Path Traversal in Labstack Echo
CVE-2026-55677
Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, Echo's router and static file handler disagree on URL path decoding. The router matches routes using the raw encoded path (preserving %2F as-is), while StaticDirectoryHandler unescapes %2F to / before resolving filesystem paths. This allows an attacker to bypass route-level access controls and read static files without authorization. This vulnerability is fixed in 4.15.3 and 5.2.0.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (35.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 35.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Labstack Echo — versions < 4.15.3, >= 5.0.0, < 5.2.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-55677?
- CVE-2026-55677 is a high-severity vulnerability in Labstack Echo, classified under Path Traversal. CVSS score: 7.5/10. Published 2026-06-26.
- How severe is CVE-2026-55677?
- High severity. CVSS v3 base score is 7.5 out of 10.