What is GHSA-php9-fj8v-98fj?

GHSA-php9-fj8v-98fj is a security advisory published by GitHub Security Advisories with High severity. pypdf: Possible long runtimes when generating appearance streams

Which CVE IDs does GHSA-php9-fj8v-98fj cover?

GHSA-php9-fj8v-98fj covers the following CVE IDs: CVE-2026-102998. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-php9-fj8v-98fj?

GHSA-php9-fj8v-98fj affects 1 product, including: pip/pypdf:\u003c 6.19.0.

GHSA-php9-fj8v-98fjHigh

pypdf: Possible long runtimes when generating appearance streams

Vendor

GitHub Security Advisories

Published

October 1, 2026

Last Modified

October 1, 2026

🔗 CVE IDs covered (1)

CVE-2026-102998 →

📋 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.

🎯 Affected products1

pip/pypdf:< 6.19.0

🔗 References (6)

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