CVE-2023-4049

Race conditions in reference counting code were found through code inspection. These could have resulted in potentially exploitable use-after-free vulnerabilities. This vulnerability affects Firefox < 116, Firefox ESR < 102.14, and Firefox ESR < 115.1.

CVSS 3.1

5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

0.6% chance of exploitation in the next 30 days; higher than 50% of CVEs (scores of 2026-10-25)

CWE

CWE-362

Published

2023-08-01

Modified

2026-10-23

Record from

the NVD, synced 2026-10-24

Affected

• debian:debian_linux
• mozilla:firefox

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1842658
• https://lists.debian.org/debian-lts-announce/2023/08/msg00008.html
• https://lists.debian.org/debian-lts-announce/2023/08/msg00010.html
• https://www.debian.org/security/2023/dsa-5464
• https://www.debian.org/security/2023/dsa-5469

Check your stackJSON