CVE-2026-92238

thunderbird: Thunderbird: Memory safety violations via maliciously crafted mail headers

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Severity

Moderate

Red Hat Product Security

6.1

CVSS 3.1

Review impact separately from score.

Published · September 16, 2026

Updated · October 13, 2026

Description

A flaw was found in Thunderbird where a maliciously constructed mail header could lead to ambiguous parsing. This vulnerability could result in multiple mail header fields being incorrectly interpreted as one, or cause memory safety violations. A remote attacker could potentially exploit this to trigger unexpected application behavior or a denial of service.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')