{"id":"CVE-2026-28804","aliases":["CLSA-2026-1789369936","DEBIAN-CVE-2026-28804","EUVD-2026-10010","GHSA-9m86-7pmv-2852","PYSEC-2026-3014","ROOT-APP-PYPI-CVE-2026-28804","UBUNTU-CVE-2026-28804","openSUSE-SU-2026:10321-1","openSUSE-SU-2026:20348-1"],"status":"published","title":"pypdf: Inefficient decoding of ASCIIHexDecode streams","description":"pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.","severity":{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00444,"percentile":0.38832,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-407"],"published":"2026-03-02T22:03:45Z","modified":"2026-11-04T02:47:32Z","fixes":[{"ecosystem":"PyPI","package":"pypdf","fixed_in":["6.7.5"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:14","package":"pypdf","fixed_in":["6.9.0-1"],"sources":["osv"]},{"ecosystem":"Root:PyPI","package":"pypdf","fixed_in":["6.6.0+aikido.7","6.6.0+aikido.8","6.6.0+aikido.9","6.6.0+aikido.10","6.6.0+aikido.11","6.6.0+aikido.12","6.6.0+aikido.13","6.6.0+aikido.14","6.6.0+aikido.15"],"sources":["osv"]},{"ecosystem":"Root:PyPI","package":"rootio-pypdf","fixed_in":["6.6.0+root.io.4","6.6.0+root.io.5","6.6.0+root.io.6","6.6.0+root.io.7","6.6.0+root.io.8","6.6.0+root.io.9","6.6.0+root.io.10","6.6.0+root.io.11"],"sources":["osv"]},{"ecosystem":"openSUSE:Tumbleweed","package":"python-PyPDF2","fixed_in":["2.11.1-6.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.7.5"}]}]},{"source":"osv","ecosystem":"TuxCare:PyPI","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.9.0"},{"fixed":"5.9.0.post17+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.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":7},{"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":"6.9.0-1"}]}],"versions":["5.4.0-1"]},{"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":"6.7.5"}]}],"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","6.2.0","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"]},{"source":"osv","ecosystem":"PyPI","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.7.5"}]}],"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","6.2.0","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"]},{"source":"osv","ecosystem":"Root:PyPI","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.0+aikido.7"},{"fixed":"6.6.0+aikido.8"},{"fixed":"6.6.0+aikido.9"},{"fixed":"6.6.0+aikido.10"},{"fixed":"6.6.0+aikido.11"},{"fixed":"6.6.0+aikido.12"},{"fixed":"6.6.0+aikido.13"},{"fixed":"6.6.0+aikido.14"},{"fixed":"6.6.0+aikido.15"}]}]},{"source":"osv","ecosystem":"Root:PyPI","package":"rootio-pypdf","range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Advisory","advisory","web","report"]},{"url":"https://github.com/py-pdf/pypdf/pull/3666","tags":["x_refsource_MISC","Issue Tracking","Patch","fix","web","report"]},{"url":"https://github.com/py-pdf/pypdf/commit/648c627d2657447dfb1773412af05a0a5103b98f","tags":["x_refsource_MISC","Patch","fix","web","report"]},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.7.5","tags":["x_refsource_MISC","Product","Release Notes","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-28804","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-9m86-7pmv-2852","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/28xxx/CVE-2026-28804.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-28804","tags":["advisory"]},{"url":"https://github.com/py-pdf/pypdf","tags":["package"]},{"url":"https://pypi.org/project/pypdf","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-28804","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-28804","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-28804","tags":["web"]},{"url":"https://bugzilla.suse.com/1259404","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-28804","title":"pypdf: Inefficient decoding of ASCIIHexDecode streams","description":"pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.","status":"published","published":"2026-03-06T06:46:28.89Z","modified":"2026-03-06T16:05:28.63Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T14:20:01.969981Z"}],"euvd":[{"id":"EUVD-2026-10010","description":"pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.","status":"published","published":"2026-03-06T06:46:28Z","modified":"2026-03-06T16:05:28Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T19:48:08.258323Z"}],"ghsa":[{"id":"GHSA-9m86-7pmv-2852","title":"pypdf vulnerable to inefficient decoding of ASCIIHexDecode streams","description":"### Impact\nAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the `/ASCIIHexDecode` filter.\n\n### Patches\nThis has been fixed in [pypdf==6.7.5](https://github.com/py-pdf/pypdf/releases/tag/6.7.5).\n\n### Workarounds\nIf you cannot upgrade yet, consider applying the changes from PR [#3666](https://github.com/py-pdf/pypdf/pull/3666).","status":"published","published":"2026-03-02T22:03:45Z","modified":"2026-03-06T21:56:41Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T14:39:32.329372Z"}],"nvd":[{"id":"CVE-2026-28804","description":"pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.","status":"published","published":"2026-03-06T07:16:01.22Z","modified":"2026-11-02T16:06:04.477Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"primary"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T20:51:29.978497Z"}],"osv":[{"id":"CVE-2026-28804","title":"pypdf: Inefficient decoding of ASCIIHexDecode streams","description":"pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.","status":"published","published":"2026-03-06T06:46:28.89Z","modified":"2026-11-04T02:47:32.973634755Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-407"],"updated_at":"2026-11-04T02:53:45.692342Z"},{"id":"DEBIAN-CVE-2026-28804","description":"pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.","status":"published","published":"2026-03-06T07:16:01.22Z","modified":"2026-11-03T10:00:36.514980338Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-03T10:27:58.933618Z"},{"id":"GHSA-9m86-7pmv-2852","title":"pypdf vulnerable to inefficient decoding of ASCIIHexDecode streams","description":"### Impact\nAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the `/ASCIIHexDecode` filter.\n\n### Patches\nThis has been fixed in [pypdf==6.7.5](https://github.com/py-pdf/pypdf/releases/tag/6.7.5).\n\n### Workarounds\nIf you cannot upgrade yet, consider applying the changes from PR [#3666](https://github.com/py-pdf/pypdf/pull/3666).","status":"published","published":"2026-03-02T22:03:45Z","modified":"2026-09-10T03:50:38.603469156Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-407"],"updated_at":"2026-11-02T15:46:43.875515Z"},{"id":"PYSEC-2026-3014","title":"pypdf vulnerable to inefficient decoding of ASCIIHexDecode streams","description":"### Impact\nAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the `/ASCIIHexDecode` filter.\n\n### Patches\nThis has been fixed in [pypdf==6.7.5](https://github.com/py-pdf/pypdf/releases/tag/6.7.5).\n\n### Workarounds\nIf you cannot upgrade yet, consider applying the changes from PR [#3666](https://github.com/py-pdf/pypdf/pull/3666).","status":"published","published":"2026-07-13T14:36:40.337454Z","modified":"2026-07-13T16:33:09.771479736Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T15:52:56.429374Z"},{"id":"UBUNTU-CVE-2026-28804","description":"pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter. This issue has been patched in version 6.7.5.","status":"published","published":"2026-03-06T07:16:00Z","modified":"2026-10-17T12:59:56.92693172Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"medium"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T16:56:08.726452Z"},{"id":"CLSA-2026-1789369936","title":"TuxCare security update for pypdf (8 CVEs)","description":"TuxCare rebuilt pypdf to address 8 CVEs. Fixed in 5.9.0.post17+tuxcare.","status":"published","published":"2026-09-14T07:12:16Z","modified":"2026-10-15T09:48:01.580143795Z","updated_at":"2026-11-02T15:43:47.938828Z"},{"id":"openSUSE-SU-2026:10321-1","title":"python311-PyPDF2-2.11.1-6.1 on GA media","description":"These are all security issues fixed in the python311-PyPDF2-2.11.1-6.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-03-10T00:00:00Z","modified":"2026-03-23T04:54:40.532493Z","updated_at":"2026-11-02T16:58:38.101535Z"},{"id":"openSUSE-SU-2026:20348-1","title":"Security update for python-PyPDF2","description":"This update for python-PyPDF2 fixes the following issues:\n\nChanges in python-PyPDF2:\n\n- CVE-2026-28804: Denial of Service via crafted PDF with ASCIIHexDecode filter (bsc#1259404)\n- Update sources with osc run download_files\n","status":"withdrawn","published":"2026-03-11T20:15:02Z","modified":"2026-08-27T14:00:09.400325168Z","updated_at":"2026-11-02T16:58:41.463445Z"},{"id":"ROOT-APP-PYPI-CVE-2026-28804","title":"CVE-2026-28804 in pypdf - Patched by Root","description":"Root has patched CVE-2026-28804 in the pypdf package for Root:PyPI. Multiple fixed versions available.","status":"published","published":"2026-08-14T15:32:01Z","modified":"2026-08-14T17:00:12.915333579Z","updated_at":"2026-11-02T15:53:27.940619Z"}]}}