Mockoon provides way to design and run mock APIs. Prior to 9.7.0, a FILE response whose filePath embeds request data is confined by getSafeFilePath in packages/commons-server/src/libs/server/server.ts with resolvedPath.startsWith(staticBaseDir). That prefix test has no path-separator boundary, so a ../-escaped path whose absolute form string-prefixes the base directory passes, allowing an unauthenticated client to read files from sibling paths outside the served directory through HTTP sendFile, WebSocket, or callbacks. This issue is fixed in version 9.7.0.
CVE-2026-59149
MEDIUMPre-NVD 6.56.5—Elevated
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 75% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.5
- EG Score
- 6.5(medium)
- EPSS
- 25.0%
- KEV
- Not listed
Published
July 9, 2026
Last Modified
July 10, 2026
Advisory Details (5)
Auto-updated Jul 9, 2026🔬 Proof of concept available. Patch available. Sources: github_commit, github_pr, github_release, github.
github Patch Available🟡 PoC Available
Path traversal in templated `filePath` lets a request escape the served directory (prefix-only base check) · Advisory · mockoon/mockoon · GitHub
https://github.com/mockoon/mockoon/security/advisories/GHSA-8wqc-v2q8-vff2github_release Patch Available
Release v9.7.0 (mockoon/mockoon)
Patch available: mockoon/mockoon v9.7.0
https://github.com/mockoon/mockoon/releases/tag/v9.7.0github_pr Patch Available
Fix path traversal in file path
Patch available: mockoon/mockoon v9.7.0 (PR #2255 merged 2026-06-18)
https://github.com/mockoon/mockoon/pull/2255github_commit Patch Available
commit b42bdfb7f82e (mockoon/mockoon)
Patch available: mockoon/mockoon v9.7.0 (contains commit b42bdfb7f82e)
https://github.com/mockoon/mockoon/commit/b42bdfb7f82e83f0e81bea8e6fe41adf5ec82585Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Frequently asked(5)
What is CVE-2026-59149?
CVE-2026-59149 is a medium vulnerability published on July 9, 2026. Mockoon provides way to design and run mock APIs. Prior to 9.7.0, a FILE response whose filePath embeds request data is confined by getSafeFilePath in packages/commons-server/src/libs/server/server.ts with resolvedPath.startsWith(staticBaseDir). That prefix test has no path-separator boundary, so a…
When was CVE-2026-59149 disclosed?
CVE-2026-59149 was first published in the National Vulnerability Database on July 9, 2026, with the most recent update on July 10, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59149 actively exploited?
CVE-2026-59149 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 25.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-59149?
CVE-2026-59149 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-59149?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59149, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-59149
Is Your Infrastructure Affected by CVE-2026-59149?
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