Regular expression denial of service via installing themes via git in discourse
Published Feb 8, 2023 · Updated Oct 23, 2026 · Also known as GHSA-4w55-w26q-r35w, BIT-discourse-2023-25167
Original summary
Normalized public record · Updated Oct 23, 2026
Regular expression denial of service via installing themes via git in discourse
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
Discourse is an open source discussion platform. In affected versions a malicious user can cause a regular expression denial of service using a carefully crafted git URL. This issue is patched in the latest stable, beta and tests-passed versions of Discourse. Users are advised to upgrade. There are no known workarounds for this issue.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix 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.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- LOW
- Confidence
- Not available
- Aliases
- GHSA-4w55-w26q-r35w, BIT-discourse-2023-25167
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
Record history
Published Feb 8, 2023 · Last refreshed Oct 23, 2026