GHSA-fp3h-c4fm-7vvf

pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)

Source: GitHub Advisory Database (reviewed) High CVE-2026-102995

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 `/ToUnicode` entry of a font 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 [#4071](https://github.com/py-pdf/pypdf/pull/4071).

References

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

https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3h-c4fm-7vvf web
https://nvd.nist.gov/vuln/detail/CVE-2026-102995 advisory
https://github.com/py-pdf/pypdf/pull/4071 web
https://github.com/py-pdf/pypdf/commit/319d0b823ce2c311a2435e9fd93c13994d32bb51 web
https://github.com/py-pdf/pypdf package
https://github.com/py-pdf/pypdf/releases/tag/6.18.1 web