PT-2026-2245 · Pypi+2 · Pypdf+2

Mkaalto · Published 2026-01-01 · Updated 2026-04-17 · CVE-2026-22691

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions pypdf versions prior to 6.6.0

Description pypdf is a pure-python PDF library. Versions prior to 6.6.0 are susceptible to long runtimes when processing malformed startxref entries within PDF files. An attacker can create a specially crafted PDF that causes prolonged processing times when the cross-reference table is rebuilt, particularly with files containing excessive whitespace. This issue only affects the non-strict reading mode.

Recommendations Update to version 6.6.0 or later.

Exploit

Fix

Resource Exhaustion

DoS

Weakness Enumeration

CWE-400

CWE-1333

Related Identifiers

CVE-2026-22691

GHSA-4F6G-68PF-7VHV

Affected Products

Debian

Red Os

Pypdf

References · 20

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22691.json · Exploit
• https://github.com/py-pdf/pypdf/pull/3594 · Patch
• https://github.com/py-pdf/pypdf/commit/294165726b646bb7799be1cc787f593f2fdbcf45 · Patch
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-4f6g-68pf-7vhv · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-22691 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-22691 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-22691 · Security Note
• https://osv.dev/vulnerability/CVE-2026-22691 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-22691 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-22691 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-22691 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-4f6g-68pf-7vhv · Vendor Advisory
• https://github.com/py-pdf/pypdf · Note
• https://github.com/py-pdf/pypdf/releases/tag/6.6.0 · Note
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti-red-os-8-0/uyazvimost-python-pypdf2-cve-2026-22691-8.0 · Note