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Vulnerability record · public intelligence
CVE-2023-4578
UNKNOWN

Error reporting methods in SpiderMonkey could have triggered an Out of Memory Exception

Published Sep 11, 2023 · Updated Nov 3, 2026

Severity · CVSSUNKNOWN · Not scored
Known exploitationNot listed
EPSS / likelihood0.62%
QFinch risk scoreNot available

Original summary

Normalized public record · Updated Nov 3, 2026

Error reporting methods in SpiderMonkey could have triggered an Out of Memory Exception

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

When calling `JS::CheckRegExpSyntax` a Syntax Error could have been set which would end in calling `convertToRuntimeErrorAndClear`. A path in the function could attempt to allocate memory when none is available which would have caused a newly created Out of Memory exception to be mishandled as a Syntax Error. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 115.2.

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

FIRST-EPSSCVE-LIST-V5
SSVC priority
LOW
Confidence
Not available
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. bugzilla.mozilla.org ↗
  2. Security advisory ↗
  3. Security advisory ↗
  4. Security advisory ↗

Record history

Published Sep 11, 2023 · Last refreshed Nov 3, 2026

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