CVE-2026-115585
Published:October 23, 2026
Updated:October 27, 2026
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an incomplete remediation for repeated malformed cross-reference entries in GHSA-55h5-xmcq-c37v could still trigger a complete PDF stream reload during each recovery attempt even when a recovery cache was present, causing crafted cross-reference streams to produce long runtimes. This issue is fixed in version 6.21.2.
Affected Packages
pypdf (CONDA):
Affected version(s) >=6.0.0 <6.21.2Fix Suggestion:
Update to version 6.21.2https://github.com/py-pdf/pypdf.git (GITHUB):
Affected version(s) >=6.0.0 <6.21.2Fix Suggestion:
Update to version 6.21.2pypdf (PYTHON):
Affected version(s) >=6.0.0 <6.21.2Fix Suggestion:
Update to version 6.21.2pypdf (PYTHON):
Affected version(s) >=1.0 <6.21.2Fix Suggestion:
Update to version 6.21.2Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.41