EUVD-2026-41420
GHSA-g4jq-25cx-3cw5
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-reachable skill import with low complexity but requires an authenticated account (PR:L); impact is a full event-loop stall so A:H, with no confidentiality or integrity effect.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
Denial of service in LobeChat before 2.2.10-canary.15 lets an authenticated user hang the entire Node.js server by importing a GitHub-hosted skill whose repository URL path contains a catastrophic-backtracking regex pattern. Because the malicious basePath is compiled into a dynamic regular expression in findSkillMd and matched synchronously against archive entries, a single request blocks the shared event loop for tens of seconds, denying service to all concurrent users. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated LobeChat account (CVSS PR:L) with access to the GitHub skill-import feature; the attacker supplies a malicious basePath in the GitHub repository URL path containing unescaped regex metacharacters (catastrophic-backtracking patterns) that reach the dynamically constructed regular expression in findSkillMd. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H) scores 7.1 and correctly isolates impact to availability only - no confidentiality or integrity loss. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated LobeChat user navigates to the skill-import feature and submits a crafted GitHub repository URL whose path contains a catastrophic-backtracking regex pattern as the basePath. When findSkillMd compiles and runs that pattern synchronously against archive entries, the Node.js event loop freezes for tens of seconds, making the application unresponsive for every other user; the attacker can repeat the request to sustain the outage. … |
| Remediation | Vendor-released patch: upgrade to LobeChat 2.2.10-canary.15 or later (https://github.com/lobehub/lobehub/releases/tag/v2.2.10-canary.15); the code fix is in commit 349bbe326eb8635d6d9c6a96d12702681ae3a84a and PR https://github.com/lobehub/lobehub/pull/16548, which properly escapes the user-supplied basePath before regex construction. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all LobeChat deployments and current versions; disable or restrict GitHub-based skill imports pending patch deployment. …
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External POC / Exploit Code
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