CVEvulnerability

CVE-2026-119205

7.1 HIGH EPSS 0.22% Published 2026-10-29 Modified 2026-11-02 Official page ↗

Exploitation and prioritisation

EPSS
0.22% chance of exploitation in the next 30 days · in the top 87.3% of all CVEs (2026-11-03)
CISA SSVC: exploitation
none
CISA SSVC: automatable
yes
CISA SSVC: technical impact
partial
EU Vulnerability Database
EUVD-2026-113377

Affected packages

EcosystemPackageVulnerableFixed inAdvisory
PyPIpypdf< 6.21.46.21.4GHSA-mfr5-77xh-9j7h
Status
Analyzed
Published
2026-10-29
Last modified
2026-11-02
Assigner
[email protected]
CVSS 4.0 ([email protected])
7.1 HIGH — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1 ([email protected])
5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weaknesses
CWE-835

Description

pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop when cloning or duplicating a crafted cyclic DictionaryObject. Clone traversal checked generated destination references rather than the original source references, allowing some source cycles to evade the visited-object check. This issue is fixed in version 6.21.4.

Affected configurations

• py-pdf pypdf (< 6.21.4)

Related

Weakness · CWE (1)

  • CWE-835 Loop with Unreachable Exit Condition weakness

Referenced by GitHub Advisory · alias (1)

  • GHSA-mfr5-77xh-9j7h pypdf has possible infinite loop when cloning dictionaries advisory · PyPI

References