What’s Vulnerable › Vulnerabilities

CVE-2026-45186

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-10 · updated 2026-09-16
• Weakness: CWE-407

Description

In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

Affected products

• libexpat project libexpat: before 2.8.1 — fixed in 2.8.1

How to fix

Upgrade to a fixed version: libexpat project libexpat 2.8.1. Check the vendor advisory for mitigations.

References

• https://github.com/libexpat/libexpat/pull/1216
• http://www.openwall.com/lists/oss-security/2026/05/11/16
• https://access.redhat.com/errata/RHSA-2026:22715
• https://access.redhat.com/errata/RHSA-2026:22721
• https://access.redhat.com/errata/RHSA-2026:23230
• https://access.redhat.com/errata/RHSA-2026:26319
• https://access.redhat.com/errata/RHSA-2026:27201
• https://access.redhat.com/errata/RHSA-2026:29197
• https://access.redhat.com/errata/RHSA-2026:58981
• https://access.redhat.com/security/cve/CVE-2026-45186
• https://bugzilla.redhat.com/show_bug.cgi?id=2468575
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html

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