCX frames and replace self._size without rerunning Image._decompression_bomb_check(). A crafted multi-frame image can use a tiny first frame to pass Image.open() and then declare an over-limit later frame. Normal frame iteration through seek(), load(), or ImageSequence.Iterator can decode that frame and commit hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00345,"percentile":0.28358,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400","CWE-409"],"published":"2026-10-21T21:05:20Z","modified":"2026-11-12T12:27:19Z","fixes":[{"ecosystem":"PyPI","package":"pillow","fixed_in":["13.0.0"],"sources":["ghsa","osv"]},{"ecosystem":"Bitnami","package":"pillow","fixed_in":["13.0.0"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"13.0.0"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"pillow","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"13.0.0"}]}]},{"source":"osv","ecosystem":"TuxCare:PyPI","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"11.3.0"},{"fixed":"11.3.0.post12+tuxcare"}]}],"versions":["11.3.0","11.3.0.post1+tuxcare","11.3.0.post10+tuxcare","11.3.0.post11+tuxcare","11.3.0.post2+tuxcare","11.3.0.post3+tuxcare","11.3.0.post4+tuxcare","11.3.0.post5+tuxcare","11.3.0.post6+tuxcare","11.3.0.post7+tuxcare","11.3.0.post8+tuxcare","11.3.0.post9+tuxcare"],"bundled":3},{"source":"osv","ecosystem":"TuxCare:PyPI","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"11.2.1"},{"fixed":"11.2.1.post13+tuxcare"}]}],"versions":["11.2.1","11.2.1.post1+tuxcare","11.2.1.post10+tuxcare","11.2.1.post11+tuxcare","11.2.1.post12+tuxcare","11.2.1.post2+tuxcare","11.2.1.post3+tuxcare","11.2.1.post4+tuxcare","11.2.1.post5+tuxcare","11.2.1.post6+tuxcare","11.2.1.post7+tuxcare","11.2.1.post8+tuxcare","11.2.1.post9+tuxcare"],"bundled":9},{"source":"osv","ecosystem":"TuxCare:PyPI","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"10.4.0"},{"fixed":"10.4.0.post15+tuxcare"}]}],"versions":["10.4.0","10.4.0.post1+tuxcare","10.4.0.post10+tuxcare","10.4.0.post11+tuxcare","10.4.0.post12+tuxcare","10.4.0.post13+tuxcare","10.4.0.post14+tuxcare","10.4.0.post2+tuxcare","10.4.0.post3+tuxcare","10.4.0.post4+tuxcare","10.4.0.post5+tuxcare","10.4.0.post6+tuxcare","10.4.0.post7+tuxcare","10.4.0.post8+tuxcare","10.4.0.post9+tuxcare"],"bundled":8},{"source":"osv","ecosystem":"TuxCare:PyPI","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.5.0"},{"fixed":"9.5.0.post13+tuxcare"}]}],"versions":["9.5.0","9.5.0.post1+tuxcare","9.5.0.post10+tuxcare","9.5.0.post11+tuxcare","9.5.0.post12+tuxcare","9.5.0.post2+tuxcare","9.5.0.post3+tuxcare","9.5.0.post4+tuxcare","9.5.0.post5+tuxcare","9.5.0.post6+tuxcare","9.5.0.post7+tuxcare","9.5.0.post8+tuxcare","9.5.0.post9+tuxcare"],"bundled":7},{"source":"osv","ecosystem":"Debian:12","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["10.0.0-1","10.1.0-1","10.2.0-1","10.3.0-1","10.3.0-2","10.4.0-1","10.4.0-1.1","11.1.0-1","11.1.0-2","11.1.0-3","11.1.0-4","11.1.0-5","11.2.1-1","11.3.0-1","12.0.0-1","12.1.0-1","12.1.1-1","12.1.1-2","12.2.0-1","12.3.0-1","13.0.0-1","9.4.0-1.1","9.4.0-1.1+deb12u1","9.5.0-1"]},{"source":"osv","ecosystem":"Debian:13","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11.1.0-5","11.1.0-5+deb13u1","11.1.0-5+deb13u2","11.1.0-5+deb13u3","11.1.0-5+deb13u4","11.2.1-1","11.3.0-1","12.0.0-1","12.1.0-1","12.1.1-1","12.1.1-2","12.2.0-1","12.3.0-1","13.0.0-1"]},{"source":"osv","ecosystem":"Debian:14","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11.1.0-5","11.2.1-1","11.3.0-1","12.0.0-1","12.1.0-1","12.1.1-1","12.1.1-2","12.2.0-1","12.3.0-1","13.0.0-1"]},{"source":"osv","ecosystem":"PyPI","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"13.0.0"}]}],"versions":["1.0","1.1","1.2","1.3","1.4","1.5","1.6","1.7.0","1.7.1","1.7.2","1.7.3","1.7.4","1.7.5","1.7.6","1.7.7","1.7.8","10.0.0","10.0.1","10.1.0","10.2.0","10.3.0","10.4.0","11.0.0","11.1.0","11.2.1","11.3.0","12.0.0","12.1.0","12.1.1","12.2.0","12.3.0","2.0.0","2.1.0","2.2.0","2.2.1","2.2.2","2.3.0","2.3.1","2.3.2","2.4.0","2.5.0","2.5.1","2.5.2","2.5.3","2.6.0","2.6.1","2.6.2","2.7.0","2.8.0","2.8.1","2.8.2","2.9.0","3.0.0","3.1.0","3.1.0.rc1","3.1.0rc1","3.1.1","3.1.2","3.2.0","3.3.0","3.3.1","3.3.2","3.3.3","3.4.0","3.4.1","3.4.2","4.0.0","4.1.0","4.1.1","4.2.0","4.2.1","4.3.0","5.0.0","5.1.0","5.2.0","5.3.0","5.4.0","5.4.0.dev0","5.4.1","6.0.0","6.1.0","6.2.0","6.2.1","6.2.2","7.0.0","7.1.0","7.1.1","7.1.2","7.2.0","8.0.0","8.0.1","8.1.0","8.1.1","8.1.2","8.2.0","8.3.0","8.3.1","8.3.2","8.4.0","9.0.0","9.0.1","9.1.0","9.1.1","9.2.0","9.3.0","9.4.0","9.5.0"]},{"source":"osv","ecosystem":"PyPI","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"13.0.0"}]}],"versions":["1.0","1.1","1.2","1.3","1.4","1.5","1.6","1.7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Notes","article","web","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96636","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-p8hx-v2p6-rp84"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96636.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-96636","tags":["advisory"]},{"url":"https://github.com/python-pillow/Pillow","tags":["package"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20265038-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1286256","tags":["report"]},{"url":"https://bugzilla.suse.com/1286273","tags":["report"]},{"url":"https://bugzilla.suse.com/1286287","tags":["report"]},{"url":"https://bugzilla.suse.com/1286311","tags":["report"]},{"url":"https://bugzilla.suse.com/1286314","tags":["report"]},{"url":"https://bugzilla.suse.com/1286325","tags":["report"]},{"url":"https://bugzilla.suse.com/1286368","tags":["report"]},{"url":"https://bugzilla.suse.com/1286370","tags":["report"]},{"url":"https://bugzilla.suse.com/1286372","tags":["report"]},{"url":"https://bugzilla.suse.com/1286381","tags":["report"]},{"url":"https://bugzilla.suse.com/1286396","tags":["report"]},{"url":"https://bugzilla.suse.com/1286397","tags":["report"]},{"url":"https://bugzilla.suse.com/1286398","tags":["report"]},{"url":"https://bugzilla.suse.com/1286400","tags":["report"]},{"url":"https://bugzilla.suse.com/1286401","tags":["report"]},{"url":"https://bugzilla.suse.com/1286402","tags":["report"]},{"url":"https://bugzilla.suse.com/1286403","tags":["report"]},{"url":"https://bugzilla.suse.com/1286404","tags":["report"]},{"url":"https://bugzilla.suse.com/1286405","tags":["report"]},{"url":"https://bugzilla.suse.com/1286406","tags":["report"]},{"url":"https://bugzilla.suse.com/1286408","tags":["report"]},{"url":"https://bugzilla.suse.com/1286411","tags":["report"]},{"url":"https://bugzilla.suse.com/1286489","tags":["report"]},{"url":"https://bugzilla.suse.com/1286796","tags":["report"]},{"url":"https://bugzilla.suse.com/1286797","tags":["report"]},{"url":"https://bugzilla.suse.com/1286798","tags":["report"]},{"url":"https://bugzilla.suse.com/1286801","tags":["report"]},{"url":"https://bugzilla.suse.com/1286802","tags":["report"]},{"url":"https://bugzilla.suse.com/1286804","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112390","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112391","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112392","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112393","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112394","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112397","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112398","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112399","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112400","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112401","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112402","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112403","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112405","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112406","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112891","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112892","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112894","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112895","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112896","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112897","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112899","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112900","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112901","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112902","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96636","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96637","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96640","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96641","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96642","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20265194-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1286312","tags":["report"]},{"url":"https://bugzilla.suse.com/1286388","tags":["report"]},{"url":"https://bugzilla.suse.com/1286399","tags":["report"]},{"url":"https://bugzilla.suse.com/1286793","tags":["report"]},{"url":"https://bugzilla.suse.com/1286800","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112395","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112404","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112898","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96638","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96778","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2026-96636","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-96636","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1286313","tags":["report"]},{"url":"https://bugzilla.suse.com/1286392","tags":["report"]},{"url":"https://bugzilla.suse.com/1286795","tags":["report"]},{"url":"https://bugzilla.suse.com/1286799","tags":["report"]},{"url":"https://bugzilla.suse.com/1286803","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112396","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-112893","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-114501","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96639","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-96643","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-96636","title":"Pillow: Decompression-bomb protection bypass via multi-frame seek() in MPO and DCX (MpoImageFile.seek / DcxImageFile.seek)","description":"Pillow is a Python imaging library. Prior to 13.0.0, MpoImageFile.seek() and DcxImageFile.seek() reparse later MPO or DCX frames and replace self._size without rerunning Image._decompression_bomb_check(). A crafted multi-frame image can use a tiny first frame to pass Image.open() and then declare an over-limit later frame. Normal frame iteration through seek(), load(), or ImageSequence.Iterator can decode that frame and commit hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","status":"published","published":"2026-10-21T21:05:20.85Z","modified":"2026-10-30T16:08:33.388Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-400","CWE-409"],"updated_at":"2026-11-02T14:20:00.879257Z"}],"euvd":[{"id":"EUVD-2026-107572","description":"Pillow is a Python imaging library. Prior to 13.0.0, MpoImageFile.seek() and DcxImageFile.seek() reparse later MPO or DCX frames and replace self._size without rerunning Image._decompression_bomb_check(). A crafted multi-frame image can use a tiny first frame to pass Image.open() and then declare an over-limit later frame. Normal frame iteration through seek(), load(), or ImageSequence.Iterator can decode that frame and commit hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","status":"published","published":"2026-10-21T21:05:20Z","modified":"2026-10-30T16:08:33Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:59:05.913237Z"}],"ghsa":[{"id":"GHSA-p8hx-v2p6-rp84","title":"Pillow: Decompression-bomb protection bypass via multi-frame seek() in MPO and DCX (MpoImageFile.seek / DcxImageFile.seek)","description":"### Summary\nPillow's decompression-bomb protection (`Image._decompression_bomb_check`, gated by `Image.MAX_IMAGE_PIXELS`) is enforced only on the **first frame**, inside `Image.open()`. For multi-frame formats, `seek()` re-parses the target frame's header and resets `self._size`. `GifImagePlugin` and `TiffImagePlugin` re-run the bomb check on `seek()`, but **`MpoImageFile.seek()` and `DcxImageFile.seek()` do not.** A crafted MPO or DCX whose first frame is tiny (passing the check) but whose later frame declares enormous dimensions therefore bypasses the protection: loading that frame decodes an over-limit image and commits large amounts of memory — a denial of service (memory exhaustion / OOM).\n\nSame class as the recently assigned CVE-2026-55379 (BdfFontFile), CVE-2026-55380 (GdImageFile) and CVE-2026-40192 (FITS GZIP).\n\n### Details\n`Image.open()` → `_open_core()` runs `_decompression_bomb_check(im.size)` once, on the frame present at open time. Both vulnerable `seek()` methods re-parse a new frame and set a new `self._size` without re-checking:\n\n- **`PIL/MpoImagePlugin.py`, `MpoImageFile.seek()`**: calls `JpegImagePlugin.JpegImageFile._open(self)` (which sets `self._size` from the frame's JPEG SOF) and rebuilds `self.tile`, with no `Image._decompression_bomb_check(self.size)`.\n- **`PIL/DcxImagePlugin.py`, `DcxImageFile.seek()`**: calls `PcxImageFile._open(self)` (which sets `self._size` from the page's PCX header), with no check.\n\nConfirmed present in **12.3.0** (latest release) and on **`main`** (13.0.0.dev0). Compare `GifImagePlugin._seek` and `TiffImagePlugin`, which call `_decompression_bomb_check` correctly on seek.\n\n### PoC\nSelf-contained; the victim uses **default** `MAX_IMAGE_PIXELS`:\n\n```python\nimport io\nfrom PIL import Image\n\n# attacker builds the file (guard disabled only to CREATE the oversized frame)\nImage.MAX_IMAGE_PIXELS = None\nsmall = Image.new(\"RGB\", (8, 8))\nbig   = Image.new(\"RGB\", (14000, 14000), (120, 60, 30))   # 196,000,000 px \u003e error threshold\nbuf = io.BytesIO()\nsmall.save(buf, format=\"MPO\", save_all=True, append_images=[big])\ndata = buf.getvalue()                                      # ~3 MB\nImage.MAX_IMAGE_PIXELS = int(1024 * 1024 * 1024 // 4 // 3) # restore default\n\n# victim (default limits)\nim = Image.open(io.BytesIO(data))   # frame 0 (8x8) passes the bomb check\nim.seek(1)                          # frame 1 (14000x14000) -\u003e NOT re-checked  \u003c-- bug\nim.load()                           # decodes the over-limit image, commits memory\nprint(\"loaded over-limit frame:\", im.size)\n```\n\nMeasured on Pillow 12.3.0 (default limit 89,478,485 px; error threshold 178,956,970 px):\n\n| Vector | File size | Frame 1 | Peak RSS |\n|---|---|---|---|\n| MPO (JPEG) | ~3.0 MB | 14000×14000 (196 Mpx) | ~763 MB |\n| DCX (PCX) | ~6.2 MB | 14000×14000 (196 Mpx) | ~200 MB |\n| Control: same image standalone | — | 196 Mpx | `DecompressionBombError` (correctly blocked) |\n\nThe DCX vector (`0x3ADE68B1` magic + offset directory + two PCX pages) behaves identically via `DcxImageFile.seek()`. Scaling frame 1 toward JPEG's ~65500×65500 maximum drives multi-GB commitments from a small file, reliably OOM-killing the process.\n\n### Impact\nDenial of service (memory exhaustion / OOM) — CWE-400 / CWE-1284, a bypass of Pillow's documented decompression-bomb mitigation. `seek()` + `load()` is the normal way to iterate frames (e.g. `PIL.ImageSequence.Iterator`, thumbnailers, converters, 3D-photo handlers). Because **MPO is auto-detected from a JPEG carrying MPF metadata**, a file served with a `.jpg` extension can be opened as MPO, so any application that iterates frames of untrusted images is exposed.\n\n### Suggested fix\nRe-run the check after `seek()` re-parses a frame, mirroring GIF/TIFF:\n\n```python\n# PIL/MpoImagePlugin.py — end of MpoImageFile.seek()\nself.tile = [ImageFile._Tile(\"jpeg\", (0, 0) + self.size, self.offset, self.tile[0][-1])]\nImage._decompression_bomb_check(self.size)   # add\nself.__frame = frame\n\n# PIL/DcxImagePlugin.py — end of DcxImageFile.seek()\nPcxImageFile._open(self)\nImage._decompression_bomb_check(self.size)   # add\n```","status":"published","published":"2026-10-22T15:56:37Z","modified":"2026-10-22T15:56:39Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-400","CWE-409"],"updated_at":"2026-11-02T14:41:34.690842Z"}],"nvd":[{"id":"CVE-2026-96636","description":"Pillow is a Python imaging library. Prior to 13.0.0, MpoImageFile.seek() and DcxImageFile.seek() reparse later MPO or DCX frames and replace self._size without rerunning Image._decompression_bomb_check(). A crafted multi-frame image can use a tiny first frame to pass Image.open() and then declare an over-limit later frame. Normal frame iteration through seek(), load(), or ImageSequence.Iterator can decode that frame and commit hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","status":"published","published":"2026-10-21T21:20:31.76Z","modified":"2026-10-30T17:17:32.103Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-400","CWE-409"],"updated_at":"2026-11-02T14:13:02.371082Z"}],"osv":[{"id":"CVE-2026-96636","title":"Pillow: Decompression-bomb protection bypass via multi-frame seek() in MPO and DCX (MpoImageFile.seek / DcxImageFile.seek)","description":"Pillow is a Python imaging library. Prior to 13.0.0, MpoImageFile.seek() and DcxImageFile.seek() reparse later MPO or DCX frames and replace self._size without rerunning Image._decompression_bomb_check(). A crafted multi-frame image can use a tiny first frame to pass Image.open() and then declare an over-limit later frame. Normal frame iteration through seek(), load(), or ImageSequence.Iterator can decode that frame and commit hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","status":"published","published":"2026-10-21T21:05:20.85Z","modified":"2026-11-12T12:27:19.166862277Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-400","CWE-409"],"updated_at":"2026-11-11T17:46:38.239173Z"},{"id":"DEBIAN-CVE-2026-96636","description":"Pillow is a Python imaging library. Prior to 13.0.0, MpoImageFile.seek() and DcxImageFile.seek() reparse later MPO or DCX frames and replace self._size without rerunning Image._decompression_bomb_check(). A crafted multi-frame image can use a tiny first frame to pass Image.open() and then declare an over-limit later frame. Normal frame iteration through seek(), load(), or ImageSequence.Iterator can decode that frame and commit hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","status":"published","published":"2026-10-21T21:20:31.76Z","modified":"2026-10-31T09:47:26.669596961Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:46:07.324252Z"},{"id":"GHSA-p8hx-v2p6-rp84","title":"Pillow: Decompression-bomb protection bypass via multi-frame seek() in MPO and DCX (MpoImageFile.seek / DcxImageFile.seek)","description":"### Summary\nPillow's decompression-bomb protection (`Image._decompression_bomb_check`, gated by `Image.MAX_IMAGE_PIXELS`) is enforced only on the **first frame**, inside `Image.open()`. For multi-frame formats, `seek()` re-parses the target frame's header and resets `self._size`. `GifImagePlugin` and `TiffImagePlugin` re-run the bomb check on `seek()`, but **`MpoImageFile.seek()` and `DcxImageFile.seek()` do not.** A crafted MPO or DCX whose first frame is tiny (passing the check) but whose later frame declares enormous dimensions therefore bypasses the protection: loading that frame decodes an over-limit image and commits large amounts of memory — a denial of service (memory exhaustion / OOM).\n\nSame class as the recently assigned CVE-2026-55379 (BdfFontFile), CVE-2026-55380 (GdImageFile) and CVE-2026-40192 (FITS GZIP).\n\n### Details\n`Image.open()` → `_open_core()` runs `_decompression_bomb_check(im.size)` once, on the frame present at open time. Both vulnerable `seek()` methods re-parse a new frame and set a new `self._size` without re-checking:\n\n- **`PIL/MpoImagePlugin.py`, `MpoImageFile.seek()`**: calls `JpegImagePlugin.JpegImageFile._open(self)` (which sets `self._size` from the frame's JPEG SOF) and rebuilds `self.tile`, with no `Image._decompression_bomb_check(self.size)`.\n- **`PIL/DcxImagePlugin.py`, `DcxImageFile.seek()`**: calls `PcxImageFile._open(self)` (which sets `self._size` from the page's PCX header), with no check.\n\nConfirmed present in **12.3.0** (latest release) and on **`main`** (13.0.0.dev0). Compare `GifImagePlugin._seek` and `TiffImagePlugin`, which call `_decompression_bomb_check` correctly on seek.\n\n### PoC\nSelf-contained; the victim uses **default** `MAX_IMAGE_PIXELS`:\n\n```python\nimport io\nfrom PIL import Image\n\n# attacker builds the file (guard disabled only to CREATE the oversized frame)\nImage.MAX_IMAGE_PIXELS = None\nsmall = Image.new(\"RGB\", (8, 8))\nbig   = Image.new(\"RGB\", (14000, 14000), (120, 60, 30))   # 196,000,000 px \u003e error threshold\nbuf = io.BytesIO()\nsmall.save(buf, format=\"MPO\", save_all=True, append_images=[big])\ndata = buf.getvalue()                                      # ~3 MB\nImage.MAX_IMAGE_PIXELS = int(1024 * 1024 * 1024 // 4 // 3) # restore default\n\n# victim (default limits)\nim = Image.open(io.BytesIO(data))   # frame 0 (8x8) passes the bomb check\nim.seek(1)                          # frame 1 (14000x14000) -\u003e NOT re-checked  \u003c-- bug\nim.load()                           # decodes the over-limit image, commits memory\nprint(\"loaded over-limit frame:\", im.size)\n```\n\nMeasured on Pillow 12.3.0 (default limit 89,478,485 px; error threshold 178,956,970 px):\n\n| Vector | File size | Frame 1 | Peak RSS |\n|---|---|---|---|\n| MPO (JPEG) | ~3.0 MB | 14000×14000 (196 Mpx) | ~763 MB |\n| DCX (PCX) | ~6.2 MB | 14000×14000 (196 Mpx) | ~200 MB |\n| Control: same image standalone | — | 196 Mpx | `DecompressionBombError` (correctly blocked) |\n\nThe DCX vector (`0x3ADE68B1` magic + offset directory + two PCX pages) behaves identically via `DcxImageFile.seek()`. Scaling frame 1 toward JPEG's ~65500×65500 maximum drives multi-GB commitments from a small file, reliably OOM-killing the process.\n\n### Impact\nDenial of service (memory exhaustion / OOM) — CWE-400 / CWE-1284, a bypass of Pillow's documented decompression-bomb mitigation. `seek()` + `load()` is the normal way to iterate frames (e.g. `PIL.ImageSequence.Iterator`, thumbnailers, converters, 3D-photo handlers). Because **MPO is auto-detected from a JPEG carrying MPF metadata**, a file served with a `.jpg` extension can be opened as MPO, so any application that iterates frames of untrusted images is exposed.\n\n### Suggested fix\nRe-run the check after `seek()` re-parses a frame, mirroring GIF/TIFF:\n\n```python\n# PIL/MpoImagePlugin.py — end of MpoImageFile.seek()\nself.tile = [ImageFile._Tile(\"jpeg\", (0, 0) + self.size, self.offset, self.tile[0][-1])]\nImage._decompression_bomb_check(self.size)   # add\nself.__frame = frame\n\n# PIL/DcxImagePlugin.py — end of DcxImageFile.seek()\nPcxImageFile._open(self)\nImage._decompression_bomb_check(self.size)   # add\n```","status":"published","published":"2026-10-22T15:56:37Z","modified":"2026-10-29T10:55:49.521326948Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-400","CWE-409"],"updated_at":"2026-11-02T15:46:52.891208Z"},{"id":"PYSEC-2026-4337","description":"Pillow is a Python imaging library. Prior to 13.0.0, MpoImageFile.seek() and DcxImageFile.seek() reparse later MPO or DCX frames and replace self._size without rerunning Image._decompression_bomb_check(). A crafted multi-frame image can use a tiny first frame to pass Image.open() and then declare an over-limit later frame. Normal frame iteration through seek(), load(), or ImageSequence.Iterator can decode that frame and commit hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","status":"published","published":"2026-10-21T21:20:31.76Z","modified":"2026-10-29T10:55:49.521326948Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:57.671918Z"},{"id":"UBUNTU-CVE-2026-96636","description":"Pillow is a Python imaging library. Prior to 13.0.0, MpoImageFile.seek() and DcxImageFile.seek() reparse later MPO or DCX frames and replace self._size without rerunning Image._decompression_bomb_check(). A crafted multi-frame image can use a tiny first frame to pass Image.open() and then declare an over-limit later frame. Normal frame iteration through seek(), load(), or ImageSequence.Iterator can decode that frame and commit hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","status":"published","published":"2026-10-21T21:20:00Z","modified":"2026-11-04T20:04:29.079955239Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-04T21:43:26.87909Z"},{"id":"BIT-pillow-2026-96636","title":"Pillow: Decompression-bomb protection bypass via multi-frame seek() in MPO and DCX (MpoImageFile.seek / DcxImageFile.seek)","description":"Pillow is a Python imaging library. Prior to 13.0.0, MpoImageFile.seek() and DcxImageFile.seek() reparse later MPO or DCX frames and replace self._size without rerunning Image._decompression_bomb_check(). A crafted multi-frame image can use a tiny first frame to pass Image.open() and then declare an over-limit later frame. Normal frame iteration through seek(), load(), or ImageSequence.Iterator can decode that frame and commit hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","status":"published","published":"2026-10-29T08:58:10.266Z","modified":"2026-10-29T10:55:49.521326948Z","updated_at":"2026-11-02T15:28:34.724063Z"},{"id":"CLSA-2026-1793025111","title":"TuxCare security update for pillow (3 CVEs)","description":"TuxCare rebuilt pillow to address 3 CVEs. Fixed in 11.3.0.post12+tuxcare.","status":"published","published":"2026-10-26T14:31:51Z","modified":"2026-10-27T01:45:03.425401243Z","updated_at":"2026-11-02T15:43:54.981307Z"},{"id":"CLSA-2026-1793085879","title":"TuxCare security update for pillow (9 CVEs)","description":"TuxCare rebuilt pillow to address 9 CVEs. Fixed in 11.2.1.post13+tuxcare.","status":"published","published":"2026-10-27T07:24:39Z","modified":"2026-10-27T13:30:19.34042906Z","updated_at":"2026-11-02T15:43:54.981307Z"},{"id":"CLSA-2026-1793099358","title":"TuxCare security update for pillow (8 CVEs)","description":"TuxCare rebuilt pillow to address 8 CVEs. Fixed in 10.4.0.post15+tuxcare.","status":"published","published":"2026-10-27T11:09:18Z","modified":"2026-10-27T13:30:19.345594865Z","updated_at":"2026-11-02T15:43:55.34846Z"},{"id":"CLSA-2026-1793346161","title":"TuxCare security update for pillow (7 CVEs)","description":"TuxCare rebuilt pillow to address 7 CVEs. Fixed in 9.5.0.post13+tuxcare.","status":"published","published":"2026-10-30T08:42:41Z","modified":"2026-10-30T13:30:11.642926727Z","updated_at":"2026-11-02T15:43:55.669514Z"},{"id":"openSUSE-SU-2026:12251-1","title":"python313-Pillow-13.0.0-2.1 on GA media","description":"These are all security issues fixed in the python313-Pillow-13.0.0-2.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-10-23T00:00:00Z","modified":"2026-10-24T17:23:09.361131687Z","updated_at":"2026-11-02T16:58:40.245664Z"},{"id":"openSUSE-SU-2026:22246-1","title":"Security update for python-Pillow","description":"This update for python-Pillow fixes the following issues:\n\n- CVE-2026-96636: decompression-bomb protection bypass via multi-frame `seek()` in MPO and DCX (bsc#1286802).\n- CVE-2026-96637: decompression bomb check bypass in `SpiderImagePlugin.seek()` leads to unbounded allocation DoS\n  (bsc#1286801).\n- CVE-2026-96638: BMP RLE decoder memory-amplification DoS via unbounded delta escape/absolute mode (bsc#1286800).\n- CVE-2026-96639: multi-frame loaders can reuse stale native image storage after mode transitions (bsc#1286799).\n- CVE-2026-96640: PDF append accepts malformed shared page-tree DAG, which can cause resource exhaustion (bsc#1286798).\n- CVE-2026-96641: reachable undefined behavior in native integer operations can lead to denial of service or logic\n  integrity compromise (bsc#1286797).\n- CVE-2026-96642: `TarIO` negative size field causes infinite CPU-spin loop (bsc#1286796).\n- CVE-2026-96643: PNG eXIf chunk makes EXIF parsing run in quadratic time (bsc#1286795).\n- CVE-2026-96778: heap buffer overflow writing JPEG comment after ICC profile fills buffer (bsc#1286793).\n- CVE-2026-112390: Denial of Service via infinite loop during crafted MIC image parsing (bsc#1286256).\n- CVE-2026-112391: Denial of Service via unbounded recursion in PDF parser (bsc#1286273).\n- CVE-2026-112392: Denial of Service via zero-size images in rank filters (bsc#1286287).\n- CVE-2026-112393: heap buffer overflow and stale-heap disclosure in _tiffWriteProc when saving compressed TIFF data\n  (bsc#1286325).\n- CVE-2026-112394: `P;2L` and `P;4L` decoders may read 1 to 3 bytes past the passed buffer size (bsc#1286311).\n- CVE-2026-112395: Pillow tiled-TIFF decoder reads past tile buffer in `copy4` (bsc#1286312).\n- CVE-2026-112396: heap use-after-free when encoding TIFF to an in-memory buffer (bsc#1286313).\n- CVE-2026-112397: out-of-bounds access in `_imagingmorph` on a zero-width image (bsc#1286314).\n- CVE-2026-112398: heap buffer overflow in FPX JPEG decoding can lead to code execution (bsc#1286406).\n- CVE-2026-112399: Denial of service via crafted APNG image (bsc#1286368).\n- CVE-2026-112400: Denial of Service via memory exhaustion from crafted GIF image (bsc#1286370).\n- CVE-2026-112401: Denial of Service via crafted GIF comments (bsc#1286372).\n- CVE-2026-112402: Denial of service via double free during image transformation (bsc#1286381).\n- CVE-2026-112403: heap buffer overflow in `ImagingJpegDecode` allows for code execution (bsc#1286405).\n- CVE-2026-112404: Denial of Service via out-of-bounds read in TIFF decoding (bsc#1286388).\n- CVE-2026-112405: NULL pointer dereference in `Image.merge` via an unvalidated band 0 (bsc#1286404).\n- CVE-2026-112406: infinite loop in `PdfParser.rewrite_pages` on page tree `Parent` cycle (bsc#1286403).\n- CVE-2026-112891: quadratic GIF comment copying during save (bsc#1286402).\n- CVE-2026-112892: MSP RLE decoder expands a tiny file into unbounded memory (bsc#1286401).\n- CVE-2026-112893: Denial of Service via invalid pointer free during font rendering (bsc#1286392).\n- CVE-2026-112894: Denial of Service via crafted multi-frame image conversion (bsc#1286408).\n- CVE-2026-112895: Denial of service via crafted PDF during append operations (bsc#1286411).\n- CVE-2026-112896: TIFF encoder `ColorMap` plane-size mismatch causes a heap out-of-bounds read (bsc#1286400).\n- CVE-2026-112897: `TiffDecode` returns uninitialized memory as pixels for short JPEG strips (bsc#1286398).\n- CVE-2026-112898: `Image.quantize()` with empty palette can leak uninitialized stack memory (bsc#1286399).\n- CVE-2026-112899: EPS `load(scale)` lets Ghostscript render past the decompression bomb limit (bsc#1286489).\n- CVE-2026-112900: argument Injection in Ghostscript call can lead to remote code execution (bsc#1286397).\n- CVE-2026-112901: ReDoS in `XbmImagePlugin` can be triggered by 512-byte file (bsc#1286396).\n- CVE-2026-112902: memory disclosure and segfault in libtiff encoder via crafted TIFF tags (bsc#1286804).\n- CVE-2026-114501: Arrow export leaks stale heap memory when `PILLOW_ALIGNMENT \u003e 1` (bsc#1286803).\n","status":"published","published":"2026-11-05T03:40:19Z","modified":"2026-11-11T17:23:13.17320283Z","updated_at":"2026-11-11T17:47:15.466074Z"},{"id":"SUSE-SU-2026:5038-1","title":"Security update for python-Pillow","description":"This update for python-Pillow fixes the following issues:\n\n- CVE-2026-96636: decompression-bomb protection bypass via multi-frame `seek()` in MPO and DCX (bsc#1286802).\n- CVE-2026-96637: decompression bomb check bypass in `SpiderImagePlugin.seek()` leads to unbounded allocation DoS\n  (bsc#1286801).\n- CVE-2026-96640: PDF append accepts malformed shared page-tree DAG, which can cause resource exhaustion (bsc#1286798).\n- CVE-2026-96641: reachable undefined behavior in native integer operations can lead to denial of service or logic\n  integrity compromise (bsc#1286797).\n- CVE-2026-96642: `TarIO` negative size field causes infinite CPU-spin loop (bsc#1286796).\n- CVE-2026-112390: Denial of Service via infinite loop during crafted MIC image parsing (bsc#1286256).\n- CVE-2026-112391: Denial of Service via unbounded recursion in PDF parser (bsc#1286273).\n- CVE-2026-112392: Denial of Service via zero-size images in rank filters (bsc#1286287).\n- CVE-2026-112393: heap buffer overflow and stale-heap disclosure in _tiffWriteProc when saving compressed TIFF data\n  (bsc#1286325).\n- CVE-2026-112394: `P;2L` and `P;4L` decoders may read 1 to 3 bytes past the passed buffer size (bsc#1286311).\n- CVE-2026-112397: out-of-bounds access in `_imagingmorph` on a zero-width image (bsc#1286314).\n- CVE-2026-112398: heap buffer overflow in FPX JPEG decoding can lead to code execution (bsc#1286406).\n- CVE-2026-112399: Denial of service via crafted APNG image (bsc#1286368).\n- CVE-2026-112400: Denial of Service via memory exhaustion from crafted GIF image (bsc#1286370).\n- CVE-2026-112401: Denial of Service via crafted GIF comments (bsc#1286372).\n- CVE-2026-112402: Denial of service via double free during image transformation (bsc#1286381).\n- CVE-2026-112403: heap buffer overflow in `ImagingJpegDecode` allows for code execution (bsc#1286405).\n- CVE-2026-112405: NULL pointer dereference in `Image.merge` via an unvalidated band 0 (bsc#1286404).\n- CVE-2026-112406: infinite loop in `PdfParser.rewrite_pages` on page tree `Parent` cycle (bsc#1286403).\n- CVE-2026-112891: quadratic GIF comment copying during save (bsc#1286402).\n- CVE-2026-112892: MSP RLE decoder expands a tiny file into unbounded memory (bsc#1286401).\n- CVE-2026-112894: Denial of Service via crafted multi-frame image conversion (bsc#1286408).\n- CVE-2026-112895: Denial of service via crafted PDF during append operations (bsc#1286411).\n- CVE-2026-112896: TIFF encoder `ColorMap` plane-size mismatch causes a heap out-of-bounds read (bsc#1286400).\n- CVE-2026-112897: `TiffDecode` returns uninitialized memory as pixels for short JPEG strips (bsc#1286398).\n- CVE-2026-112899: EPS `load(scale)` lets Ghostscript render past the decompression bomb limit (bsc#1286489).\n- CVE-2026-112900: argument Injection in Ghostscript call can lead to remote code execution (bsc#1286397).\n- CVE-2026-112901: ReDoS in `XbmImagePlugin` can be triggered by 512-byte file (bsc#1286396).\n- CVE-2026-112902: memory disclosure and segfault in libtiff encoder via crafted TIFF tags (bsc#1286804).\n","status":"published","published":"2026-11-02T16:22:03Z","modified":"2026-11-03T13:15:08.326276184Z","updated_at":"2026-11-03T13:33:04.521148Z"},{"id":"SUSE-SU-2026:5194-1","title":"Security update for python-Pillow","description":"This update for python-Pillow fixes the following issues:\n\n- CVE-2026-96636: decompression-bomb protection bypass via multi-frame `seek()` in MPO and DCX (bsc#1286802).\n- CVE-2026-96637: decompression bomb check bypass in `SpiderImagePlugin.seek()` leads to unbounded allocation DoS\n  (bsc#1286801).\n- CVE-2026-96638: BMP RLE decoder memory-amplification DoS via unbounded delta escape/absolute mode (bsc#1286800).\n- CVE-2026-96640: PDF append accepts malformed shared page-tree DAG, which can cause resource exhaustion (bsc#1286798).\n- CVE-2026-96641: reachable undefined behavior in native integer operations can lead to denial of service or logic\n  integrity compromise (bsc#1286797).\n- CVE-2026-96642: `TarIO` negative size field causes infinite CPU-spin loop (bsc#1286796).\n- CVE-2026-96778: heap buffer overflow writing JPEG comment after ICC profile fills buffer (bsc#1286793).\n- CVE-2026-112390: Denial of Service via infinite loop during crafted MIC image parsing (bsc#1286256).\n- CVE-2026-112391: Denial of Service via unbounded recursion in PDF parser (bsc#1286273).\n- CVE-2026-112392: Denial of Service via zero-size images in rank filters (bsc#1286287).\n- CVE-2026-112393: heap buffer overflow and stale-heap disclosure in _tiffWriteProc when saving compressed TIFF data\n  (bsc#1286325).\n- CVE-2026-112394: `P;2L` and `P;4L` decoders may read 1 to 3 bytes past the passed buffer size (bsc#1286311).\n- CVE-2026-112395: Pillow tiled-TIFF decoder reads past tile buffer in `copy4` (bsc#1286312).\n- CVE-2026-112397: out-of-bounds access in `_imagingmorph` on a zero-width image (bsc#1286314).\n- CVE-2026-112398: heap buffer overflow in FPX JPEG decoding can lead to code execution (bsc#1286406).\n- CVE-2026-112399: Denial of service via crafted APNG image (bsc#1286368).\n- CVE-2026-112400: Denial of Service via memory exhaustion from crafted GIF image (bsc#1286370).\n- CVE-2026-112401: Denial of Service via crafted GIF comments (bsc#1286372).\n- CVE-2026-112402: Denial of service via double free during image transformation (bsc#1286381).\n- CVE-2026-112403: heap buffer overflow in `ImagingJpegDecode` allows for code execution (bsc#1286405).\n- CVE-2026-112404: Denial of Service via out-of-bounds read in TIFF decoding (bsc#1286388).\n- CVE-2026-112405: NULL pointer dereference in `Image.merge` via an unvalidated band 0 (bsc#1286404).\n- CVE-2026-112406: infinite loop in `PdfParser.rewrite_pages` on page tree `Parent` cycle (bsc#1286403).\n- CVE-2026-112891: quadratic GIF comment copying during save (bsc#1286402).\n- CVE-2026-112892: MSP RLE decoder expands a tiny file into unbounded memory (bsc#1286401).\n- CVE-2026-112894: Denial of Service via crafted multi-frame image conversion (bsc#1286408).\n- CVE-2026-112895: Denial of service via crafted PDF during append operations (bsc#1286411).\n- CVE-2026-112896: TIFF encoder `ColorMap` plane-size mismatch causes a heap out-of-bounds read (bsc#1286400).\n- CVE-2026-112897: `TiffDecode` returns uninitialized memory as pixels for short JPEG strips (bsc#1286398).\n- CVE-2026-112898: `Image.quantize()` with empty palette can leak uninitialized stack memory (bsc#1286399).\n- CVE-2026-112899: EPS `load(scale)` lets Ghostscript render past the decompression bomb limit (bsc#1286489).\n- CVE-2026-112900: argument Injection in Ghostscript call can lead to remote code execution (bsc#1286397).\n- CVE-2026-112901: ReDoS in `XbmImagePlugin` can be triggered by 512-byte file (bsc#1286396).\n- CVE-2026-112902: memory disclosure and segfault in libtiff encoder via crafted TIFF tags (bsc#1286804).\n","status":"published","published":"2026-11-11T12:32:44Z","modified":"2026-11-12T12:15:04.868768368Z","updated_at":"2026-11-12T12:48:34.460153Z"}]}}