SB2026032435 - Multiple DoS vulnerabilities in libexpat
Published: March 24, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 secuirty vulnerabilities.
1) NULL pointer dereference (CVE-ID: CVE-2026-32778)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in the function setContext in libexpat when processing XML input under low-memory conditions. A remote attacker can send a specially crafted XML file to cause a denial of service.
Exploitation requires repeated processing of malicious input following an initial out-of-memory condition.
2) Infinite loop (CVE-ID: CVE-2026-32777)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an infinite loop in the DTD content parser when processing a specially crafted XML file. A remote attacker can send a specially crafted request to cause a denial of service.
3) NULL Pointer Dereference (CVE-ID: CVE-2026-32776)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in the XML parser when processing malicious XML content with empty external parameter entity content. A remote attacker can send a specially crafted XML file to cause a denial of service.
Remediation
Install update from vendor's website.