libexpat in Expat before 2.7.2 allows attackers to trigger large dynamic memory allocations via a small document that is submitted for parsing.
Fix
Vendor advisories in the News 1
- Hitachi Energy REB500 CISA ICS Advisories · 2026-10-06
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
In the news 1
- Hitachi Energy REB500 CISA advisories and alerts · 2026-10-06
Change history 1
- First seenCVSS 7.5 · libexpat_projectNVD modified 2026-10-19 17:10
Affected (CPE criteria) 1
cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*
References 9
- https://github.com/libexpat/libexpat/blob/676a4c531ec768732fac215da9730b5f50fbd2bf/expat/Changes#L45-L74 Product
- https://github.com/libexpat/libexpat/blob/R_2_7_2/expat/Changes Product
- https://github.com/libexpat/libexpat/issues/1018 Exploit, Issue Tracking
- https://github.com/libexpat/libexpat/pull/1034 Issue Tracking
- https://issues.oss-fuzz.com/issues/439133977 Exploit, Issue Tracking
- http://www.openwall.com/lists/oss-security/2025/09/16/2
- http://www.openwall.com/lists/oss-security/2026/05/01/5
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-089022.html