VulnSocial

CVE-2026-12321Patch(mozilla / firefox)

LOWCVSS 5.4 · MEDIUM

Signal is active with 3 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: WebAssembly component. This vulnerability was fixed in Firefox 152 and Thunderbird 152.

mozilla CVEsBack to dashboard
0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-670

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
  • 3 mentions across 1 observed day

What's happening

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

Affected systems

Vendors
mozilla
Products
firefoxthunderbird

Deep dive

Activity timeline3 mentions / 1d
01223Mentions · 2026-06-16: 3Patch / Workaround · 2026-06-16: 2Technical Details · 2026-06-16: 206-16
Signal classification2 categories
Patch
266.7%
General
133.3%
Referenced assets3 URLs
Full discourse3 posts
  • Infoflowcloud@infoflowcloud
    Patch

    🚨*CVE* CVE-2026-12321 JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 152 and Thunderbird 152. https://www.cve.org/CVERecord?id=CVE-2026-12321 ----- Traducción: CVE-2026-12321: mala compilación JIT en el componente JavaScr… http://infoflow.cloud`

    Post summary

    The text announces CVE‑2026‑12321, a JIT miscompilation in WebAssembly, and notes that it has been fixed in Firefox 152 and Thunderbird 152.

    0000027
    82 followersView on X
  • CVE@CVEnew
    Patch

    CVE-2026-12321 JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 152 and Thunderbird 152. https://www.cve.org/CVERecord?id=CVE-2026-12321

    Post summary

    CVE-2026-12321 is a JIT miscompilation in the JavaScript WebAssembly component, fixed in Firefox and Thunderbird 152; no PoC or active exploitation details are provided.

    00000257
    57.6K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    General

    CVE-2026-12321 JIT Miscompilation in Firefox JavaScript WebAssembly Component https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-12321

    Post summary

    The post announces a new CVE (CVE‑2026‑12321) involving a JIT miscompilation in Firefox’s WebAssembly component, providing only a brief description and a link to a vulnerability details page.

    0000039
    4.0K followersView on X
CPE platform detail2 entries

2 of 2 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox---
Appmozillathunderbird---

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