SB2026042749 - Resource exhaustion in PyPDF
Published: April 27, 2026
Security Bulletin ID
SB2026042749
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Resource exhaustion (CVE-ID: CVE-2026-28351)
CWE-ID: CWE-400 - Resource exhaustion
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause excessive memory consumption.
The vulnerability exists due to uncontrolled resource consumption in the RunLengthDecode filter when parsing a crafted PDF content stream. A remote attacker can supply a specially crafted PDF to cause excessive memory consumption.
Exploitation requires the application to parse the content stream using the RunLengthDecode filter.
Remediation
Install update from vendor's website.