GitHub Advisoryadvisory · PyPI

GHSA-4vqv-7265-gm2w pypdf has possible large memory usage for exceptions in strict mode

HIGH Published 2026-10-30 Modified 2026-10-30 Official page ↗

Aliases: CVE-2026-119207
Ecosystem: PyPI
Packages: pypdf
Severity: High
CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weaknesses: CWE-400, CWE-405
Reviewed: 2026-10-30

Affected packages

• PyPI pypdf: < 6.21.3 → fixed in 6.21.3

Description

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. Workarounds If you cannot upgrade yet, consider applying the changes from PR #4265.

Alias · CVE (1)

CVE-2026-119207 pypdf is a free and open-source pure-python PDF library. vulnerability

Weakness · CWE (2)

CWE-400 Uncontrolled Resource Consumption weakness
CWE-405 Asymmetric Resource Consumption (Amplification) weakness

References

https://github.com/py-pdf/pypdf/security/advisories/GHSA-4vqv-7265-gm2w web
https://nvd.nist.gov/vuln/detail/CVE-2026-119207 advisory
https://github.com/py-pdf/pypdf/pull/4265 web
https://github.com/py-pdf/pypdf/commit/64270258c0eced720f7960aecf8cef31afd39f8d web
https://github.com/py-pdf/pypdf package
https://github.com/py-pdf/pypdf/releases/tag/6.21.3 web