py-pdf/pypdf · Security
pypdf: Possible long runtimes when generating appearance streams
- GHSA ID
- GHSA-php9-fj8v-98fj
- CVE ID
- CVE-2026-102998
- 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 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.
Workarounds
If you cannot upgrade yet, consider applying the changes from PR #4087.
CWEs
- CWE-400 · Uncontrolled Resource Consumption
References
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-php9-fj8v-98fj ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-102998 ↗
- https://github.com/py-pdf/pypdf/pull/4087 ↗
- https://github.com/py-pdf/pypdf/commit/959467a9b95be83e2dc5ae873ece5f371263ede7 ↗
- https://github.com/py-pdf/pypdf/releases/tag/6.19.0 ↗
- https://github.com/advisories/GHSA-php9-fj8v-98fj ↗