High 7.5Published Sep 29, 2026

CVE-2026-100805Race condition, use-after-free in the Audio/Video component

Updated under an hour ago (2026-10-19 09:10 UTC)

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

EPSS puts the chance of exploitation in the next 30 days at 0.22%, higher than 12% of scored CVEs.

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Exploited in the last 30 days

Race condition, use-after-free in the Audio/Video component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

CVSS: 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-362, CWE-416
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.22% (percentile 12)
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=2058785
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.