Vulnerability · Published Jun 26, 2026 · Assigned by GitHub_M
CVE-2026-55677Echo: Encoded slash (%2F) bypasses route-level protection and exposes static files
High 7.5
In plain English
A high-severity path traversal in echo from labstack. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | osbuild-composer | 165.1-5.el10_2.alma.1 | ALSA-2026:66432 |
| AlmaLinux:8 | osbuild-composer | 101.5-3.el8_10.alma.1 | ALSA-2026:67148 |
| AlmaLinux:9 | osbuild-composer | 165.1-5.el9_8.alma.1 | ALSA-2026:69293 |
| AlmaLinux:10 | osbuild-composer-core | 165.1-5.el10_2.alma.1 | ALSA-2026:66432 |
| AlmaLinux:8 | osbuild-composer-core | 101.5-3.el8_10.alma.1 | ALSA-2026:67148 |
| AlmaLinux:9 | osbuild-composer-core | 165.1-5.el9_8.alma.1 | ALSA-2026:69293 |
| AlmaLinux:10 | osbuild-composer-worker | 165.1-5.el10_2.alma.1 | ALSA-2026:66432 |
| AlmaLinux:8 | osbuild-composer-worker | 101.5-3.el8_10.alma.1 | ALSA-2026:67148 |
| AlmaLinux:9 | osbuild-composer-worker | 165.1-5.el9_8.alma.1 | ALSA-2026:69293 |
| Debian:12 | golang-github-labstack-echo | no fix listed | DEBIAN-CVE-2026-55677 |
| Debian:13 | golang-github-labstack-echo | no fix listed | DEBIAN-CVE-2026-55677 |
| Debian:14 | golang-github-labstack-echo | no fix listed | DEBIAN-CVE-2026-55677 |
| Go | github.com/labstack/echo | no fix listed | GHSA-vfp3-v2gw-7wfq |
| Go | github.com/labstack/echo/v4 | 4.15.3 | GO-2026-6293 |
| Go | github.com/labstack/echo/v4 | 4.15.3 | GHSA-vfp3-v2gw-7wfq |
| Go | github.com/labstack/echo/v5 | 5.2.0 | GHSA-vfp3-v2gw-7wfq |
| Go | github.com/labstack/echo/v5 | 5.2.0 | GO-2026-6293 |
| Rocky Linux:10 | osbuild-composer | 0:165.1-5.el10_2.rocky.0.1 | RLSA-2026:66432 |
| Rocky Linux:8 | osbuild-composer | 0:101.5-3.el8_10.rocky.0.6 | RLSA-2026:67148 |
| Rocky Linux:9 | osbuild-composer | 0:165.1-5.el9_8.rocky.0.1 | RLSA-2026:69293 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-55677 |
| Ubuntu:24.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-55677 |
| Ubuntu:25.10 | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-55677 |
| Ubuntu:26.04:LTS | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-55677 |
| Ubuntu:26.10 | golang-github-labstack-echo | no fix listed | UBUNTU-CVE-2026-55677 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo.v2 | no fix listed | UBUNTU-CVE-2026-55677 |
| Ubuntu:22.04:LTS | golang-github-labstack-echo.v3 | no fix listed | UBUNTU-CVE-2026-55677 |
Affected products (as reported)
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/labstack/echo/security/advisories/GHSA-vfp3-v2gw-7wfq x_refsource_CONFIRM