GHSA-g9cg-prrw-2r8q

pypdf: Possible large memory usage when parsing font data

Source: GitHub Advisory Database (reviewed) High CVE-2026-102996

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	pypdf	< 6.18.1	6.18.1

Details

As written in the advisory (Markdown source, shown as plain text).

### 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](https://github.com/py-pdf/pypdf/releases/tag/6.18.1). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4072](https://github.com/py-pdf/pypdf/pull/4072).

References

External links from the advisory. They lead to third-party sites.

https://github.com/py-pdf/pypdf/security/advisories/GHSA-g9cg-prrw-2r8q web
https://nvd.nist.gov/vuln/detail/CVE-2026-102996 advisory
https://github.com/py-pdf/pypdf/pull/4072 web
https://github.com/py-pdf/pypdf/commit/0fb26eb8cdd01c44b3b2c9fe8329751be2f7cfd5 web
https://github.com/py-pdf/pypdf package
https://github.com/py-pdf/pypdf/releases/tag/6.18.1 web