Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.
VOLERION
Volerion Security Research

NOT DEFERRED DATABASE

VULNERABILITIES

CVE-2026-12291 Details

Description

Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: redhat-SADPCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URLSource(s)Tag(s)
https://access.redhat.com/errata/RHSA-2026:27717 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:27733 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:27734 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:29940 redhat-SADP
https://access.redhat.com/errata/RHSA-2026:30846 redhat-SADP

see all 30 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-416Use After FreeCISA-ADP
CWE-825Expired Pointer Dereferenceredhat-SADP

Affected Products

ProductVersions
mozilla firefox
< 115.37.0
< 152.0.0
>= 128.0, < 140.12.0

CPE

  • cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*

Remediation

  • No remediation found in references.
mozilla thunderbird
< 140.12.0
< 152.0.0

CPE

  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

Remediation

  • No remediation found in references.

Change History

14 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-12291
NVD Published Date:
Jun 16, 2026
NVD Last Modified:
Jul 15, 2026
Source:
[email protected]
CVE-2026-12291 Details - Not Deferred