Description
libexpat through 2.5.0 allows recursive XML Entity Expansion if XML_DTD is undefined at compile time.
Affected products
libexpat_project: libexpat
References10
- github.com/libexpat/libexpat/commit/0f075ec8ecb5e43f8fdca5182f8… PatchVendor Advisory
- github.com/libexpat/libexpat/pull/777 Vendor Advisory
- github.com/libexpat/libexpat/commit/0f075ec8ecb5e43f8fdca5182f8… PatchVendor Advisory
- github.com/libexpat/libexpat/pull/777 Vendor Advisory
- cwe.mitre.org/data/definitions/776.html Technical Description
- lists.fedoraproject.org/archives/list/package-announce%40lists.…
- lists.fedoraproject.org/archives/list/package-announce%40lists.…
- security.netapp.com/advisory/ntap-20240307-0005/
- cwe.mitre.org/data/definitions/776.html Technical Description
- lists.fedoraproject.org/archives/list/package-announce%40lists.…
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: 34 · as of 5 November 2026
- CWE
- CWE-776
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.