GHSA-php9-fj8v-98fj

pypdf: Possible long runtimes when generating appearance streams

Source: GitHub Advisory Database (reviewed) High CVE-2026-102998

Packages

Ecosystem	Package	Affected	Fixed in
PyPI	pypdf	< 6.19.0	6.19.0

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 updating form field values with flattening enabled, which triggers appearance stream generation. ### Patches This has been fixed in [pypdf==6.19.0](https://github.com/py-pdf/pypdf/releases/tag/6.19.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4087](https://github.com/py-pdf/pypdf/pull/4087).

References

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

https://github.com/py-pdf/pypdf/security/advisories/GHSA-php9-fj8v-98fj web
https://nvd.nist.gov/vuln/detail/CVE-2026-102998 advisory
https://github.com/py-pdf/pypdf/pull/4087 web
https://github.com/py-pdf/pypdf/commit/959467a9b95be83e2dc5ae873ece5f371263ede7 web
https://github.com/py-pdf/pypdf package
https://github.com/py-pdf/pypdf/releases/tag/6.19.0 web