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Low 2.9Published May 10, 2026
CVE-2026-45186In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.
Updated under an hour ago ()
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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.
- CVSS
- 2.9 LOW (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weakness (CWE)
- CWE-407
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
libexpat project libexpat libexpat_project:libexpat (from the name) | before 2.8.1 | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:2.7.3-1.el10_2.1 not affected | CISA ADP |
Red Hat Red Hat JBoss Core Services 2.4.62.SP4 redhat:jboss_core_services | 1 | CISA ADP |
Red Hat Red Hat Discovery 2 redhat:discovery | from 1782159791 not affected | CISA ADP |
Red Hat Red Hat Update Infrastructure 5 redhat:rhui | from 1781525684 not affected | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 before V3.1.6 | CISA ADP |
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name) | from V3.1.5 before V3.1.6 | CISA ADP |
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name) | from V3.1.5 before V3.1.6 | CISA ADP |
libexpat_project libexpat libexpat_project:libexpat | before 2.8.1 | NVD |
References
- https://github.com/libexpat/libexpat/pull/1216exploit, issue-tracking, patch
- http://www.openwall.com/lists/oss-security/2026/05/11/16mailing-list, third-party-advisory
- 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
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45186.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.