CVE-2026-100794(mozilla / firefox)

LOWCVSS 9.6 · CRITICAL

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

Sandbox escape due to incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.

0.0/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-119

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

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

  • 1 mentions across 1 observed day

What's happening

  • 1 total mentions across 1 day

Affected systems

Vendors
Products
firefoxthunderbird

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-10-26: 110-26
Full discourse1 post
  • DFIR Lab@DFIR_Lab

    🚨 CRITICAL: CVE-2026-100794 (CVSS 9.6) Sandbox escape in Firefox/Thunderbird Internationalization component. Network exploitable, no privileges required. Patched in Firefox 157, Firefox ESR 153.4/140.17, Thunderbird 157/153.4/140.17. #CVE #PatchNow https://t.co/xP1McGCOG7

    0000047
    154 followersView on X
CPE platform detail2 entries

2 of 2 entries

PartVendorProductVersionTarget SWTarget HW
Appmozillafirefox---
Appmozillathunderbird---

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