CVE-2026-2765Disclosure(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 Engine 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 3 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 2d ago at 3 mentions (2026-02-28); latest day: 1
5 total mentions across 3 days

Affected systems

Vendors

mozilla

Products

firefoxthunderbird

Deep dive

Activity timeline5 mentions / 3d

Signal classification2 categories

Disclosure

480.0%

Patch

120.0%

Referenced assets3 URLs

By indicator

Classification over time

Date	Total	Labels

2026-02-28	3	Disclosure3
2026-03-01	1	Disclosure1
2026-04-16	1	Patch1

Full discourse5 posts

CRAC Learning - Tech@cracbot222d
Disclosure
CVE-2026-2765 (CVSS:9.8, CRITICAL) is Modified. Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunde..https://nvd.nist.gov/vuln/detail/CVE-2026-2765 #cybersecurityawareness #cybersecurity #CVE #infosec #hacker #nvd #mitre
Post summary
The post discloses CVE‑2026‑2765, a critical use‑after‑free flaw in Firefox’s JavaScript engine, without mentioning PoC, exploit, or patch details.
0001038
173 followersView on X
Giuseppe Paternicola@giuseppe_1337175d
Patch
🚨 CRITICAL: CVE-2026-2765 (CVSS 9.8) - Use-after-free in Firefox/Thunderbird JavaScript Engine. Network exploitable, no user interaction required. Patch NOW to Firefox 148, ESR 140.8, Thunderbird 148/140.8. #CVE #PatchNow #ThreatIntel https://t.co/PzgaGnA5eI
Post summary
The tweet alerts that CVE-2026-2765 is a critical use‑after‑free vulnerability in Firefox/Thunderbird’s JavaScript engine and urges users to apply the recommended patch immediately.
0000038
25 followersView on X
CRAC Learning - Tech@cracbot221d
Disclosure
CVE-2026-2765 (CVSS:9.8, CRITICAL) is Modified. Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 148, Firefox ESR < 140.8, Thunde..https://nvd.nist.gov/vuln/detail/CVE-2026-2765 #cybersecurityawareness #cybersecurity #CVE #infosec #hacker #nvd #mitre
Post summary
The post announces CVE-2026-2765, a critical use‑after‑free flaw in Firefox’s JavaScript engine, listing affected versions and linking to the NVD entry.
0000029
173 followersView on X
Infoflowcloud@infoflowcloud222d
Disclosure
🚨*CVE* CVE-2026-2765 Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 148 and Firefox ESR < 140.8. https://www.cve.org/CVERecord?id=CVE-2026-2765 ----- Traducción: CVE-2026-2765 Uso después de liberar en el componente del motor de Java… http://infoflow.cloud`
Post summary
The post announces CVE‑2026‑2765, a use‑after‑free flaw in Firefox’s JavaScript engine affecting versions below 148 and ESR below 140.8, without mentioning PoC, exploit, or patch details.
0000044
55 followersView on X
CVE@CVEnew222d
Disclosure
CVE-2026-2765 Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 148 and Firefox ESR < 140.8. https://www.cve.org/CVERecord?id=CVE-2026-2765
Post summary
A use‑after‑free vulnerability (CVE‑2026‑2765) in Firefox’s JavaScript engine affecting versions below 148 and ESR below 140.8 is disclosed, with no PoC, exploit, or patch details provided.
00000381
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

Back to dashboard mozilla CVEs firefox vulnerabilities

What researchers are saying

CVE-2026-2765

Giuseppe Paternicola[verified]@giuseppe_1337Patch

The tweet alerts that CVE-2026-2765 is a critical use‑after‑free vulnerability in Firefox/Thunderbird’s JavaScript engine and urges users to apply the recommended patch immediately.

CRAC Learning - Tech@cracbotDisclosure

The post discloses CVE‑2026‑2765, a critical use‑after‑free flaw in Firefox’s JavaScript engine, without mentioning PoC, exploit, or patch details.

CRAC Learning - Tech@cracbotDisclosure

The post announces CVE-2026-2765, a critical use‑after‑free flaw in Firefox’s JavaScript engine, listing affected versions and linking to the NVD entry.

Infoflowcloud@infoflowcloudDisclosure

The post announces CVE‑2026‑2765, a use‑after‑free flaw in Firefox’s JavaScript engine affecting versions below 148 and ESR below 140.8, without mentioning PoC, exploit, or patch details.

CVE@CVEnewDisclosure

A use‑after‑free vulnerability (CVE‑2026‑2765) in Firefox’s JavaScript engine affecting versions below 148 and ESR below 140.8 is disclosed, with no PoC, exploit, or patch details provided.