CVE-2026-8949Disclosure(mozilla / firefox)

LOWCVSS 7.5 · HIGH

Signal is active with 2 mentions in latest observed window

Immediate actions

Patch mozilla firefox systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

mozilla CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories

Other references

https://bugzilla.mozilla.org/show_bug.cgi?id=1355639

Weakness type (CWE)

CWE-190

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

firefox
thunderbird

Threat summary

Patch or workaround signal is available
2 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 2 signals
Technical details provided in 2 signals
Disclosure: 1 classified signal
2 total mentions across 1 day

Affected systems

Vendors

mozilla

Products

firefoxthunderbird

Deep dive

Activity timeline2 mentions / 1d

Signal classification2 categories

Disclosure

150.0%

Patch

150.0%

Referenced assets2 URLs

By indicator

Full discourse2 posts

Infoflowcloud@infoflowcloud143d
Disclosure
🚨*CVE* CVE-2026-8949 Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11. https://www.cve.org/CVERecord?id=CVE-2026-8949 ----- Traducción: CVE-2026-8949 Desbordamiento de e… http://infoflow.cloud`
Post summary
The tweet announces CVE-2026-8949, an integer‑overflow flaw in a Win32 component, and notes that the issue has been fixed in specific Firefox and Thunderbird releases.
0000056
78 followersView on X
CVE@CVEnew143d
Patch
CVE-2026-8949 Integer overflow in the Widget: Win32 component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11. https://www.cve.org/CVERecord?id=CVE-2026-8949
Post summary
CVE-2026-8949 is an integer overflow in Firefox's Widget component, already fixed in recent releases of Firefox and Thunderbird, with no PoC, exploit code, or active exploitation reported.
00000207
57.5K followersView on X

CPE platform detail4 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

4 of 4 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	mozilla	firefox	-	-	-
App	mozilla	firefox	-	-	-
App	mozilla	thunderbird	-	-	-
App	mozilla	thunderbird	-	-	-

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