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CVE-2026-74944

CRITICAL
9.8NVD

Summary

generated automatically from NVD data

CVE-2026-74944 is a use-after-free flaw (CWE-416) in the DOM: Core & HTML component affecting Mozilla Firefox and Thunderbird. Memory being accessed after it has been freed can lead to high impact on confidentiality, integrity and availability, and the flaw can be reached over the network without privileges or user interaction. It is rated CRITICAL with a CVSS v3.1 score of 9.8, and Mozilla states it was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

NVD description

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

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EPSS · FIRST.org

0.59%probability of exploitation in the next 30 days

Higher than 47% of scored CVEs

EPSS (Exploit Prediction Scoring System) estimates, from observed exploitation activity, how likely a CVE is to be exploited in the next 30 days. It complements CVSS, which measures severity, not likelihood. Score of 2026-10-16, recomputed daily by FIRST.org.

In-depth analysis on cveo.tech

We've published a detailed analysis of this CVE — exploitation, IOCs and mitigation.

CVSS v3.1 Score

9.8
/ 10.0
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Information

Published
18 août 2026
Updated
21 août 2026
Status
Modified
Source
security@mozilla.org

Affected products

mozilla firefoxAll Mozilla Firefox CVEs →
Versions : 140.14.0, 153.1.0
mozilla thunderbird
Versions : 140.14.0, 153.1.0

Weaknesses (CWE)

CWE-416CWE-416

References (7)

Similar CVEs

Other vulnerabilities of type CWE-416

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