CVE-2026-117866
published 2026-10-27CVE-2026-117866: Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR…
PriorityP427
EPSS
0.19%
8.3th percentile
Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 159 | Firefox 159 |
| mozilla | firefox_esr | < Firefox ESR 153.6 | Firefox ESR 153.6 |
| mozilla | firefox_esr | < Firefox ESR 115.44 | Firefox ESR 115.44 |
| mozilla | thunderbird | < Thunderbird 159 | Thunderbird 159 |
| mozilla | thunderbird | < Thunderbird 153.6 | Thunderbird 153.6 |
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Mozilla
Mozilla Foundation Security Advisory 2026-121: CVE-2026-117866
vendor_mozilla
CVE-2026-117866 Mozilla Foundation Security Advisory 2026-121: CVE-2026-117866
Mozilla Foundation Security Advisory 2026-121
CVE: CVE-2026-117866
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 159
Mozilla
Mozilla Foundation Security Advisory 2026-120: CVE-2026-117866
vendor_mozilla
CVE-2026-117866 Mozilla Foundation Security Advisory 2026-120: CVE-2026-117866
Mozilla Foundation Security Advisory 2026-120
CVE: CVE-2026-117866
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 153.6
Mozilla
Mozilla Foundation Security Advisory 2026-119: CVE-2026-117866
vendor_mozilla
CVE-2026-117866 Mozilla Foundation Security Advisory 2026-119: CVE-2026-117866
Mozilla Foundation Security Advisory 2026-119
CVE: CVE-2026-117866
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 115.44
Mozilla
Mozilla Foundation Security Advisory 2026-122: CVE-2026-117866
vendor_mozilla
CVE-2026-117866 Mozilla Foundation Security Advisory 2026-122: CVE-2026-117866
Mozilla Foundation Security Advisory 2026-122
CVE: CVE-2026-117866
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 153.6
Mozilla
Mozilla Foundation Security Advisory 2026-118: CVE-2026-117866
vendor_mozilla
CVE-2026-117866 Mozilla Foundation Security Advisory 2026-118: CVE-2026-117866
Mozilla Foundation Security Advisory 2026-118
CVE: CVE-2026-117866
Product: Firefox
Impact: low
Fixed in: Firefox 159
GHSA
Privilege escalation due to use-after-free in the Graphics: Canvas2D component.
ghsa_unreviewed·2026-10-27
CVE-2026-117866 Privilege escalation due to use-after-free in the Graphics: Canvas2D component.
Privilege escalation due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=2059011https://www.mozilla.org/security/advisories/mfsa2026-118/https://www.mozilla.org/security/advisories/mfsa2026-119/https://www.mozilla.org/security/advisories/mfsa2026-120/https://www.mozilla.org/security/advisories/mfsa2026-121/https://www.mozilla.org/security/advisories/mfsa2026-122/
2026-10-27
Published