CVE-2026-74973

4.2 MEDIUM 0.2% exploit odds Fix listed Memory safety Browser & mail

What it is

Race condition, use-after-free in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

At a glance

Exploitability: Can be exploited over the network without logging in, but needs a user to act. Limited direct impact.
Exploit odds: 0.2% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-08-18 13:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-08-19 17:08 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.2% in the next 30 days (EPSS).
Severity: 4.2 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2026-08-18 13:17 UTC
Last modified: 2026-08-19 17:08 UTC
Exploit probability: 0.2% · EPSS, next 30 days
Weakness: CWE-362 · Race condition
Record status: Analyzed

Affected

Mozilla Firefox < 115.39.0
Mozilla Firefox < 140.14.0
Mozilla Firefox < 153.1.0
Mozilla Thunderbird < 140.14.0
Mozilla Thunderbird < 153.1.0

Attack profile CVSS 3.1 · 4.2

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: Required
Scope: Unchanged
Confidentiality: Low
Integrity: Low
Availability: None

Raw vector

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

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record