CVE-2026-84126 :: Enginsight Vulnerability Database

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
mozilla	CNA	4.3 MEDIUM	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Base Score

CVSS 3.x

EPSS Score

Percentile: 22.48%

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
mozilla	firefox	𝑥 < 155.0.0	CNA
mozilla	thunderbird	𝑥 < 155.0	CNA

Debian Releases

Debian Product

Codename

firefox

sid	157.0.1-1 fixed

Ubuntu Releases

Ubuntu Product

Codename

firefox

jammy	not-affected
noble	not-affected
resolute	not-affected

thunderbird

jammy	needed
noble	not-affected
resolute	not-affected

mozjs38

bionic	needs-triage
jammy	dne
noble	dne
resolute	dne

mozjs52

bionic	ignored
focal	ignored
jammy	dne
noble	dne
resolute	dne

mozjs68

focal	ignored
jammy	dne
noble	dne
resolute	dne

mozjs78

jammy	ignored
noble	dne
resolute	dne

mozjs91

jammy	ignored
noble	dne
resolute	dne

mozjs102

jammy	ignored
noble	ignored
resolute	dne

mozjs115

jammy	dne
noble	ignored
resolute	dne

Common Weakness Enumeration

CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
The program copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2063893

https://www.mozilla.org/security/advisories/mfsa2026-82/

https://www.mozilla.org/security/advisories/mfsa2026-86/