{"id":"CVE-2026-59937","title":"pypdf: pypdf: Denial of Service via crafted PDF with malformed cross-reference streams (CVE-2026-59937)","summary":"A flaw was found in pypdf, a pure-python PDF library. A remote attacker could exploit this vulnerability by crafting a malicious PDF file containing repeated malformed cross-reference streams. This could cause the pypdf library to spend ex…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-1050","CWE-400"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux AI (RHEL AI) 3","affected":["exploit_intelligence","openshift_lightspeed","ansible_automation_platform 2","enterprise_linux_ai_rhel_ai 3","openshift_ai_rhoai","quay 3"],"patched":["pypdf 6.14.0"],"published":"2026-07-08","updated":"2026-10-15","sourceUpdated":"2026-10-15T11:20:43+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59937.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59937.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-59937"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2498170"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-59937"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59937"},{"url":"https://github.com/py-pdf/pypdf/commit/b5fc5aa714f4b696fb9b1deaa35a9e4a4eb50dae"},{"url":"https://github.com/py-pdf/pypdf/pull/3887"},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.14.0"},{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-55h5-xmcq-c37v"},{"url":"https://github.com/py-pdf/pypdf"},{"url":"https://github.com/advisories/GHSA-55h5-xmcq-c37v"}],"tags":["csaf","vex","red-hat","osv","pip","ghsa"],"epss":0.0062,"epssPercentile":0.49483,"aliases":["GHSA-55h5-xmcq-c37v","PYSEC-2026-3610"],"ecosystem":"pip","ingestedAt":"2026-07-23T15:18:37.923Z","slug":"CVE-2026-59937","body":"## Overview\n\nA flaw was found in pypdf, a pure-python PDF library. A remote attacker could exploit this vulnerability by crafting a malicious PDF file containing repeated malformed cross-reference streams. This could cause the pypdf library to spend excessive time recovering broken cross-reference table entries, leading to a denial of service (DoS) condition for applications processing such files.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Exploit Intelligence, OpenShift Lightspeed, 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: Exploit Intelligence, OpenShift Lightspeed, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux AI (RHEL AI) 3, … · updated 2026-10-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-59937.json)\n\n**pypdf: pypdf: Denial of Service via crafted PDF with malformed cross-reference streams** — rated Moderate by Red Hat. Released 2026-07-08, updated 2026-10-15.\n\nAffected:\n\n- Exploit Intelligence\n- OpenShift Lightspeed\n- Red Hat Ansible Automation Platform 2\n- Red Hat Enterprise Linux AI (RHEL AI) 3\n- Red Hat OpenShift AI (RHOAI)\n- Red Hat Quay 3\n\nNo fix planned:\n\n- Exploit Intelligence\n- OpenShift Lightspeed\n- Red Hat Ansible Automation Platform 2\n- Red Hat Enterprise Linux AI (RHEL AI) 3\n- Red Hat OpenShift AI (RHOAI)\n- Red Hat Quay 3\n\n## Remediation\n\nFix deferred\n\n## Package advisory (CVE-2026-59937)\n\nAffected packages:\n\n- `pypdf < 6.14.0`\n\nPatched in:\n\n- `pypdf 6.14.0`\n\nSource: https://osv.dev/vulnerability/GHSA-55h5-xmcq-c37v","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":222215,"id":"CVE-2026-59937","ts":1792065085896,"field":"cvss","old":null,"new":"6.5"}]}