CVE-2026-102996CWE-400denial-of-service

CVE-2026-102996

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 6.18.1, a crafted PDF can provide a TrueType or Type1 simple font with an unusually large /Widths array, causing pypdf/_font.py Font._collect_tt_t1_character_widths to process entries beyond the 256 character codes meaningful for a simple font and consume excessive memory during operations such as text extraction. This issue is fixed in version 6.18.1.

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< 6.18.16.18.1
References (4)
https://github.com/py-pdf/pypdf/commit/0fb26eb8cdd01c44b3b2c9fe8329751be2f7cfd5 · [email protected]https://github.com/py-pdf/pypdf/pull/4072 · [email protected]https://github.com/py-pdf/pypdf/releases/tag/6.18.1 · [email protected]https://github.com/py-pdf/pypdf/security/advisories/GHSA-g9cg-prrw-2r8q · [email protected]
EPSS history
Timeline
  • 02 OCT 03:41Z
    EPSS moved — → 1%
    epss
  • 30 SEP 20:03Z
    pypdf: Possible large memory usage when parsing font data
    cvelistv5