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Vulnerability record · CVE-2026-55677 · published 26 June 2026

CVE-2026-55677: Path traversal vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.43% · top 65.2% CWE-22 · Path traversal Deferred
7.5CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
26 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

LinkTags
https://github.com/labstack/echo/security/advisories/GHSA-vfp3-v2gw-7wfq
https://github.com/labstack/echo/security/advisories/GHSA-vfp3-v2gw-7wfq

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Source: NIST National Vulnerability Database (record CVE-2026-55677), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.