GHSA-5jq2-8x83-x246

pypdf: Possible long runtimes/large memory usage when parsing indirect objects

Source: GitHub Advisory Database (reviewed) High CVE-2026-102994

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	pypdf	< 6.18.0	6.18.0

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 long runtimes. This requires reading a PDF document with long indirect object headers, not terminated by whitespace. ### Patches This has been fixed in [pypdf==6.18.0](https://github.com/py-pdf/pypdf/releases/tag/6.18.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4055](https://github.com/py-pdf/pypdf/pull/4055).

References

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

https://github.com/py-pdf/pypdf/security/advisories/GHSA-5jq2-8x83-x246 web
https://nvd.nist.gov/vuln/detail/CVE-2026-102994 advisory
https://github.com/py-pdf/pypdf/pull/4055 web
https://github.com/py-pdf/pypdf/commit/82501d2993c6387833c4949d205caeb188f8bb9e web
https://github.com/py-pdf/pypdf package
https://github.com/py-pdf/pypdf/releases/tag/6.18.0 web