CVE-2026-8949
Integer overflow in the Widget: Win32 component
HIGH
7.5
CVSS Score
Published: May 19, 2026 at 12:29 PM UTC
Updated: October 14, 2026 at 08:10 PM UTC
2 products affected across 1 vendorFirefoxThunderbird
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Severity
HIGH7.5
Exploit prediction
EPSS 0.6%
SSVC
No known exploit
Description
Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 140.11.0v < 151.0.0
Vendor states this is fixed in 140.11 (unaffected)
Vendor states this is fixed in 151 (unaffected)
v < 140.11v < 151.0.0
Vendor states this is fixed in 140.11 (unaffected)
Vendor states this is fixed in 151 (unaffected)
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (5)
SSVC — 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
StatusANALYZED
CWE
CWE-190
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