by Kastro
Paper/Archive/CVE-2026-124864

CVE-2026-124864

Mozilla Firefox — Sandbox escape due to use-after-free in the DOM: Service Workers component

CVSS 9.6
critical.is priorityof 100
29
CVSS 9.6 (ADP)9.6 / 10 × 3028.8Not in CISA KEV+300.0No EPSS score.000 × 200.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Sandbox escape due to use-after-free in the DOM: Service Workers component. This vulnerability was fixed in Firefox 160, Firefox ESR 115.45, and Firefox ESR 153.7.

Affected

ProductAffectedFixed inSource
Firefoxsee advisory115.45CNA

Scores by source

CISA ADP9.6CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refbugzilla.mozilla.org/show_bug.cgi?id=2075976refmozilla.org/security/advisories/mfsa2026-125refmozilla.org/security/advisories/mfsa2026-126refmozilla.org/security/advisories/mfsa2026-127