CVE-2026-45186

Summary

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 Software

Weaknesses

• CWE-407: CWE-407 Inefficient Algorithmic Complexity

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

CVE Program Container

Additional References

• http://www.openwall.com/lists/oss-security/2026/05/11/16

libexpat: denial of service via crafted XML input

Additional References

• https://access.redhat.com/security/cve/CVE-2026-45186
• https://bugzilla.redhat.com/show_bug.cgi?id=2468575
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45186.json
• https://access.redhat.com/errata/RHSA-2026:22715
• https://access.redhat.com/errata/RHSA-2026:23230
• https://access.redhat.com/errata/RHSA-2026:22721
• https://access.redhat.com/errata/RHSA-2026:29197
• https://access.redhat.com/errata/RHSA-2026:27201
• https://access.redhat.com/errata/RHSA-2026:26319

Additional References

• https://cert-portal.siemens.com/productcert/html/ssa-082556.html

References

• https://github.com/libexpat/libexpat/pull/1216

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