CVE-2026-124921 mozilla
mozilla: no CVSS score yet. EPSS 0.2% estimated probability of exploitation activity in the next 30 days.
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Sandbox escape in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 160 and Thunderbird 160.
- EPSS
- 0.2% estimated probability of exploitation activity in the next 30 days; 8th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- Published
- Modified
- Assigned by
- mozilla (CNA)
- NVD analysis
- Deferred: the NVD does not plan to analyze it
- Record from
- the NVD, synced
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Explain CVE-2026-124921 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-124921?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-124921?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-124921 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
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Affected
Versions
From the CNA's record in the CVE List.
Fixed in
| Product | Fixed in |
|---|---|
| Mozilla Firefox | 160 |
| Mozilla Thunderbird | 160 |
Fix and patched versions
- Mozilla Firefox: fixed in 160
- Mozilla Thunderbird: fixed in 160
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Ubuntu | 18.04:LTS | mozjs38, mozjs52 | no fix listed | UBUNTU-CVE-2026-124921 |
| Ubuntu | 20.04:LTS | mozjs52, mozjs68 | no fix listed | UBUNTU-CVE-2026-124921 |
| Ubuntu | 22.04:LTS | mozjs78, mozjs91, mozjs102 and 1 more | no fix listed | UBUNTU-CVE-2026-124921 |
| Ubuntu | 24.04:LTS | mozjs102, mozjs115 | no fix listed | UBUNTU-CVE-2026-124921 |
From the distributions' data via OSV.dev: Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Ubuntu.
History
- The NVD deferred its analysis
Changes since this site first stored the record. The same for every record: /api/public/changes.