CVE-2026-102998

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can cause pypdf/generic/_appearance_stream.py appearance-stream generation to repeat invariant selection-data work inside a loop when an application updates fields with flattening enabled, resulting in excessive runtimes and application unavailability. This issue is fixed in version 6.19.0.

References

• https://github.com/py-pdf/pypdf/commit/959467a9b95be83e2dc5ae873ece5f371263ede7
• https://github.com/py-pdf/pypdf/pull/4087
• https://github.com/py-pdf/pypdf/releases/tag/6.19.0
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-php9-fj8v-98fj