Medium 6.5Published Sep 29, 2026

CVE-2026-100795Denial-of-service in the Networking component

Updated under an hour ago (2026-10-19 06:20 UTC)

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It affects Mozilla Thunderbird and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Mozilla Thunderbird

Exploited in the last 30 days

Denial-of-service in the Networking component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

CVSS: 6.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-770
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mozilla
NVD analysis: Undergoing Analysis
Record last updated: Sep 30, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Mozilla Thunderbird mozilla:thunderbird (from the name)	from 157 not affected	CNA record
Mozilla Firefox mozilla:firefox (from the name)	from 157 not affected	CNA record

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2048871
https://www.mozilla.org/security/advisories/mfsa2026-101/
https://www.mozilla.org/security/advisories/mfsa2026-97/

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.