{"id":"CVE-2026-113791","aliases":["CLSA-2026-1793015443","DEBIAN-CVE-2026-113791","EUVD-2026-107331","GHSA-cgf9-327m-v77c","UBUNTU-CVE-2026-113791","openSUSE-SU-2026:22188-1"],"status":"published","title":"pypdf: Possible large memory usage when parsing content streams","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF containing a content stream with many small operations, causing parsing to consume large amounts of memory. This issue is fixed in version 6.21.0.","severity":{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00321,"percentile":0.25448,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400","CWE-770"],"published":"2026-10-21T15:37:50Z","modified":"2026-11-06T10:05:32Z","fixes":[{"ecosystem":"PyPI","package":"pypdf","fixed_in":["6.21.0"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:14","package":"pypdf","fixed_in":["6.21.0-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.21.0"}]}]},{"source":"osv","ecosystem":"TuxCare:PyPI","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.9.0"},{"fixed":"5.9.0.post20+tuxcare"}]}],"versions":["5.9.0","5.9.0.post1+tuxcare","5.9.0.post10+tuxcare","5.9.0.post11+tuxcare","5.9.0.post12+tuxcare","5.9.0.post13+tuxcare","5.9.0.post14+tuxcare","5.9.0.post15+tuxcare","5.9.0.post16+tuxcare","5.9.0.post17+tuxcare","5.9.0.post18+tuxcare","5.9.0.post19+tuxcare","5.9.0.post2+tuxcare","5.9.0.post3+tuxcare","5.9.0.post4+tuxcare","5.9.0.post5+tuxcare","5.9.0.post6+tuxcare","5.9.0.post7+tuxcare","5.9.0.post8+tuxcare","5.9.0.post9+tuxcare"],"bundled":6},{"source":"osv","ecosystem":"Debian:12","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.17.4-1","3.4.1-1","3.4.1-1+deb12u1","4.0.0-1","4.0.0-1~exp1","4.0.1-1","4.0.2-1","4.1.0-1","4.2.0-1","4.3.1-1","5.4.0-1","6.19.0-1","6.21.0-1","6.21.1-1","6.21.4-1","6.9.0-1","6.9.2-1","6.9.2-2"]},{"source":"osv","ecosystem":"Debian:13","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.4.0-1","6.19.0-1","6.21.0-1","6.21.1-1","6.21.4-1","6.9.0-1","6.9.2-1","6.9.2-2"]},{"source":"osv","ecosystem":"Debian:14","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.21.0-1"}]}],"versions":["5.4.0-1","6.19.0-1","6.9.0-1","6.9.2-1","6.9.2-2"]},{"source":"osv","ecosystem":"Debian:12","package":"pypdf2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.12.1-3","2.12.1-3+deb12u1","2.12.1-4"]},{"source":"osv","ecosystem":"PyPI","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.21.0"}]}],"versions":["1.0","1.1","1.10","1.11","1.12","1.13","1.2","1.3","1.4","1.5","1.6","1.7","1.8","1.9","3.1.0","3.10.0","3.11.0","3.11.1","3.12.0","3.12.1","3.12.2","3.13.0","3.14.0","3.15.0","3.15.1","3.15.2","3.15.3","3.15.4","3.15.5","3.16.0","3.16.1","3.16.2","3.16.3","3.16.4","3.17.0","3.17.1","3.17.2","3.17.3","3.17.4","3.2.0","3.2.1","3.3.0","3.4.0","3.4.1","3.5.0","3.5.1","3.5.2","3.6.0","3.7.0","3.7.1","3.8.0","3.8.1","3.9.0","3.9.1","4.0.0","4.0.1","4.0.2","4.1.0","4.2.0","4.3.0","4.3.1","5.0.0","5.0.1","5.1.0","5.2.0","5.3.0","5.3.1","5.4.0","5.5.0","5.6.0","5.6.1","5.7.0","5.8.0","5.9.0","6.0.0","6.1.0","6.1.1","6.1.2","6.1.3","6.10.0","6.10.1","6.10.2","6.11.0","6.12.0","6.12.1","6.12.2","6.13.0","6.13.1","6.13.2","6.13.3","6.14.0","6.14.1","6.14.2","6.15.0","6.16.0","6.16.1","6.16.2","6.17.0","6.18.0","6.18.1","6.19.0","6.2.0","6.20.0","6.20.1","6.3.0","6.4.0","6.4.1","6.4.2","6.5.0","6.6.0","6.6.1","6.6.2","6.7.0","6.7.1","6.7.2","6.7.3","6.7.4","6.7.5","6.8.0","6.9.0","6.9.1","6.9.2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"pypdf2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.23+git20141008-1","1.25.1-1","1.25.1-1ubuntu0.1~esm1","1.25.1-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"pypdf2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.26.0-2","1.26.0-2ubuntu0.1~esm1","1.26.0-2ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"pypdf2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.26.0-2","1.26.0-3ubuntu1","1.26.0-3ubuntu1.20.04.1","1.26.0-3ubuntu1.20.04.2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"pypdf2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.26.0-4","1.26.0-4ubuntu0.22.04.1","1.26.0-4ubuntu0.22.04.2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4.1-1","3.17.4-1","4.0.0-1","4.0.1-1","4.0.2-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"pypdf2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.12.1-3","2.12.1-4"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.9.2-1","6.9.2-2"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.4.0-1","6.9.2-1"]},{"source":"osv","ecosystem":"openSUSE:Leap 16.0","package":"python-pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.19.0-bp160.2.1"}]}],"bundled":8}],"products":[{"vendor":"py-pdf","product":"pypdf"}],"references":[{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-cgf9-327m-v77c","tags":["x_refsource_CONFIRM","Vendor Advisory","Patch","advisory","web","report"]},{"url":"https://github.com/py-pdf/pypdf/pull/4218","tags":["x_refsource_MISC","Issue Tracking","Patch","fix","web","report"]},{"url":"https://github.com/py-pdf/pypdf/commit/18bd2981a74479483a0b9507602c58a63d6c9b12","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.21.0","tags":["x_refsource_MISC","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-113791","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-cgf9-327m-v77c"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/113xxx/CVE-2026-113791.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-113791","tags":["advisory"]},{"url":"https://github.com/py-pdf/pypdf","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-113791","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-113791","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1286632","tags":["report"]},{"url":"https://bugzilla.suse.com/1286633","tags":["report"]},{"url":"https://bugzilla.suse.com/1286634","tags":["report"]},{"url":"https://bugzilla.suse.com/1286635","tags":["report"]},{"url":"https://bugzilla.suse.com/1286636","tags":["report"]},{"url":"https://bugzilla.suse.com/1286637","tags":["report"]},{"url":"https://bugzilla.suse.com/1286638","tags":["report"]},{"url":"https://bugzilla.suse.com/1286639","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-113786","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-113789","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-113790","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-113791","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-113792","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-113793","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-113794","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-113795","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-113791","title":"pypdf: Possible large memory usage when parsing content streams","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF containing a content stream with many small operations, causing parsing to consume large amounts of memory. This issue is fixed in version 6.21.0.","status":"published","published":"2026-10-21T15:37:50.527Z","modified":"2026-10-30T15:57:39.88Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-400","CWE-770"],"updated_at":"2026-11-02T13:44:29.519518Z"}],"euvd":[{"id":"EUVD-2026-107331","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF containing a content stream with many small operations, causing parsing to consume large amounts of memory. This issue is fixed in version 6.21.0.","status":"published","published":"2026-10-21T15:37:50Z","modified":"2026-10-30T15:57:39Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T16:59:05.913237Z"}],"ghsa":[{"id":"GHSA-cgf9-327m-v77c","title":"pypdf: Possible large memory usage when parsing content streams","description":"### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing content streams with many small operations.\n\n### Patches\n\nThis has been fixed in [pypdf==6.21.0](https://github.com/py-pdf/pypdf/releases/tag/6.21.0).\n\n### Workarounds\n\nIf you cannot upgrade yet, consider applying the changes from PR [#4218](https://github.com/py-pdf/pypdf/pull/4218).","status":"published","published":"2026-10-22T16:49:22Z","modified":"2026-10-22T16:49:24Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-400","CWE-770"],"updated_at":"2026-11-02T14:41:35.723785Z"}],"nvd":[{"id":"CVE-2026-113791","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF containing a content stream with many small operations, causing parsing to consume large amounts of memory. This issue is fixed in version 6.21.0.","status":"published","published":"2026-10-21T16:17:27.027Z","modified":"2026-11-05T21:33:03.837Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","level":"low","assessor":"primary"}],"cwes":["CWE-400","CWE-770"],"updated_at":"2026-11-05T23:57:21.427431Z"}],"osv":[{"id":"CVE-2026-113791","title":"pypdf: Possible large memory usage when parsing content streams","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF containing a content stream with many small operations, causing parsing to consume large amounts of memory. This issue is fixed in version 6.21.0.","status":"published","published":"2026-10-21T15:37:50.527Z","modified":"2026-11-07T02:48:26.784797512Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-400","CWE-770"],"updated_at":"2026-11-07T03:08:00.742665Z"},{"id":"DEBIAN-CVE-2026-113791","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF containing a content stream with many small operations, causing parsing to consume large amounts of memory. This issue is fixed in version 6.21.0.","status":"published","published":"2026-10-21T16:17:27.027Z","modified":"2026-11-06T10:05:32.810500961Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-06T10:38:22.758306Z"},{"id":"GHSA-cgf9-327m-v77c","title":"pypdf: Possible large memory usage when parsing content streams","description":"### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing content streams with many small operations.\n\n### Patches\n\nThis has been fixed in [pypdf==6.21.0](https://github.com/py-pdf/pypdf/releases/tag/6.21.0).\n\n### Workarounds\n\nIf you cannot upgrade yet, consider applying the changes from PR [#4218](https://github.com/py-pdf/pypdf/pull/4218).","status":"published","published":"2026-10-22T16:49:22Z","modified":"2026-10-22T17:00:04.215115256Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-400","CWE-770"],"updated_at":"2026-11-02T15:46:44.927642Z"},{"id":"UBUNTU-CVE-2026-113791","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.21.0, an attacker can craft a PDF containing a content stream with many small operations, causing parsing to consume large amounts of memory. This issue is fixed in version 6.21.0.","status":"published","published":"2026-10-21T16:17:00Z","modified":"2026-11-07T01:45:03.608397599Z","cvss":[{"version":"4.0","score":6,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-07T01:57:16.198641Z"},{"id":"CLSA-2026-1793015443","title":"TuxCare security update for pypdf (6 CVEs)","description":"TuxCare rebuilt pypdf to address 6 CVEs. Fixed in 5.9.0.post20+tuxcare.","status":"published","published":"2026-10-26T11:50:43Z","modified":"2026-10-26T13:30:17.630779868Z","updated_at":"2026-11-02T15:43:54.981307Z"},{"id":"openSUSE-SU-2026:22188-1","title":"Security update for python-pypdf","description":"This update for python-pypdf fixes the following issues:\n\nChanges in python-pypdf:\n\n- CVE-2026-113786: PDF containing image data labeled with the\n  `/DCTDecode` filter causes Pillow to select and invoke an\n  unintended image parser when the image is loaded (bsc#1286632)\n- CVE-2026-113789: crafted PDF causes large memory usage or long\n  runtimes when an application retrieves the document's form fields\n  (bsc#1286633)\n- CVE-2026-113790: PDF containing arrays or dictionaries with many\n  elements causes parsing to consume large amounts of memory\n  (bsc#1286634)\n- CVE-2026-113791: PDF containing a content stream with many small\n  operations causes parsing to consume large amounts of memory\n  (bsc#1286635)\n- CVE-2026-113792: calling `PdfWriter.find_outline_item` on a\n  crafted PDF with a cyclic outline hierarchy can enter an infinite\n  loop and block the current process (bsc#1286636)\n- CVE-2026-113793: removing an object from a crafted cyclic PDF\n  tree can enter an infinite loop and block the current process\n  (bsc#1286637)\n- CVE-2026-113794: incomplete PDF that ends inside a standard\n  cross-reference table causes pypdf to mishandle the unexpected\n  end of file and enter an infinite loop (bsc#1286638)\n- CVE-2026-113795: accessing a crafted PDF stream with a large\n  number of filters or multiple filters that pass around large\n  amounts of data can cause large memory consumption (bsc#1286639)\n","status":"published","published":"2026-10-26T15:02:57Z","modified":"2026-11-01T17:23:29.513373666Z","updated_at":"2026-11-02T16:58:42.426393Z"}]}}