Improper Handling of Unicode Encoding Affecting firefox-debuginfo package, versions <0:140.17.0-1.amzn2023.0.1


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.4% (33rd percentile)

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  • Snyk IDSNYK-AMZN2023-FIREFOXDEBUGINFO-20874597
  • published13 Oct 2026
  • disclosed19 Sept 2026

Introduced: 19 Sep 2026

CVE-2026-93990  (opens in a new tab)
CWE-176  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2023 firefox-debuginfo to version 0:140.17.0-1.amzn2023.0.1 or higher.
This issue was patched in ALAS2023-2026-3214.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox-debuginfo package and not the firefox-debuginfo package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.

Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted. Attackers can supply UTF-16 encoded XML containing lone high surrogates that consume the following code unit, causing Expat to pass unpaired surrogates to applications built with XML_UNICODE and to silently replace input characters in other builds.

CVSS Base Scores

version 3.1