Not yet scoredPublished Oct 27, 2026

CVE-2026-118023Sandbox escape due to use-after-free in the Graphics: WebRender component

Updated under an hour ago (Oct 29, 2026, 2:40 PM ET)

Does this affect you?

It affects Mozilla Firefox and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stackFree account, 3 products Every CVE for Mozilla Firefox Exploited in the last 30 days

Sandbox escape due to use-after-free in the Graphics: WebRender component. This vulnerability was fixed in Firefox 159 and Thunderbird 159.

CVSS: Not yet scored
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mozilla
NVD analysis: Deferred
Record last updated: Oct 27, 2026
First seen by InfoSec Signals: Oct 27, 2026

Affected products

Affected products

Mozilla Firefox mozilla:firefox (from the name)	from 159 not affected	CNA record
Mozilla Thunderbird mozilla:thunderbird (from the name)	from 159 not affected	CNA record

References

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2079499
https://www.mozilla.org/security/advisories/mfsa2026-118/
https://www.mozilla.org/security/advisories/mfsa2026-121/

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.