CVE-2026-12299
5.4 MEDIUMJIT miscompilation in the DOM: Core & HTML component
Published: 2026-06-16 · Last updated: 2026-06-16
Severity and scoring
- CVSS
- 5.4 MEDIUM
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- CWE
- CWE-843
Affected products
| Vendor | Product |
|---|---|
| mozilla | firefox, thunderbird |
Description
JIT miscompilation in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-12299
- [Other]https://bugzilla.mozilla.org/show_bug.cgi?id=2043139
- [Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-57/
- [Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-58/
- [Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-59/
- [Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-60/
- [Vendor advisory]https://www.mozilla.org/security/advisories/mfsa2026-61/
Related CVEs
Same vendor
- CVE-2026-12330 — Incorrect boundary conditions in the Internationalization component (5.4 MEDIUM)
- CVE-2026-12329 — Memory safety bug fixed in Thunderbird ESR 140.12 (5.3 MEDIUM)
- CVE-2026-12328 — Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151 (8.1 HIGH)
- CVE-2026-12323 — Spoofing issue in the DOM: Core & HTML component (5.4 MEDIUM)
- CVE-2026-12322 — Clickjacking issue in the Widget: Gtk component (5.4 MEDIUM)
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- CVE-2026-45635 — Use after free in Universal Plug and Play (upnp.dll) allows an unauthorized attacker to execute code over a network (8.1 HIGH)
- CVE-2026-45600 — Access of resource using incompatible type ('type confusion') in Windows Kernel-Mode Drivers allows an authorized attacker to elevate pri... (7.8 HIGH)