py-pdf/pypdf · Security
pypdf: Possible long runtimes/large memory usage when retrieving outlines
- GHSA ID
- GHSA-23w6-3w8w-8484
- CVE ID
- CVE-2026-84310
- Severity
- medium
- Published
- Updated
- CVSS v4
- 4.8 · CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/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 and large memory consumption. This requires accessing the outlines of a document with either lots of entries or nested outlines with long re-used nesting paths.
Patches
This has been fixed in pypdf==6.16.1.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #3966.
CWEs
- CWE-405 · Asymmetric Resource Consumption (Amplification)
- CWE-834 · Excessive Iteration
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-23w6-3w8w-8484 ↗
- https://github.com/py-pdf/pypdf/pull/3966 ↗
- https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942 ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.16.1 ↗
- https://github.com/advisories/GHSA-23w6-3w8w-8484 ↗