{"id":"CVE-2026-55677","aliases":["GHSA-vfp3-v2gw-7wfq"],"url":"https://o3.security/vulnerability/CVE-2026-55677","summary":"Echo: Encoded slash (%2F) bypasses route-level protection and exposes static files","details":"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.","published":"2026-06-26T16:15:55.633Z","modified":"2026-08-12T03:51:28.312278122Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/labstack/echo/v5","fixedVersion":"5.2.0"},{"ecosystem":"Go","name":"github.com/labstack/echo/v4","fixedVersion":"4.15.3"},{"ecosystem":"Go","name":"github.com/labstack/echo","fixedVersion":null}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55677.json"},{"type":"ADVISORY","url":"https://github.com/labstack/echo/security/advisories/GHSA-vfp3-v2gw-7wfq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55677"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:28.312278122Z"}}