Memory Corruption Vulnerability in Firefox by Mozilla
CVE-2025-49709

9.8CRITICAL

Key Information:

Vendor

Mozilla
Status
Firefox
Vendor
CVE Published:
11 June 2025

What is CVE-2025-49709?

A memory corruption vulnerability exists in Firefox prior to version 139.0.4, where certain canvas operations could potentially lead to unexpected behaviors and security risks. Users are encouraged to update to the latest version to mitigate potential threats.

Affected Version(s)

Firefox < 139.0.4

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1966083
https://www.mozilla.org/security/advisories/mfsa2025-47/

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Yannis Juglaret and Steven Michaud
.
CVE-2025-49709 : Memory Corruption Vulnerability in Firefox by Mozilla