py-pdf/pypdf · Security
pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)
- GHSA ID
- GHSA-fp3h-c4fm-7vvf
- CVE ID
- CVE-2026-102995
- Severity
- high
- Published
- Updated
- CVSS v4
- 8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Description
Impact
An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires parsing the /ToUnicode entry of a font with unusually large values, for example during text extraction.
Patches
This has been fixed in pypdf==6.18.1.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #4071.
CWEs
- CWE-400 · Uncontrolled Resource Consumption
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3h-c4fm-7vvf ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-102995 ↗
- https://github.com/py-pdf/pypdf/pull/4071 ↗
- https://github.com/py-pdf/pypdf/commit/319d0b823ce2c311a2435e9fd93c13994d32bb51 ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.18.1 ↗
- https://github.com/advisories/GHSA-fp3h-c4fm-7vvf ↗