Integer Overflow or Wraparound Affecting thunderbird package, versions <0:140.7.1-1.amzn2.0.2


Severity

Recommended
0.0
medium
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.19% (10th percentile)

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  • Snyk IDSNYK-AMZN2-THUNDERBIRD-15324250
  • published20 Feb 2026
  • disclosed30 Jan 2026

Introduced: 30 Jan 2026

CVE-2026-25210  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 thunderbird to version 0:140.7.1-1.amzn2.0.2 or higher.
This issue was patched in ALAS2-2026-3171.

NVD Description

Note: Versions mentioned in the description apply only to the upstream thunderbird package and not the thunderbird package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1