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Ubuntu Security NoticesUSN-8813-1

USN-8813-1: Expat vulnerabilities

It was discovered that Expat did not correctly handle certain integer arithmetic. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-56406, CVE-2026-56407, CVE-2026-56409, CVE-2026-56410, CVE-2026-56411) It was discovered that Expat did not correctly track handler call depth. An attacker could possibly use this issue to cause Expat to crash or execute arbitrary code. (CVE-2026-56131) It was discovered that Expat did not correctly handle certain memory operations. An attacker could possibly use this issue to cause Expat to crash or execute arbitrary code. (CVE-2026-56132) It was discovered that Expat did not correctly handle certain Unicode characters. An attacker could possibly use this issue to cause Expat to use excessive resources, leading to a denial of service. (CVE-2026-72522) It was discovered that Expat did not correctly process certain XML attributes. A remote attacker could possibly use this issue to cause Expat to use excessive resources, leading to a denial of service. (CVE-2026-66046) It was discovered that Expat did not correctly handle certain external entities. An attacker could possibly use this issue to cause Expat to crash or execute arbitrary code. (CVE-2026-76641) It was discovered that Expat did not correctly track handler call depth with custom encodings. An attacker could possibly use this issue to cause Expat to crash or execute arbitrary code. (CVE-2026-76957)

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Scope

What the vendor says is affected

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Timeline

When this advisory changed

  1. Published by Ubuntu

    The publication date reported by the vendor.

  2. Added to SecurityAlert

    We collected the advisory from the official source.

  3. Confirmed at the source

    Our collector saw this advisory during a later source check.

Vulnerabilities

CVEs named in this advisory

CVE-2026-56406View CVSS, KEV, EPSS, and threat contextCVE-2026-56407View CVSS, KEV, EPSS, and threat contextCVE-2026-56409View CVSS, KEV, EPSS, and threat contextCVE-2026-56410View CVSS, KEV, EPSS, and threat contextCVE-2026-56411View CVSS, KEV, EPSS, and threat contextCVE-2026-56131View CVSS, KEV, EPSS, and threat contextCVE-2026-56132View CVSS, KEV, EPSS, and threat contextCVE-2026-72522View CVSS, KEV, EPSS, and threat contextCVE-2026-66046View CVSS, KEV, EPSS, and threat contextCVE-2026-76641View CVSS, KEV, EPSS, and threat contextCVE-2026-76957View CVSS, KEV, EPSS, and threat context
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