Vulnerability in Lobehub
CVE-2026-58578
LobeChat before version 2.2.10-canary.15 contains a regular expression denial of service (ReDoS) vulnerability that allows authenticated attackers to block the Node.js event loop by supplying a catastrophic-backtracking pattern in a GitHub repository URL path during skill import. Attackers can craft a malicious basePath value containing unescaped regex metacharacters such as catastrophic-backtracking patterns, which are injected into a dynamically constructed regular expression in the findSkillMd function and executed synchronously against archive entries, denying service to all concurrent users for tens of seconds per request.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
Published · last modified .
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: 0.005 (44.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Lobehub — versions 0
Weakness classification (CWE)
References
- github.com/lobehub/lobehub/commit/349bbe326eb8635d6d9c6a96d12702681ae3a84a (patch)
- github.com/lobehub/lobehub/issues/16494 (technical-description, exploit)
- github.com/lobehub/lobehub/pull/16548 (issue-tracking)
- github.com/lobehub/lobehub/releases/tag/v2.2.10-canary.15 (release-notes)
- www.vulncheck.com/advisories/lobechat-canary-15-regular-expression-denial-of-se… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-58578?
- CVE-2026-58578 is a medium-severity vulnerability in Lobehub, classified under Inefficient Regular Expression Complexity. CVSS score: 6.5/10. Published 2026-07-02.
- How severe is CVE-2026-58578?
- Medium severity. CVSS v3 base score is 6.5 out of 10.