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  4. CVE 2026 124917 sandbox escape due to use after free in the
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Back to active CVEs
Critical · CVSS 9.6CVE-2026-124917

Sandbox escape due to use-after-free in the Widget: Gtk componentCVE-2026-124917

Answer in brief

CVE-2026-124917 records a Critical severity (CVSS 9.6) vulnerability in Sandbox escape due to use-after-free in the Widget: Gtk component. The current sources do not mark it as known exploited. Affected software not mapped in the current feed; confirm the named product and version against your inventory.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 10, 2026Updated Nov 10, 2026Source checked Nov 10, 2026First seen by HOL Nov 10, 2026Material review Nov 10, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.6
Exploitation
Not marked as known exploited
Affected software
Not mapped
Fix availability
Not reported

Why this deserves its current priority

CVSS is 9.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

Affected software not mapped in the current feed; confirm the named product and version against your inventory.

Recommended response

  1. 1Confirm exposure. Identify whether the named product or interface exists in your inventory, then review the linked upstream references for affected versions and vendor guidance.

Evidence timeline and material changes

  1. Published upstream

    Nov 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 10, 2026

Sources and claim methodology

  • Source referencebugzilla.mozilla.org
  • Source referencemozilla.org
  • Source referencemozilla.org
Upstream source description

Sandbox escape due to use-after-free in the Widget: Gtk component. This vulnerability was fixed in Firefox 160 and Firefox ESR 153.7.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Nov 10, 2026
References
3 linked sources
Open source record