py-pdf/pypdf · Security
pypdf: Possible large memory usage when parsing font data
- GHSA ID
- GHSA-g9cg-prrw-2r8q
- CVE ID
- CVE-2026-102996
- 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 /Widths entry of a TrueType or Type1 fonts 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 #4072.
CWEs
- CWE-400 · Uncontrolled Resource Consumption
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-g9cg-prrw-2r8q ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-102996 ↗
- https://github.com/py-pdf/pypdf/pull/4072 ↗
- https://github.com/py-pdf/pypdf/commit/0fb26eb8cdd01c44b3b2c9fe8329751be2f7cfd5 ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.18.1 ↗
- https://github.com/advisories/GHSA-g9cg-prrw-2r8q ↗