CVE-2023-4578
6.5
MEDIUM
CVSS 3.1
EPSS 0.11%
Description
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.
How to fix CVE-2023-4578
To remediate CVE-2023-4578, upgrade the affected package to a fixed version below.
- —upgrade to 115.2.0esr-1 or later
- —upgrade to 1:115.2.0-1 or later
Is CVE-2023-4578 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 115.2.0esr-1
- from 0, < 1:115.2.0-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |