CVE-2026-25210

Public on 2026-01-30

Modified on 2026-01-30

Description

In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation.

Severity

Medium

See what this means

CVSS v3 Base Score

6.9

See breakdown

Affected Packages

Platform	Package	Release Date	Advisory	Status
Amazon Linux 2 - Core	expat	2026-02-19	ALAS2-2026-3170	Fixed
Amazon Linux 2023	expat	2026-02-18	ALAS2023-2026-1425	Fixed
Amazon Linux 2 - Firefox Extra	firefox	2026-02-19	ALAS2FIREFOX-2026-051	Fixed
Amazon Linux 2023	firefox	2026-02-18	ALAS2023-2026-1424	Fixed
Amazon Linux 2 - Core	thunderbird	2026-02-19	ALAS2-2026-3171	Fixed

CVSS Scores

	Score Type	Score	Vector
Amazon Linux	CVSSv3	6.9	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-25210 Mitre: CVE-2026-25210