CVE-2026-6747
Use-after-free in the WebRTC component
HIGH
7.5
CVSS Score
Published: April 21, 2026 at 12:40 PM UTC
Updated: October 26, 2026 at 10:10 PM UTC
3 products affected across 2 vendorsFirefoxThunderbirdEnterprise Linux
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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit
Description
Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 140.10.0v < 150.0
Vendor states this is fixed in 140.10 (unaffected)
Affected range stops below 140.10.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 150 (unaffected)
Affected range stops below 150.0, so it looks safe — our inference, not a vendor statement
v < 140.10.0
Vendor states this is fixed in 140.10 (unaffected)
Affected range stops below 140.10.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 150 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el10_0 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el10_1 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el10_2 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el8_10 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el8_4 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el8_6 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el8_8 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el9_0 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el9_2 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el9_4 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el9_6 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el9_7 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el9_8 (unaffected)
Vendor states this is fixed in 0:140.10.0-2.el7_9 (unaffected)
Vendor states this is fixed in 0:140.10.1-1.el9_8 (unaffected)
Vendor states this is fixed in 6 (unknown)
Vendor states this is fixed in 7 (unknown)
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (35)
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:10757Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:10766Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:10767SSVC — Action Prioritization
SSVCNo known exploitAutomatablePartial impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
7.5HIGHCISA-ADP
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-416CWE-825
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