CVE-2026-12290 | BDVDB-2026-340694 Detail

MozillaFirefox

Description#

Memory safety bug fixed in Thunderbird 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact none. Attack vector: network.

Weaknesses#

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-823 Use of Out-of-range Pointer Offset

References#

Show all 30

Exploit#

No public exploit known

History#

Version 12026-06-16Record published in the CVE List.
Version 22026-10-21Most recent update recorded in the CVE List.

Published

Published: 2026-06-16
Last modified: 2026-10-21

Vendor information

Vendor: Mozilla
Product: Firefox

All Mozilla vulnerabilities

Score

8.1 High

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 34.2.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Memory Corruption

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
Not stated
Fixed
115.37
Vulnerable
Not stated
Fixed
140.12
Vulnerable
Not stated
Fixed
152

Scoring System

CVSS v4.0

Not available

CVSS v3.1

8.1 High

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).