How severe is CVE-2026-24869?

CVE-2026-24869 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-24869 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-24869?

CVE-2026-24869 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-24869?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-24869 have an EU (EUVD) identifier?

Yes. CVE-2026-24869 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4814.

When was CVE-2026-24869 published?

CVE-2026-24869 was published on 2026-01-27 and last updated on 2026-06-30.

CVE-2026-24869

CVE-2026-24869 is a high-severity vulnerability in Mozilla Firefox with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-416.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-4814
Weakness: CWE-416
Affected product: Mozilla Firefox
Published: 2026-01-27
Last modified: 2026-06-30

Description

Use-after-free in the Layout: Scrolling and Overflow component. This vulnerability was fixed in Firefox 147.0.2.

Frequently asked questions

What is CVE-2026-24869?: Use-after-free in the Layout: Scrolling and Overflow component. This vulnerability was fixed in Firefox 147.0.2.
How severe is CVE-2026-24869?: CVE-2026-24869 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-24869 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-24869?: CVE-2026-24869 affects Mozilla Firefox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-24869?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-24869 have an EU (EUVD) identifier?: Yes. CVE-2026-24869 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4814.
When was CVE-2026-24869 published?: CVE-2026-24869 was published on 2026-01-27 and last updated on 2026-06-30.

References

Affected products (1)

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

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Other CWE-416 (Use After Free) vulnerabilities

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CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…
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