Vulnerability details

CVE-2026-55677

labstack echo

Echo: Encoded slash (%2F) bypasses route-level protection and exposes static files

CVSS 3.1

7.5High

Official 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 scores

Score	Version	Source	Vector
7.5High	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`

Affected products

Vendor	Product	Versions	Source
labstack	echo	< 4.15.3	CVEProject cvelistV5 (CNA)
labstack	echo	>= 5.0.0, < 5.2.0	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-06-26
Last updated: 2026-06-26
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.51%

Probability of exploitation in 30 days

44.4%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

CWE-22
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')