{"id":"CVE-2026-103000","title":"pypdf is a free and open-source pure-python PDF library","summary":"pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause pypdf/_page_labels.py to generate strings beyond a reasonable page-label length…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-400","CWE-770"],"vendor":"pypdf_project","product":"pypdf","affected":["pypdf < 6.19.0"],"patched":["pypdf 6.19.0"],"published":"2026-09-30","updated":"2026-10-05","sourceUpdated":"2026-10-05T15:03:11.473","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-103000","references":[{"url":"https://github.com/py-pdf/pypdf/commit/0d8b5a8832cde1ba308b5c27567b879b7b7eed4a","label":"security-advisories@github.com"},{"url":"https://github.com/py-pdf/pypdf/pull/4096","label":"security-advisories@github.com"},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.19.0","label":"security-advisories@github.com"},{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-w23x-9jrw-r45c","label":"security-advisories@github.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103000.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-103000"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2544308"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-103000"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-103000"},{"url":"https://github.com/advisories/GHSA-w23x-9jrw-r45c"},{"url":"https://github.com/py-pdf/pypdf"},{"url":"https://pypi.org/project/pypdf"}],"tags":["nvd","cve.org","csaf","vex","red-hat","ghsa","pip","osv"],"epss":0.00352,"epssPercentile":0.28661,"aliases":["GHSA-w23x-9jrw-r45c","PYSEC-2026-4160"],"ecosystem":"pip","ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-30T20:49:14.062135Z"},"scores":{"nvd":7.5,"cna":8.7,"vendor":7.5},"ingestedAt":"2026-09-30T21:25:07.840Z","slug":"CVE-2026-103000","body":"## Overview\n\npypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause pypdf/_page_labels.py to generate strings beyond a reasonable page-label length when an application retrieves document page labels, consuming excessive memory and potentially making the application unavailable. This issue is fixed in version 6.19.0.\n\n## Affected\n\n- `pypdf < 6.19.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `pypdf 6.19.0`\n\n## Package advisory (CVE-2026-103000)\n\nAffected packages:\n\n- `pypdf < 6.19.0`\n\nPatched in:\n\n- `pypdf 6.19.0`\n\nSource: https://github.com/advisories/GHSA-w23x-9jrw-r45c\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Lightspeed Core, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI), Red Hat Quay 3 · no fix planned: Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux AI (RHEL AI) 3, Lightspeed Core, Red Hat OpenShift AI (RHOAI), … · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103000.json)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":215856,"id":"CVE-2026-103000","ts":1791213924924,"field":"cvss","old":"8.7","new":"7.5"}]}