CVE-2026-6747Public exploitNetwork attack vectorHinoki check available

Crash via undetached encoded-frame ArrayBuffers

Published Apr 21, 2026 · Updated Jul 15, 2026

Use-after-free in Firefox's WebRTC component on Red Hat Enterprise Linux allows remote attackers to crash the browser via web content. RTCEncodedAudioFrame and RTCEncodedVideoFrame destructors clear the buffer reference before detachment, leaving JavaScript ArrayBuffers pointing to freed frame memory. Triggering requires attacker-controlled script execution and media.peerconnection.scripttransform.enabled to be true; the public reproducer demonstrates a crash, not arbitrary code execution.

CVSS severity7.5

High

EPSS probability0.58%

Next 30 days · Oct 19, 2026

Known exploitationUnconfirmed

Based on sourced intelligence

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Summary

What happened

The record

CVE: CVE-2026-6747
Published: Apr 21, 2026
Updated: Jul 15, 2026

Vendor: libuser Project
Product: Red Hat Enterprise Linux 9
Classifications: CWE-825, CWE-416

Attack vector: network
Privileges: unauthenticated

Timeline

How it unfolded

Apr 21, 2026CVE publishedPublication date reported by the CVE source.
Jul 15, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork

Required privilegesunauthenticated

What is affected?

libuser Project · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.

libuser Project · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

libuser Project · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.

libuser Project · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.

Published CVSS scores

8.8Amazon LinuxCVSS: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

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

7.5Oracle LinuxCVSS: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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026

Latest reporting daySep 28, 2026

Latest daily unique IPsUnavailable

Prior 30-day averageUnavailable

SourceShadowserver honeypots (KEV)

Vectornetwork

Privilegesunauthenticated

Known exploitationUnconfirmed

Public exploitPublished

Weakness, pattern, technique

CWE-825Expired Pointer Dereference

CWE-416Use After Free

Public exploit references

WebRTC encoded-frame ArrayBuffer crash reproducerproof of concept · demonstrated

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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