VulnSocial

CVE-2026-4702Disclosure(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

JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

mozilla CVEsBack to dashboard
0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-843

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

Threat summary

  • Patch or workaround signal is available
  • 3 mentions across 3 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 3 signals
  • Disclosure: 2 classified signals
  • Peaked 2d ago at 1 mentions (2026-03-24); latest day: 1
  • 3 total mentions across 3 days

Affected systems

Vendors
mozilla
Products
firefox

Deep dive

Activity timeline3 mentions / 3d
00111Mentions · 2026-03-24: 1Mentions · 2026-03-25: 1Mentions · 2026-04-17: 1Patch / Workaround · 2026-04-17: 1Technical Details · 2026-03-24: 1Technical Details · 2026-03-25: 1Technical Details · 2026-04-17: 103-2403-2504-17
Signal classification2 categories
Disclosure
266.7%
Patch
133.3%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-03-241
Disclosure1
2026-03-251
Disclosure1
2026-04-171
Patch1
Full discourse3 posts
  • Giuseppe Paternicola@giuseppe_1337
    Patch

    ```json { "x": "🚨 CRITICAL: CVE-2026-4702 (CVSS 9.8) - JIT miscompilation in Firefox JavaScript Engine. Network exploitable, no user interaction required. Patch NOW: Firefox 149, ESR 140.9, Thunderbird 149/140.9. https://t.co/GKyfccWz4i

    Post summary

    A critical JIT miscompilation vulnerability (CVE‑2026‑4702) affecting Firefox’s JavaScript engine is network‑exploitable, and the vendor has issued immediate patches for current releases.

    0000037
    25 followersView on X
  • The Hacker Wire@TheHackerWire
    Disclosure

    🔴 CVE-2026-4702 - Critical JIT miscompilation in the JavaScript Engine component. This vulnerability affects Firefox < 149, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9. https://www.thehackerwire.com/vulnerability/CVE-2026-4702/ https://t.co/gkkrUu3Cd3

    Post summary

    A critical JIT miscompilation vulnerability (CVE-2026-4702) affecting older Firefox and Thunderbird versions has been disclosed, with technical details and a link to further information.

    0000062
    145 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-4702 JIT miscompilation in the JavaScript Engine component. This vulnerability affects Firefox < 149 and Firefox ESR < 140.9. https://www.cve.org/CVERecord?id=CVE-2026-4702

    Post summary

    The snippet announces CVE-2026-4702 as a JIT miscompilation affecting specific Firefox releases, providing basic technical details but no evidence of PoC, exploit code, active exploitation, or patches.

    00000112
    56.8K followersView on X
CPE platform detail2 entries

2 of 2 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox---
Appmozillafirefox---

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