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  4. CVE 2026 74938 mitigation bypass in the javascript gc component
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Back to active CVEs
Critical · CVSS 9.1CVE-2026-74938

Mitigation bypass in the JavaScript: GC component

Answer in brief

CVE-2026-74938 records a Critical severity (CVSS 9.1) vulnerability in Mitigation bypass in the JavaScript: GC 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 Aug 18, 2026Updated Aug 19, 2026Source checked Oct 2, 2026First seen by HOL Aug 18, 2026Material review Aug 19, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.1
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 9.1. 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.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*Not reportedNot reported
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*Not reportedNot reported
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*Not reportedNot reported
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*Not reportedNot reported

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

    Aug 18, 2026

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

  2. Source modified

    Aug 19, 2026

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

  3. First seen by HOL

    Aug 18, 2026

Sources and claim methodology

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

Mitigation bypass in the JavaScript: GC component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-693
Source
CVE List V5
Source checked
Oct 2, 2026
References
5 linked sources
Open source record