py-pdf/pypdf · Security
pypdf: Inefficient handling of non-whitespace inputs in read_until_whitespace
- GHSA ID
- GHSA-fc8x-2rww-xw9m
- CVE ID
- CVE-2026-82398
- Severity
- medium
- Published
- Updated
- CVSS v4
- 6.9 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Description
Impact
An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a call to read_until_whitespace with an input which does not have whitespace for a long time.
Patches
This has been fixed in pypdf==6.15.0.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3947.
CWEs
- CWE-407 · Inefficient Algorithmic Complexity
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-fc8x-2rww-xw9m ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-82398 ↗
- https://github.com/py-pdf/pypdf/pull/3947 ↗
- https://github.com/py-pdf/pypdf/commit/4959848e057e37c218dccad7465259210923faaa ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.15.0 ↗
- https://github.com/advisories/GHSA-fc8x-2rww-xw9m ↗