CVE-2026-45186

high

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.

References

https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45186.json

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

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

https://bugzilla.redhat.com/show_bug.cgi?id=2468575

https://access.redhat.com/security/cve/CVE-2026-45186

https://access.redhat.com/errata/RHSA-2026:29197

https://access.redhat.com/errata/RHSA-2026:27201

https://access.redhat.com/errata/RHSA-2026:26319

https://access.redhat.com/errata/RHSA-2026:23230

https://access.redhat.com/errata/RHSA-2026:22721

https://access.redhat.com/errata/RHSA-2026:22715

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

Details

Source: Mitre, NVD

Published: 2026-05-10

Updated: 2026-07-14

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H