7.5

CVE-2026-84642

Allowed UNC hostnames for attachments interpreted as a regular expression

The values of the mail.allowed_attachment_hostnames advanced config setting were used in a regular expression without escaping. For some possible valid hostnames, this could allow certain unintended hostnames to also match and serve remote attachments. This vulnerability was fixed in Thunderbird 155 and Thunderbird 153.2.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Mozilla ≫ Thunderbird Version < 153.2.0
Mozilla ≫ Thunderbird Version >= 154.0 < 155.0
VulnDex Vulnerability Enrichment
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.27% 0.19
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
CISA-ADP 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE-1333 Inefficient Regular Expression Complexity

The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential.

https://www.mozilla.org/security/advisories/mfsa2026-86/
Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=2060462
Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-88/
Vendor Advisory