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Low 2.9Published Apr 16, 2026
CVE-2026-41080libexpat before 2.8.0 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document.
Updated under an hour ago ()
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It affects libexpat project libexpat and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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libexpat before 2.8.0 uses insufficient entropy, and thus hash flooding can occur via a crafted XML document.
- 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-331
- 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 2.8.0 | CNA record |
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 2.8.0 | NVD |
References
- https://github.com/libexpat/libexpat/pull/1183issue-tracking, patch
- https://github.com/libexpat/libexpat/issues/47issue-tracking
- https://www.openwall.com/lists/oss-security/2026/04/26/1mailing-list
- https://blog.hartwork.org/posts/expat-2-8-0-released/release-notes
- http://www.openwall.com/lists/oss-security/2026/04/26/1mailing-list
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
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.