Description
libexpat before 2.7.5 allows an infinite loop while parsing DTD content.
Affected products
libexpat_project: libexpat
References6
- github.com/libexpat/libexpat/issues/1161 ExploitIssue TrackingVendor Advisory
- github.com/libexpat/libexpat/pull/1159 Issue TrackingPatch
- github.com/libexpat/libexpat/pull/1162 Issue TrackingPatch
- issues.oss-fuzz.com/issues/486993411 Permissions Required
- cert-portal.siemens.com/productcert/html/ssa-082556.html
- cert-portal.siemens.com/productcert/html/ssa-457936.html
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 15 · as of 12 November 2026
- CWE
- CWE-835
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.