{"id":"CVE-2026-96638","aliases":["BIT-pillow-2026-96638","CLSA-2026-1793017750","CLSA-2026-1793085879","CLSA-2026-1793099358","CLSA-2026-1793598712","DEBIAN-CVE-2026-96638","EUVD-2026-107559","GHSA-24rc-8hj2-v98c","OESA-2026-4739","OESA-2026-4740","SUSE-SU-2026:5194-1","UBUNTU-CVE-2026-96638","openSUSE-SU-2026:12251-1","openSUSE-SU-2026:22246-1"],"status":"published","title":"Pillow: BMP RLE decoder memory-amplification DoS via unbounded delta escape / absolute mode","description":"Pillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to 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":"2026-11-12","score":0.00345,"percentile":0.28395,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400","CWE-770"],"published":"2026-10-21T20:47:21Z","modified":"2026-11-12T12:27:18Z","fixes":[{"ecosystem":"PyPI","package":"pillow","fixed_in":["13.0.0"],"sources":["ghsa","osv"]},{"ecosystem":"Bitnami","package":"pillow","fixed_in":["13.0.0"],"sources":["osv"]},{"ecosystem":"TuxCare:PyPI","package":"pillow","fixed_in":["9.5.0.post15+tuxcare"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"9.1.0"},{"fixed":"13.0.0"}]}]},{"source":"osv","ecosystem":"Bitnami","package":"pillow","ranges":[{"type":"SEMVER","events":[{"introduced":"9.1.0"},{"fixed":"13.0.0"}]}]},{"source":"osv","ecosystem":"TuxCare:PyPI","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"11.3.0"},{"fixed":"11.3.0.post11+tuxcare"}]}],"versions":["11.3.0","11.3.0.post1+tuxcare","11.3.0.post10+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":9},{"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.post15+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.post13+tuxcare","9.5.0.post14+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"]},{"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":"9.1.0"},{"fixed":"13.0.0"}]}],"versions":["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","9.1.0","9.1.1","9.2.0","9.3.0","9.4.0","9.5.0"]},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP1","package":"python-pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.3.0-15.oe2403sp1"}]}],"bundled":2},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP4","package":"python-pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"10.3.0-15.oe2403sp4"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Module for Python 3 15 SP7","package":"python-Pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.5.0-150400.5.28.1"}]}],"bundled":34},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS","package":"python-Pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.5.0-150400.5.28.1"}]}],"bundled":34},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS","package":"python-Pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.5.0-150400.5.28.1"}]}],"bundled":34},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS","package":"python-Pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.5.0-150400.5.28.1"}]}],"bundled":34},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS","package":"python-Pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.5.0-150400.5.28.1"}]}],"bundled":34},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 15 SP4-LTSS","package":"python-Pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.5.0-150400.5.28.1"}]}],"bundled":34},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 15 SP5-LTSS","package":"python-Pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.5.0-150400.5.28.1"}]}],"bundled":34},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 15 SP6-LTSS","package":"python-Pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.5.0-150400.5.28.1"}]}],"bundled":34},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP4","package":"python-Pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.5.0-150400.5.28.1"}]}],"bundled":34},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP5","package":"python-Pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.5.0-150400.5.28.1"}]}],"bundled":34},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP6","package":"python-Pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"9.5.0-150400.5.28.1"}]}],"bundled":34},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"pillow-python2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.2.1-3~build1","6.2.1-3","6.2.1-3ubuntu0.1~esm1","6.2.1-3ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["10.0.0-1","10.1.0-1","10.2.0-1","10.2.0-1build1","10.2.0-1ubuntu1","10.2.0-1ubuntu1.2","10.2.0-1ubuntu1.3","10.2.0-1ubuntu1.4"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["12.1.1-2ubuntu1","12.3.0-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["11.3.0-1ubuntu1","11.3.0-1ubuntu2","12.0.0-1ubuntu1","12.1.1-1ubuntu1","12.1.1-2ubuntu1","12.1.1-2ubuntu1.1","12.1.1-2ubuntu1.2","12.1.1-2ubuntu1.3","12.1.1-2ubuntu1.4"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"python-Pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"13.0.0-2.1"}]}],"bundled":6},{"source":"osv","ecosystem":"openSUSE:Leap 16.0","package":"python-Pillow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"11.3.0-160000.9.1"}]}],"bundled":39}],"products":[{"vendor":"python","product":"pillow"},{"vendor":"python-pillow","product":"pillow"}],"references":[{"url":"https://github.com/python-pillow/Pillow/security/advisories/GHSA-24rc-8hj2-v98c","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web","report"]},{"url":"https://github.com/python-pillow/Pillow/pull/10015","tags":["x_refsource_MISC","Issue Tracking","report","fix","web"]},{"url":"https://github.com/python-pillow/Pillow/commit/e7794835e323ff2691d9b3a974cade1a44301b9a","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/python-pillow/Pillow/releases/tag/13.0.0","tags":["x_refsource_MISC","Release Notes","article","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96638","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-24rc-8hj2-v98c"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/96xxx/CVE-2026-96638.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-96638","tags":["advisory"]},{"url":"https://github.com/python-pillow/Pillow","tags":["package"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4739","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112893","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4740","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112898","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20265194-1/","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/1286312","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/1286388","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/1286399","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/1286793","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/1286800","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-2026-112395","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-2026-112404","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-2026-112898","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-2026-96638","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/security/cve/CVE-2026-96778","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2026-96638","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-96638","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-2026-96638","title":"Pillow: BMP RLE decoder memory-amplification DoS via unbounded delta escape / absolute mode","description":"Pillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","status":"published","published":"2026-10-21T20:47:21.767Z","modified":"2026-10-28T18:21:53.7Z","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-770"],"updated_at":"2026-11-02T14:20:00.879257Z"}],"euvd":[{"id":"EUVD-2026-107559","description":"Pillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","status":"published","published":"2026-10-21T20:47:21Z","modified":"2026-10-28T18:21:53Z","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":"2026-11-02T16:59:19.203779Z"}],"ghsa":[{"id":"GHSA-24rc-8hj2-v98c","title":"Pillow: BMP RLE decoder memory-amplification DoS via unbounded delta escape / absolute mode","description":"## Summary\nBmpRleDecoder can be forced to allocate gigabytes of memory from a kilobyte-sized crafted BMP file via unbounded growth in the delta escape and absolute mode branches.\n\n## Affected versions\nAll versions up to and including current HEAD (v13.0.0.dev0, commit e7a7ea84)\n\n## Root cause\nBmpRleDecoder.decode() (BmpImagePlugin.py:327-395) builds a Python bytearray `data` with dest_length = xsize*ysize, looping `while len(data) \u003c dest_length`. The loop condition is only checked at the TOP; individual branches append attacker-controlled amounts UNBOUNDED by dest_length:\n\n- delta escape (line 370): data += b\"\\x00\" * (right + up * self.state.xsize) with right,up in 0..255 -\u003e up to ~255*xsize bytes in ONE iteration.\n- absolute mode (line 385): data += bytes_read (up to 255).\n\nBecause a single delta can push len(data) to ~256 * (row size), a tiny RLE stream combined with a large-but-legal xsize (xsize*ysize just under MAX_IMAGE_PIXELS, ~89M) yields a multi-GB `data` bytearray (then copied again by bytes(data) and set_as_raw). No heap OOB (bytearray/set_as_raw are bounds-safe), but a severe memory-amplification DoS: the attacker file stays tiny.\n\n## Reproduction\nPython 3.13, Pillow HEAD e7a7ea84\n\nAttached: pillow_poc_bmp_rle_dos.py\n\nA 1084-byte BMP (BI_RLE8, width=3,000,000, height=1 -\u003e 3M px, passes bomb check) with one delta escape (00 02 00 150) produces ~429 MB `data`; measured peak RSS 911 MB. Scaling width toward the bomb limit and up=255 produces tens of GB from a ~1 KB file.\n\n## Suggested fix\nCap growth at dest_length in the delta and absolute branches, e.g. clamp the delta fill to (dest_length - len(data)) and stop appending once len(data) \u003e= dest_length; reject deltas that would move the cursor beyond the image, matching the existing per-row clamp at line 341-343.\n\nCredit: Yazan Balawneh - CyStack Security Team (GitHub: sonicnew)\n\n[pillow_poc_bmp_rle_dos.py](https://github.com/user-attachments/files/30244974/pillow_poc_bmp_rle_dos.py)","status":"published","published":"2026-10-22T15:59:35Z","modified":"2026-10-22T15:59:36Z","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-770"],"updated_at":"2026-11-02T14:41:34.690842Z"}],"nvd":[{"id":"CVE-2026-96638","description":"Pillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","status":"published","published":"2026-10-21T21:20:32.067Z","modified":"2026-10-28T19:19:28.497Z","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-770"],"updated_at":"2026-11-02T14:13:02.371082Z"}],"osv":[{"id":"CVE-2026-96638","title":"Pillow: BMP RLE decoder memory-amplification DoS via unbounded delta escape / absolute mode","description":"Pillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","status":"published","published":"2026-10-21T20:47:21.767Z","modified":"2026-11-12T12:27:18.962730423Z","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-770"],"updated_at":"2026-11-11T17:46:38.239173Z"},{"id":"DEBIAN-CVE-2026-96638","description":"Pillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","status":"published","published":"2026-10-21T21:20:32.067Z","modified":"2026-10-29T09:47:28.773494156Z","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-24rc-8hj2-v98c","title":"Pillow: BMP RLE decoder memory-amplification DoS via unbounded delta escape / absolute mode","description":"## Summary\nBmpRleDecoder can be forced to allocate gigabytes of memory from a kilobyte-sized crafted BMP file via unbounded growth in the delta escape and absolute mode branches.\n\n## Affected versions\nAll versions up to and including current HEAD (v13.0.0.dev0, commit e7a7ea84)\n\n## Root cause\nBmpRleDecoder.decode() (BmpImagePlugin.py:327-395) builds a Python bytearray `data` with dest_length = xsize*ysize, looping `while len(data) \u003c dest_length`. The loop condition is only checked at the TOP; individual branches append attacker-controlled amounts UNBOUNDED by dest_length:\n\n- delta escape (line 370): data += b\"\\x00\" * (right + up * self.state.xsize) with right,up in 0..255 -\u003e up to ~255*xsize bytes in ONE iteration.\n- absolute mode (line 385): data += bytes_read (up to 255).\n\nBecause a single delta can push len(data) to ~256 * (row size), a tiny RLE stream combined with a large-but-legal xsize (xsize*ysize just under MAX_IMAGE_PIXELS, ~89M) yields a multi-GB `data` bytearray (then copied again by bytes(data) and set_as_raw). No heap OOB (bytearray/set_as_raw are bounds-safe), but a severe memory-amplification DoS: the attacker file stays tiny.\n\n## Reproduction\nPython 3.13, Pillow HEAD e7a7ea84\n\nAttached: pillow_poc_bmp_rle_dos.py\n\nA 1084-byte BMP (BI_RLE8, width=3,000,000, height=1 -\u003e 3M px, passes bomb check) with one delta escape (00 02 00 150) produces ~429 MB `data`; measured peak RSS 911 MB. Scaling width toward the bomb limit and up=255 produces tens of GB from a ~1 KB file.\n\n## Suggested fix\nCap growth at dest_length in the delta and absolute branches, e.g. clamp the delta fill to (dest_length - len(data)) and stop appending once len(data) \u003e= dest_length; reject deltas that would move the cursor beyond the image, matching the existing per-row clamp at line 341-343.\n\nCredit: Yazan Balawneh - CyStack Security Team (GitHub: sonicnew)\n\n[pillow_poc_bmp_rle_dos.py](https://github.com/user-attachments/files/30244974/pillow_poc_bmp_rle_dos.py)","status":"published","published":"2026-10-22T15:59:35Z","modified":"2026-10-29T10:55:36.26290207Z","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-770"],"updated_at":"2026-11-02T15:46:33.956911Z"},{"id":"OESA-2026-4739","title":"python-pillow security update","description":"Pillow is the friendly PIL fork by Alex Clark and Contributors. PIL is the Python Imaging \\ Library by Fredrik Lundh and Contributors. As of 2019, Pillow development is supported by Tidelift.    of CVE-2022-22815,CVE-2022-22816)\r\n\r\nSecurity Fix(es):\n\nPillow is a Python imaging library. From 10.0.0 until 13.0.0, Pillow can free an invalid glyph pointer during FreeType rendering with an active stroker. If FT_Load_Glyph fails, cleanup may call FT_Done_Glyph on an uninitialized or stale glyph variable. An attacker can supply a malformed font as untrusted bytes to an application that draws text with a nonzero stroke width, forcing the glyph-load failure path. This can corrupt memory or crash the process. This issue is fixed in version 13.0.0.(CVE-2026-112893)\n\nPillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.(CVE-2026-96638)","status":"published","published":"2026-11-11T12:25:42Z","modified":"2026-11-11T12:45:10.306916557Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-11T13:08:46.301371Z"},{"id":"OESA-2026-4740","title":"python-pillow security update","description":"Pillow is the friendly PIL fork by Alex Clark and Contributors. PIL is the Python Imaging \\ Library by Fredrik Lundh and Contributors. As of 2019, Pillow development is supported by Tidelift.    of CVE-2022-22815,CVE-2022-22816)\r\n\r\nSecurity Fix(es):\n\nPillow is a Python imaging library. From 9.1.0 until 13.0.0, Pillow can disclose uninitialized stack memory when Image.quantize() uses an empty palette. ImagingPaletteCacheUpdate() leaves a local cache array uninitialized when the palette has zero entries, and the conversion path emits those bytes as output pixel indices. An attacker who controls the palette image can obtain stack contents from a returned PNG or GIF. This can disclose addresses and stack-canary data without an out-of-bounds access, memory corruption, or process crash. This issue is fixed in version 13.0.0.(CVE-2026-112898)\n\nPillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.(CVE-2026-96638)","status":"published","published":"2026-11-11T12:25:42Z","modified":"2026-11-11T12:45:03.223999713Z","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":"2026-11-11T13:08:46.301371Z"},{"id":"UBUNTU-CVE-2026-96638","description":"Pillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to 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":"2026-11-04T20:03:01.658208113Z","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":"2026-11-04T21:44:40.383812Z"},{"id":"BIT-pillow-2026-96638","title":"Pillow: BMP RLE decoder memory-amplification DoS via unbounded delta escape / absolute mode","description":"Pillow is a Python imaging library. From 9.1.0 until 13.0.0, BmpRleDecoder.decode() in src/PIL/BmpImagePlugin.py permits crafted RLE BMP delta escapes and absolute-mode runs to append beyond the remaining dest_length without a per-branch cap. A delta can add roughly 255 image rows in one iteration, so a kilobyte-sized file with a large but permitted width can expand the data bytearray to hundreds of megabytes or more, causing memory-exhaustion denial of service. This issue is fixed in version 13.0.0.","status":"published","published":"2026-10-29T08:58:12.979Z","modified":"2026-10-29T10:55:36.26290207Z","updated_at":"2026-11-02T15:28:34.724063Z"},{"id":"CLSA-2026-1793017750","title":"TuxCare security update for pillow (9 CVEs)","description":"TuxCare rebuilt pillow to address 9 CVEs. Fixed in 11.3.0.post11+tuxcare.","status":"published","published":"2026-10-26T12:29:10Z","modified":"2026-10-27T01:45:02.436944916Z","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-2026-1793598712","title":"TuxCare security update for pillow (1 CVE)","description":"TuxCare rebuilt pillow to address 1 CVE. Fixed in 9.5.0.post15+tuxcare.","status":"published","published":"2026-11-02T06:51:53Z","modified":"2026-11-02T14:45:05.112686163Z","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-2026:5194-1","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"}]}}