SecuriTricks - CVE-2026-12299

Description

JIT miscompilation in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37.

Product(s) Impacted

Vendor	Product	Versions
Mozilla	Firefox Firefox Esr	152 140.12, 115.37

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-843

Access of Resource Using Incompatible Type ('Type Confusion')

The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	mozilla	firefox	152	/	/	/	/	/	/	/
a	mozilla	firefox_esr	140.12	/	/	/	/	/	/	/
a	mozilla	firefox_esr	115.37	/	/	/	/	/	/	/

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2043139

https://www.mozilla.org/security/advisories/mfsa2026-57/

https://www.mozilla.org/security/advisories/mfsa2026-58/

https://www.mozilla.org/security/advisories/mfsa2026-59/

CVSS Score

5.4 / 10

CVSS Data - 3.1

Attack Vector: NETWORK
Attack Complexity: LOW
Privileges Required: NONE
Scope: UNCHANGED
Confidentiality Impact: LOW
Integrity Impact: LOW
Availability Impact: NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

View Vector String

Timeline

Published: June 16, 2026, 1:16 p.m.
Last Modified: June 16, 2026, 3:16 p.m.

Status : Undergoing Analysis

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

CVE-2026-12299