CVE-2026-102998

high

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/security/advisories/GHSA-php9-fj8v-98fj

https://github.com/py-pdf/pypdf/releases/tag/6.19.0

https://github.com/py-pdf/pypdf/pull/4087

https://github.com/py-pdf/pypdf/commit/959467a9b95be83e2dc5ae873ece5f371263ede7

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-90384

Details

Source: Mitre, NVD

Published: 2026-09-30

Updated: 2026-10-01

Named Vulnerability: GHSA-php9-fj8v-98fj

Risk Information

CVSS v2

Base Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 5.5

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Severity: Medium

CVSS v4

Base Score: 8.7

Vector: 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

Severity: High

EPSS

EPSS: 0.00524