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CVE-2026-24869 Mozilla CVE debrief

CVE-2026-24869 is a high-severity vulnerability in the Mozilla Firefox browser. It is a use-after-free issue in the Layout: Scrolling and Overflow component. The vulnerability was publicly disclosed on January 27, 2026, and was modified on June 30, 2026. The issue was fixed in Firefox version 147.0.2. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 8.8, indicating a high severity level. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Vendor
Mozilla
Product
Firefox
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-27
Original CVE updated
2026-07-15
Advisory published
2026-01-27
Advisory updated
2026-07-15

Who should care

This vulnerability affects users of Mozilla Firefox. Specifically, any user of Firefox prior to version 147.0.2 is potentially vulnerable to this issue. Organizations and individuals who use Firefox for browsing the internet should prioritize updating to the latest version to mitigate the risk associated with this vulnerability.

Technical summary

The CVE-2026-24869 vulnerability is a use-after-free issue in the Layout: Scrolling and Overflow component of Firefox. This type of vulnerability occurs when a program attempts to use memory after it has been freed or deleted. This can lead to unpredictable behavior, crashes, or, in the case of vulnerabilities like this, potentially allow an attacker to execute arbitrary code. The vulnerability was assigned a CVSS score of 8.8, indicating high severity. The vulnerability was publicly disclosed on January 27, 2026.

Defensive priority

High priority should be given to updating Firefox to version 147.0.2 or later to mitigate this vulnerability. Given the high CVSS score of 8.8, indicating high severity, defenders should treat this as a critical update.

Recommended defensive actions

  • Update Firefox to version 147.0.2 or later immediately.
  • Ensure all Firefox installations within the organization are updated.
  • Monitor Firefox installations for compliance with the updated version.
  • Consider implementing a vulnerability management process to ensure timely updates of critical software.
  • Review and update incident response plans to include procedures for rapid deployment of patches for high-severity vulnerabilities.

Evidence notes

The CVE-2026-24869 vulnerability was publicly disclosed on January 27, 2026, with a CVSS score of 8.8. It affects Firefox versions prior to 147.0.2. The vulnerability is a use-after-free issue in the Layout: Scrolling and Overflow component. The Common Weakness Enumeration (CWE) for this vulnerability is CWE-416. The vulnerability was fixed in Firefox version 147.0.2.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-24869 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-24869

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-24869 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-24869

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Mitigation or vendor reference

    Unverified legacy reference

    URL: https://www.mozilla.org/security/advisories/mfsa2026-06/

    [email protected] - Vendor Advisory

  • Source reference

    Unverified legacy reference

    URL: https://access.redhat.com/security/cve/CVE-2026-24869

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

  • Source reference

    Unverified legacy reference

    URL: https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24869.json

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.