Out-of-bounds Read Affecting thunderbird-debuginfo package, versions <0:140.13.0-1.el10_2


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.27% (20th percentile)

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  • Snyk IDSNYK-RHEL10-THUNDERBIRDDEBUGINFO-18513580
  • published4 Aug 2026
  • disclosed22 Jul 2026

Introduced: 22 Jul 2026

CVE-2026-14899  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade RHEL:10 thunderbird-debuginfo to version 0:140.13.0-1.el10_2 or higher.
This issue was patched in RHSA-2026:49621.

NVD Description

Note: Versions mentioned in the description apply only to the upstream thunderbird-debuginfo package and not the thunderbird-debuginfo package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

The code to parse MIME headers for display when forwarding a message (if the setting to view all headers was enabled) had an off-by-one error, allowing a single byte to be read from the memory after the buffer for the headers, and potentially crashing Thunderbird. This vulnerability was fixed in Thunderbird 153 and Thunderbird 140.13.

CVSS Base Scores

version 3.1