CVE-2026-24869Public exploitNetwork attack vector

Tab crash via invalidated anchor-scroll hash reference

Published Jan 27, 2026 · Updated Jan 27, 2026

Use-after-free in Firefox before 147.0.2 allows remote attackers to crash a tab via crafted pages with moving anchor-positioned elements. ShouldAsyncScrollWithAnchor retains a reference to an AsyncScrollsWithAnchorHashmap entry while a nested frame-tree walk can mutate the table and invalidate that reference. A victim must interact with a crafted page; the public testcase demonstrates a tab crash, while Mozilla documents no code execution or data access.

CVSS severity8.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Firefox before 147.0.2 allows remote attackers to crash a tab via crafted pages with moving anchor-positioned elements. ShouldAsyncScrollWithAnchor retains a reference to an AsyncScrollsWithAnchorHashmap entry while a nested frame-tree walk can mutate the table and invalidate that reference. A victim must interact with a crafted page; the public testcase demonstrates a tab crash, while Mozilla documents no code execution or data access.

The record

CVE
CVE-2026-24869
Published
Jan 27, 2026
Updated
Jan 27, 2026
Vendor
Mozilla
Product
Firefox
Classifications
CWE-416, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <147.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <147.0.2

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.5Red HatCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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