Algorithmic Complexity Affecting thunderbird package, versions <0:140.10.2-1.amzn2.0.2


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.44% (37th percentile)

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  • Snyk IDSNYK-AMZN2-THUNDERBIRD-16881528
  • published27 May 2026
  • disclosed10 May 2026

Introduced: 10 May 2026

CVE-2026-45186  (opens in a new tab)
CWE-407  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 thunderbird to version 0:140.10.2-1.amzn2.0.2 or higher.
This issue was patched in ALAS2-2026-3315.

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 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

CVSS Base Scores

version 3.1