CVE-2026-92239
highA maliciously constructed IMAP line could cause an out-of-bounds buffer read.
Vendor / product: Mozilla — thunderbird
A maliciously constructed IMAP line could cause an out-of-bounds buffer read. This vulnerability was fixed in Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
CVSS
8.1
8.1 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H Severity source: NVD CVSS v3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
Timeline (UTC)
Published: 2026-09-15 20:19
Modified: 2026-09-24 14:15
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-10-27 06:53 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
mozilla / thunderbird <140.16.0, ≥141.0 <153.3.0, ≥154.0 <156.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-94/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-95/
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-96/
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2060488 security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-94/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-95/ security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2026-96/ security@mozilla.org
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:53 UTC · record ↗