CVE-2026-6758Disclosure(mozilla / firefox)

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

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 150 and Thunderbird 150.

0.0/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-416

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

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

  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Technical details provided in 1 signal
  • Disclosure: 1 classified signal
  • General: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-04-21); latest day: 1
  • 2 total mentions across 2 days

Affected systems

Vendors
Products
firefoxthunderbird

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-04-21: 1Mentions · 2026-04-23: 1Technical Details · 2026-04-21: 104-2104-23
Signal classification2 categories
Disclosure
150.0%
General
150.0%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-04-211
Disclosure1
2026-04-231
General1
Full discourse2 posts
  • Alfonso Fuggetta@AlfonsoFuggetta
    General

    “Three of the vulnerabilities were specifically credited to Anthropic's Claude AI. These were CVE-2026-6746, CVE-2026-6757, and CVE-2026-6758. Among them, the first was rated as high severity, while the other two were rated as medium.”

    Post summary

    The tweet simply lists three CVEs attributed to Anthropic's Claude AI and assigns generic severity ratings without providing any technical or operational details.

    100501.1K
    29.1K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-6758 Use-After-Free in Firefox JavaScript WebAssembly Component Before Version... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-6758 Vulnerability Notification: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=3

    Post summary

    A new use‑after‑free vulnerability (CVE‑2026‑6758) affecting Firefox’s WebAssembly component has been disclosed, with links to detailed notices and a vulnerability notification.

    0000038
    4.0K followersView on X
CPE platform detail2 entries

2 of 2 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox---
Appmozillathunderbird---

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