SB20261022246 - Multiple vulnerabilities in PyPDF

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Main Vulnerability Database SB20261022246

SB20261022246 - Multiple vulnerabilities in PyPDF

Published: October 22, 2026 Updated: October 25, 2026

Security Bulletin ID SB20261022246
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Partial DoS

Breakdown by Severity

Medium 67% Low 33%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Excessive Iteration (CVE-ID: CVE-2026-115580)

CWE-ID: CWE-834 - Excessive Iteration

CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service through prolonged PDF processing.

The vulnerability exists due to excessive iteration in the pypdf cross-reference (xref) table parser when processing a PDF with large or incorrect upper limits in its xref table. A remote attacker can trick a user into opening a crafted PDF to cause excessively long processing times.


2) Inefficient Algorithmic Complexity (CVE-ID: CVE-2026-115585)

CWE-ID: CWE-407 - Inefficient Algorithmic Complexity

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service through excessive PDF processing times.

The vulnerability exists due to inefficient algorithmic complexity in pypdf's cross-reference stream processing when parsing PDFs containing repeated malformed cross-reference entries. A remote attacker can craft a PDF that triggers repeated loading of the entire stream despite an existing cache to prolong processing and reduce application availability.


3) Resource exhaustion (CVE-ID: CVE-2026-115572)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service through excessive PDF processing time.

The vulnerability exists due to uncontrolled resource consumption in pypdf's indirect object handling when processing repeated references to the same nonexistent object. A remote attacker can craft a PDF containing these references to cause prolonged processing when the affected portions of the file are loaded.


Remediation

Install update from vendor's website.

References