CVE-2026-102998CWE-400denial-of-service

CVE-2026-102998

High · published October 1, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
26.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
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
EPSS
0.00345 · 26.8th percentile
Weakness
CWE-400 · Uncontrolled Resource Consumption
Published
2026-10-01T01:17Z
Affected products (1)
ProductVersionsFixed in
pypdf_project/pypdf< 6.19.06.19.0
References (4)
https://github.com/py-pdf/pypdf/commit/959467a9b95be83e2dc5ae873ece5f371263ede7 · [email protected]https://github.com/py-pdf/pypdf/pull/4087 · [email protected]https://github.com/py-pdf/pypdf/releases/tag/6.19.0 · [email protected]https://github.com/py-pdf/pypdf/security/advisories/GHSA-php9-fj8v-98fj · [email protected]
EPSS history
Timeline
  • 02 OCT 03:41Z
    EPSS moved — → 1%
    epss
  • 30 SEP 20:09Z
    pypdf: Possible long runtimes when generating appearance streams
    cvelistv5