CVE-2026-2767Disclosure(mozilla / firefox)

LOWCVSS 9.8 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch mozilla firefox systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

Use-after-free in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

mozilla CVEs Back to dashboard

0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories

Other references

Weakness type (CWE)

CWE-416

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

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
5 mentions across 4 observed days
Momentum state: stable

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 5 signals
Disclosure: 4 classified signals
Peaked 3d ago at 2 mentions (2026-02-25); latest day: 1
5 total mentions across 4 days

Affected systems

Vendors

mozilla

Products

firefoxthunderbird

Deep dive

Activity timeline5 mentions / 4d

Signal classification2 categories

Disclosure

480.0%

Patch

120.0%

Referenced assets3 URLs

By indicator

Classification over time

Date	Total	Labels

2026-02-25	2	Disclosure2
2026-02-28	1	Disclosure1
2026-03-01	1	Disclosure1
2026-04-16	1	Patch1

Full discourse5 posts

Giuseppe Paternicola@giuseppe_1337175d
Patch
```json { "x": "🚨 CRITICAL: CVE-2026-2767 (CVSS 9.8) - Use-after-free in Firefox/Thunderbird WebAssembly. Remotely exploitable, no user interaction required. Patch NOW to Firefox 148, ESR 140.8, Thunderbird 148/140.8. https://t.co/ZgnKYmmipV
Post summary
The tweet announces CVE-2026-2767, a critical use‑after‑free flaw affecting Firefox/Thunderbird WebAssembly with CVSS 9.8, and urges users to immediately apply the latest patches.
0000028
25 followersView on X
CRAC Learning - Tech@cracbot221d
Disclosure
CVE-2026-2767 (CVSS:9.8, CRITICAL) is Modified. Use-after-free in the JavaScript: WebAssembly component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, ..https://nvd.nist.gov/vuln/detail/CVE-2026-2767 #cybersecurityawareness #cybersecurity #CVE #infosec #hacker #nvd #mitre
Post summary
The post announces a critical use‑after‑free vulnerability in Firefox’s WebAssembly component, providing CVSS score, affected versions, and a link to the NVD entry.
0000031
173 followersView on X
CRAC Learning - Tech@cracbot222d
Disclosure
CVE-2026-2767 (CVSS:9.8, CRITICAL) is Modified. Use-after-free in the JavaScript: WebAssembly component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, ..https://nvd.nist.gov/vuln/detail/CVE-2026-2767 #cybersecurityawareness #cybersecurity #CVE #infosec #hacker #nvd #mitre
Post summary
CVE-2026-2767 is a critical use‑after‑free vulnerability in Firefox’s WebAssembly component, affecting versions below 148 and ESR below 140.8.
0000039
173 followersView on X
Infoflowcloud@infoflowcloud225d
Disclosure
🚨*CVE* CVE-2026-2767 Use-after-free in the JavaScript: WebAssembly component. This vulnerability affects Firefox < 148 and Firefox ESR < 140.8. https://www.cve.org/CVERecord?id=CVE-2026-2767 ----- Traducción: CVE-2026-2767 Uso de memoria ya liberada en el componente JavaScr… http://infoflow.cloud`
Post summary
The post announces CVE-2026-2767, a use‑after‑free bug in Firefox’s WebAssembly component affecting versions below 148 and ESR 140.8, and links to the official CVE record.
0000052
54 followersView on X
CVE@CVEnew225d
Disclosure
CVE-2026-2767 Use-after-free in the JavaScript: WebAssembly component. This vulnerability affects Firefox < 148 and Firefox ESR < 140.8. https://www.cve.org/CVERecord?id=CVE-2026-2767
Post summary
A use‑after‑free vulnerability (CVE‑2026‑2767) in Firefox’s WebAssembly component affecting versions below 148 and ESR below 140.8 is disclosed, with no PoC, exploit, or patch details provided.
00000791
56.6K 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	-	-	-

Explore more

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What researchers are saying

CVE-2026-2767

Giuseppe Paternicola[verified]@giuseppe_1337Patch

The tweet announces CVE-2026-2767, a critical use‑after‑free flaw affecting Firefox/Thunderbird WebAssembly with CVSS 9.8, and urges users to immediately apply the latest patches.

CRAC Learning - Tech@cracbotDisclosure

The post announces a critical use‑after‑free vulnerability in Firefox’s WebAssembly component, providing CVSS score, affected versions, and a link to the NVD entry.

CRAC Learning - Tech@cracbotDisclosure

CVE-2026-2767 is a critical use‑after‑free vulnerability in Firefox’s WebAssembly component, affecting versions below 148 and ESR below 140.8.

Infoflowcloud@infoflowcloudDisclosure

The post announces CVE-2026-2767, a use‑after‑free bug in Firefox’s WebAssembly component affecting versions below 148 and ESR 140.8, and links to the official CVE record.

CVE@CVEnewDisclosure

A use‑after‑free vulnerability (CVE‑2026‑2767) in Firefox’s WebAssembly component affecting versions below 148 and ESR below 140.8 is disclosed, with no PoC, exploit, or patch details provided.