Network Vulnerability in Firefox Browser by Mozilla
CVE-2026-2779

9.8CRITICAL

Key Information:

Vendor

Mozilla
Status
Firefox
Firefox Esr
Thunderbird
Vendor
CVE Published:
24 February 2026

What is CVE-2026-2779?

The vulnerability in the Networking: JAR component of the Firefox browser arises from incorrect boundary conditions. This flaw compromises the security of affected versions, leading to potential exploitation. Users of Firefox versions prior to 148 and Firefox ESR versions preceding 140.8 are urged to update their browsers immediately to mitigate risks associated with this vulnerability.

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Affected Version(s)

Firefox < 148

Firefox ESR < 140.8

Thunderbird < 148

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1164141
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-15/

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

Alex Mayorga
JSON
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