{"id":"CVE-2026-84311","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 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused fo…","severity":"medium","cwe":["CWE-834","CWE-770"],"vendor":"pypdf","product":"pypdf","affected":["pypdf < 6.16.1"],"patched":["pypdf 6.16.1"],"published":"2026-09-01","updated":"2026-09-09","sourceUpdated":"2026-09-09T16:49:20.627","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-84311","references":[{"url":"https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942","label":"security-advisories@github.com"},{"url":"https://github.com/py-pdf/pypdf/pull/3966","label":"security-advisories@github.com"},{"url":"https://github.com/py-pdf/pypdf/releases/tag/6.16.1","label":"security-advisories@github.com"},{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-763m-79hh-57f2"},{"url":"https://github.com/py-pdf/pypdf"},{"url":"https://pypi.org/project/pypdf"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84311"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84311.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-84311"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2527050"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-84311"}],"tags":["nvd","ghsa","pip","osv","csaf","vex","red-hat"],"epss":0.00138,"epssPercentile":0.03552,"aliases":["GHSA-763m-79hh-57f2","PYSEC-2026-3911"],"ecosystem":"pip","ingestedAt":"2026-09-01T21:32:41.472Z","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","cvssSource":"vendor","slug":"CVE-2026-84311","body":"## Overview\n\npypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-84311)\n\nAffected packages:\n\n- `pypdf < 6.16.1`\n\nPatched in:\n\n- `pypdf 6.16.1`\n\nSource: https://github.com/advisories/GHSA-763m-79hh-57f2\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Ansible Automation Orchestrator 2026, Exploit Intelligence, Lightspeed Core, OpenShift Lightspeed, Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux AI (RHEL AI) 3, … · no fix planned: Exploit Intelligence, Red Hat Ansible Automation Platform 2, Red Hat Quay 3, Ansible Automation Orchestrator 2026, … · updated 2026-09-25 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-84311.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":210662,"id":"CVE-2026-84311","ts":1790322150724,"field":"cvss","old":null,"new":"5.5"}]}