What is CVE-2023-25167?

CVE-2023-25167 is a medium-severity vulnerability in Discourse, classified under Inefficient Regular Expression Complexity. CVSS score: 6.5/10. Published 2023-02-08.

How severe is CVE-2023-25167?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Discourse

CVE-2023-25167

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.

Vulnerability class: ReDoS (Regular Expression Denial of Service)

Published 2023-02-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (44.9th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Discourse — versions >= 3.1.0.beta, < 3.1.0.beta2, 3.1.0, < 3.0.1

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

References

github.com/discourse/discourse/security/advisories/GHSA-4w55-w26q-r35w (Vendor Advisory)
github.com/discourse/discourse/commit/ec4c30270887366dc28788bc4ab8a22a098573cd (Patch)

Frequently asked questions

What is CVE-2023-25167?: CVE-2023-25167 is a medium-severity vulnerability in Discourse, classified under Inefficient Regular Expression Complexity. CVSS score: 6.5/10. Published 2023-02-08.
How severe is CVE-2023-25167?: Medium severity. CVSS v3 base score is 6.5 out of 10.