Use-after-free Flaw in Firefox and Firefox ESR by Mozilla
CVE-2026-2770

8.8HIGH

Key Information:

Vendor

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

What is CVE-2026-2770?

This vulnerability, categorized as a use-after-free issue, occurs within the DOM: Bindings (WebIDL) component of Firefox. It allows maliciously crafted content to potentially exploit memory management flaws, leading to arbitrary code execution or the insertion of harmful scripts into the browser environment. The flaw can impact users of Firefox versions below 148, as well as those using specific Extended Support Release (ESR) versions. Users are encouraged to update their browsers to mitigate potential risks associated with this vulnerability.

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Affected Version(s)

Firefox < 148

Firefox ESR < 115.33

Firefox ESR < 140.8

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2014585
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-14/

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

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