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Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-2799

CVE-2026-2799

HIGH8.8

Use-after-free in the DOM: Core & HTML component

Published Feb 24, 2026

Modified 6 days ago

Fix available

Details

Use-after-free in the DOM: Core & HTML component. This vulnerability affects Firefox < 148 and Thunderbird < 148.

Affected Packages

Firefox

Ubuntu 14.04 LTSUbuntu 16.04 LTSUbuntu 18.04 LTSUbuntu 20.04 LTSUbuntu 22.04 LTS

Fixed in:

148

Mozilla Firefox

Windows 10 (1507)Windows 10 (1607) / Server 2016Windows 10 (1809) / Server 2019Windows 10 (1903)Windows 10 (1909)

Fixed in:

148

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2014551

https://www.cve.org/CVERecord?id=CVE-2026-2799

https://www.mozilla.org/security/advisories/mfsa2026-13/

https://www.mozilla.org/security/advisories/mfsa2026-16/

CVSS Analysis

CVSS v3.1

8.8

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

RequiredUI:R

Scope

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

HighA:H

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

Ecosystems(28)

Ubuntu 14.04 LTS Ubuntu 16.04 LTS Ubuntu 18.04 LTS Ubuntu 20.04 LTS Ubuntu 22.04 LTS

Timeline

PublishedFeb 24, 2026

ModifiedFeb 26, 2026

CVE-2026-2799 | Mondoo Vulnerability Intelligence