{"id":"CVE-2026-31826","aliases":["CLSA-2026-1786946462","DEBIAN-CVE-2026-31826","EUVD-2026-10924","GHSA-hqmh-ppp3-xvm7","GHSA-x284-j5p8-9c5p","PYSEC-2026-3019","ROOT-APP-PYPI-CVE-2026-31826","UBUNTU-CVE-2026-31826","openSUSE-SU-2026:10332-1","openSUSE-SU-2026:10334-1","openSUSE-SU-2026:20375-1"],"status":"published","title":"pypdf: manipulated stream length values can exhaust RAM","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. This vulnerability is fixed in 6.8.0.","severity":{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/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":0.002,"percentile":0.10023,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-770"],"published":"2026-03-10T21:36:52Z","modified":"2026-11-04T02:47:33Z","fixes":[{"ecosystem":"PyPI","package":"pypdf","fixed_in":["6.8.0"],"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.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":["2.11.1-7.1"],"sources":["osv"]},{"ecosystem":"openSUSE:Tumbleweed","package":"python-pypdf","fixed_in":["6.8.0-1.1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.8.0"}]}]},{"source":"osv","ecosystem":"TuxCare:PyPI","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.9.0"},{"fixed":"5.9.0.post12+tuxcare"}]}],"versions":["5.9.0","5.9.0.post1+tuxcare","5.9.0.post10+tuxcare","5.9.0.post11+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":5},{"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":"6.8.0"}]}],"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","6.2.0","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","6.7.5"]},{"source":"osv","ecosystem":"PyPI","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.8.0"}]}],"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","6.2.0","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","6.7.5"]},{"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","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.0+root.io.5"},{"fixed":"6.6.0+root.io.6"},{"fixed":"6.6.0+root.io.7"},{"fixed":"6.6.0+root.io.8"},{"fixed":"6.6.0+root.io.9"},{"fixed":"6.6.0+root.io.10"},{"fixed":"6.6.0+root.io.11"}]}]},{"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:25.10","package":"pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.3.1-1","5.4.0-1"]},{"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:Tumbleweed","package":"python-PyPDF2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.11.1-7.1"}]}]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"python-pypdf","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.8.0-1.1"}]}]}],"products":[{"vendor":"py-pdf","product":"pypdf"}],"references":[{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-hqmh-ppp3-xvm7","tags":["x_refsource_CONFIRM","Patch","Vendor Advisory","advisory","web"]},{"url":"https://github.com/py-pdf/pypdf/pull/3675","tags":["x_refsource_MISC","Issue Tracking","Patch","fix","web"]},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.8.0","tags":["x_refsource_MISC","Product","Release Notes","web"]},{"url":"https://github.com/py-pdf/pypdf/commit/3c550b3196adeba1506a26e57c09c09fac75e9aa","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31826","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-hqmh-ppp3-xvm7","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31826.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-31826","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-2026-31826","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-31826","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-31826","tags":["web"]},{"url":"https://bugzilla.suse.com/1259508","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-31826","title":"pypdf: manipulated stream length values can exhaust RAM","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. This vulnerability is fixed in 6.8.0.","status":"published","published":"2026-03-10T21:36:52.186Z","modified":"2026-03-11T15:59:26.902Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:19:50.92611Z"}],"euvd":[{"id":"EUVD-2026-10924","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. This vulnerability is fixed in 6.8.0.","status":"published","published":"2026-03-10T21:36:52Z","modified":"2026-03-11T15:59:26Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T19:25:37.250097Z"}],"ghsa":[{"id":"GHSA-hqmh-ppp3-xvm7","title":"pypdf: manipulated stream length values can exhaust RAM","description":"### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large `/Length` value, regardless of the actual data length inside the stream.\n\n### Patches\nThis has been fixed in [pypdf==6.8.0](https://github.com/py-pdf/pypdf/releases/tag/6.8.0).\n\n### Workarounds\nIf you cannot upgrade yet, consider applying the changes from PR [#3675](https://github.com/py-pdf/pypdf/pull/3675).\n\nAs far as we are aware, this mostly affects reading from buffers of unknown size, as returned by `open(\"file.pdf\", mode=\"rb\")` for example. Passing a file path or a `BytesIO` buffer to *pypdf* instead does not seem to trigger the vulnerability.","status":"published","published":"2026-03-11T00:14:02Z","modified":"2026-03-11T05:46:58Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:39:34.616253Z"}],"nvd":[{"id":"CVE-2026-31826","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. This vulnerability is fixed in 6.8.0.","status":"published","published":"2026-03-10T22:16:20.483Z","modified":"2026-11-02T16:06:04.477Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/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":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T20:51:29.978497Z"}],"osv":[{"id":"CVE-2026-31826","title":"pypdf: manipulated stream length values can exhaust RAM","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. This vulnerability is fixed in 6.8.0.","status":"published","published":"2026-03-10T21:36:52.186Z","modified":"2026-11-04T02:47:33.382701619Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-770"],"updated_at":"2026-11-04T02:53:45.692342Z"},{"id":"DEBIAN-CVE-2026-31826","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. This vulnerability is fixed in 6.8.0.","status":"published","published":"2026-03-10T22:16:20.483Z","modified":"2026-11-03T10:00:26.289447565Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-03T10:27:58.933618Z"},{"id":"GHSA-hqmh-ppp3-xvm7","title":"pypdf: manipulated stream length values can exhaust RAM","description":"### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large `/Length` value, regardless of the actual data length inside the stream.\n\n### Patches\nThis has been fixed in [pypdf==6.8.0](https://github.com/py-pdf/pypdf/releases/tag/6.8.0).\n\n### Workarounds\nIf you cannot upgrade yet, consider applying the changes from PR [#3675](https://github.com/py-pdf/pypdf/pull/3675).\n\nAs far as we are aware, this mostly affects reading from buffers of unknown size, as returned by `open(\"file.pdf\", mode=\"rb\")` for example. Passing a file path or a `BytesIO` buffer to *pypdf* instead does not seem to trigger the vulnerability.","status":"published","published":"2026-03-11T00:14:02Z","modified":"2026-09-10T03:50:39.503255117Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:46:49.621585Z"},{"id":"PYSEC-2026-3019","title":"pypdf: manipulated stream length values can exhaust RAM","description":"### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large `/Length` value, regardless of the actual data length inside the stream.\n\n### Patches\nThis has been fixed in [pypdf==6.8.0](https://github.com/py-pdf/pypdf/releases/tag/6.8.0).\n\n### Workarounds\nIf you cannot upgrade yet, consider applying the changes from PR [#3675](https://github.com/py-pdf/pypdf/pull/3675).\n\nAs far as we are aware, this mostly affects reading from buffers of unknown size, as returned by `open(\"file.pdf\", mode=\"rb\")` for example. Passing a file path or a `BytesIO` buffer to *pypdf* instead does not seem to trigger the vulnerability.","status":"published","published":"2026-07-13T14:36:42.160674Z","modified":"2026-07-13T16:33:05.71451438Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T15:52:56.429374Z"},{"id":"UBUNTU-CVE-2026-31826","description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. This vulnerability is fixed in 6.8.0.","status":"published","published":"2026-03-10T22:16:00Z","modified":"2026-10-17T12:59:57.582873847Z","cvss":[{"version":"4.0","score":6.8,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:56:11.640778Z"},{"id":"CLSA-2026-1786946462","title":"TuxCare security update for pypdf (6 CVEs)","description":"TuxCare rebuilt pypdf to address 6 CVEs. Fixed in 5.9.0.post12+tuxcare.","status":"published","published":"2026-08-17T06:01:02Z","modified":"2026-10-15T09:48:05.559583552Z","updated_at":"2026-11-02T15:43:47.20725Z"},{"id":"openSUSE-SU-2026:10332-1","title":"python311-PyPDF2-2.11.1-7.1 on GA media","description":"These are all security issues fixed in the python311-PyPDF2-2.11.1-7.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-03-13T00:00:00Z","modified":"2026-03-14T08:24:07.127118Z","updated_at":"2026-11-02T16:58:38.101535Z"},{"id":"openSUSE-SU-2026:10334-1","title":"python311-pypdf-6.8.0-1.1 on GA media","description":"These are all security issues fixed in the python311-pypdf-6.8.0-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-03-13T00:00:00Z","modified":"2026-03-14T08:26:09.299984Z","updated_at":"2026-11-02T16:58:38.101535Z"},{"id":"openSUSE-SU-2026:20375-1","title":"Security update for python-PyPDF2","description":"This update for python-PyPDF2 fixes the following issues:\n\nChanges in python-PyPDF2:\n\n- CVE-2025-31826: Fixed denial of service due to excessive memory consumption via crafted PDF (bsc#1259508).\n","status":"withdrawn","published":"2026-03-17T15:19:48Z","modified":"2026-08-27T14:00:09.379224062Z","updated_at":"2026-11-02T16:58:41.463445Z"},{"id":"ROOT-APP-PYPI-CVE-2026-31826","title":"CVE-2026-31826 in pypdf - Patched by Root","description":"Root has patched CVE-2026-31826 in the pypdf package for Root:PyPI. Multiple fixed versions available.","status":"published","published":"2026-08-14T15:32:01Z","modified":"2026-08-14T17:00:13.829390259Z","updated_at":"2026-11-02T15:53:27.940619Z"}]}}