CVE-2026-124317

MediumCVSS 4.8/10Last modified Nov 11, 2026

Description

libexpat through 2.10.0 contains an out-of-bounds read vulnerability in unknown_toUtf8() and unknown_toUtf16() in xmltok.c when handling application-registered unknown encodings. Attackers can supply a document ending in a truncated multibyte sequence so the convert callback reads past the parse buffer, leaking adjacent memory or crashing applications.

Metrics

CVSS 3.1 4.8/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

Weakness enumeration

CWE-126

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
libexpat	libexpat	<= 2.10.0

References

Timeline

Published: Nov 7, 2026
Last modified: Nov 11, 2026
NVD status: Awaiting Analysis

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