7.1
High
pypdf has possible large memory usage when parsing cross-reference streams
CVE-2026-119209
Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires opening a file with cross-reference streams. Patches This has been fixed in [pypdf==6.21.3](https://github.com/py-pdf/pypdf/releases/tag/6.21.3). Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4269](https://github.com/py-pdf/pypdf/pull/4269).
Assessment
- CVSS
- 7.1 (v4.0)
- Severity
- High
- EPSS
- 0.00319% chance of exploitation in the next 30 days
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 30 October 2026
- Last updated
- 30 October 2026
- Affected
- pip · pypdf
- Weakness
- CWE-400, CWE-770
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
At the source
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-x3rh-gjgm-fmqc
- https://nvd.nist.gov/vuln/detail/CVE-2026-119209
- https://github.com/py-pdf/pypdf/pull/4269
- https://github.com/py-pdf/pypdf/commit/a93fe3a901fd00af38f0a105c3ba7175fa72dcb4
- https://github.com/py-pdf/pypdf/releases/tag/6.21.3
- https://github.com/advisories/GHSA-x3rh-gjgm-fmqc
Query this programmatically
Agents can read this through the MCP endpoint, or over HTTP:
curl https://cve.zerocrew.in/api/cve/CVE-2026-119209