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CVE-2026-6758

Use-after-free in the JavaScript: WebAssembly component

Published: Apr 21, 2026Updated: Apr 21, 2026 Sources: CVE List NVD
NVD MITRE
7.5CVSS
HIGH

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 150.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High

Weaknesses

CWE-416

Affected Products

Firefox
Mozilla

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2013619
bugzilla.mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-30/
mozilla.org

Timeline

Published
Apr 21, 2026
Last Updated
Apr 21, 2026

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