CVSS 3.1
8.8 highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HCVE-2026-124852 mozilla: Classic Buffer Overflow
High (8.8) in mozilla. EPSS 0.4% estimated probability of exploitation activity in the next 30 days.
On this page
Incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 160 and Thunderbird 160.
Severity
- EPSS
- 0.4% estimated probability of exploitation activity in the next 30 days; 32nd percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CISA's assessment (SSVC)
- Exploitation: none · Automatable: no · Technical impact: total, assessed 2026-11-10. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
- CWE
- CWE-120 Buffer Copy without Checking Size of Input (Classic Buffer Overflow)
- Published
- Modified
- Assigned by
- mozilla (CNA)
- NVD analysis
- Deferred: the NVD does not plan to analyze it
- Record from
- the NVD, synced
Ask an AI about this CVE
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Explain CVE-2026-124852 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-124852?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-124852?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-2026-124852 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-2026-124852 |
| Ubuntu | 20.04:LTS | mozjs52, mozjs68 | no fix listed | UBUNTU-CVE-2026-124852 |
| Ubuntu | 22.04:LTS | mozjs78, mozjs91, mozjs102 and 1 more | no fix listed | UBUNTU-CVE-2026-124852 |
| Ubuntu | 24.04:LTS | mozjs102, mozjs115 | no fix listed | UBUNTU-CVE-2026-124852 |
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.
Attack patterns (CAPEC)
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits. More on the page of CWE-120 (13).
History
- Scored 8.8 high
- The NVD deferred its analysis
Changes since this site first stored the record. The same for every record: /api/public/changes.