7.1 High

pypdf has possible large memory usage for exceptions in strict mode

CVE-2026-119207

Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires loading an invalid dictionary. 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 [#4265](https://github.com/py-pdf/pypdf/pull/4265).

Assessment

CVSS: 7.1 (v4.0)
Severity: High
EPSS: 0.00304% 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-405

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

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