VulnSocial

CVE-2026-4699Disclosure(mozilla / firefox)

LOWCVSS 7.5 · HIGH

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

Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, 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-754CWE-787

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

What's happening

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

Affected systems

Vendors
mozilla
Products
firefox

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-03-24: 1Mentions · 2026-04-17: 1Patch / Workaround · 2026-04-17: 1Technical Details · 2026-03-24: 1Technical Details · 2026-04-17: 103-2404-17
Signal classification2 categories
Disclosure
150.0%
Patch
150.0%
Referenced assets1 URL
By indicator
Classification over time
DateTotalLabels
2026-03-241
Disclosure1
2026-04-171
Patch1
Full discourse2 posts
  • Giuseppe Paternicola@giuseppe_1337
    Patch

    🚨 HIGH: CVE-2026-4699 (CVSS 7.5) - Boundary condition flaw in Firefox/Thunderbird text rendering. Network-exploitable, no auth required. Patch NOW to Firefox 149/ESR 115.34/140.9, Thunderbird 149/140.9. #CVE #PatchNow #ThreatIntel https://t.co/MQXBjKOedi

    Post summary

    A high‑severity boundary condition flaw in Firefox/Thunderbird text rendering allows unauthenticated network exploitation; official patches are available for the listed browser versions.

    0000035
    25 followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-4699 Incorrect boundary conditions in the Layout: Text and Fonts component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. https://www.cve.org/CVERecord?id=CVE-2026-4699

    Post summary

    A new Firefox vulnerability, CVE-2026-4699, has been disclosed. It affects Firefox prior to version 149 and ESR 115.34/140.9, stemming from incorrect boundary conditions in the Layout: Text and Fonts component.

    00000113
    56.8K followersView on X
CPE platform detail2 entries

2 of 2 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox---
Appmozillafirefox---

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