{"answers":{"affected":"4 open source packages ship an affected version, including github.com/labstack/echo/v4 and github.com/labstack/echo/v5.","exploited":"There is no known exploitation of CVE-2026-118656 in the wild and no public exploit code.","fix":"Upgrade github.com/labstack/echo/v4 to 4.16.0 or later.","what":"CVE-2026-118656 is a medium-severity vulnerability in labstack echo, published on 28 Oct 2026."},"fix_prompt":"Check this codebase for CVE-2026-118656 and fix it if it is affected.\n\nWhat it is: CVE-2026-118656 is a medium-severity vulnerability in labstack echo, published on 28 Oct 2026. \nExploitation: There is no known exploitation of CVE-2026-118656 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/labstack/echo/v4 (Go): affected all versions; fixed in 4.16.0\n- github.com/labstack/echo/v4 (Go): affected all versions; fixed in 4.16.0\n- github.com/labstack/echo/v5 (Go): affected all versions; fixed in 5.4.0\n- github.com/labstack/echo/v5 (Go): affected all versions; fixed in 5.4.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-118656/ (Markdown: https://insights.sbomify.com/CVE-2026-118656/index.md)","id":"CVE-2026-118656","markdown":"https://insights.sbomify.com/CVE-2026-118656/index.md","name":"CVE-2026-118656","record":{"aliases":["DEBIAN-CVE-2026-118656","ECHO-e06f-d2f8-f714","GHSA-v753-g4cw-jm48","UBUNTU-CVE-2026-118656"],"analysis":null,"analysis_generated_by":null,"assigner":"GitHub_M","cpe":[],"cvss":{"score":6.1,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-601","name":"URL Redirection to Untrusted Site"}],"description":"Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, sanitizeURI checks only the first two bytes of a redirect target before deciding whether it begins with an absolute-path separator pair. When AddTrailingSlash or RemoveTrailingSlash is configured with a redirect status, a slash, TAB, separator path form can evade the guard, be emitted in the Location header, and be normalized by a browser into an attacker-controlled host. This issue is fixed in 4.16.0 and 5.4.0.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Echo: Open Redirect via Control-Character Prefix Defeating sanitizeURI","id":"CVE-2026-118656","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":null,"year":"2026"},"n_packages":4,"n_references":5,"next":{"headline":"Echo: HTTPS Redirect and HSTS Bypass via Unconditional Trust of Forwarded Scheme Headers","id":"CVE-2026-118657"},"packages":[{"ecosystem":"Go","fixed":["4.16.0"],"introduced":["0"],"last_affected":[],"package":"github.com/labstack/echo/v4","purl":null,"source":"GHSA-v753-g4cw-jm48"},{"ecosystem":"Go","fixed":["4.16.0"],"introduced":["0"],"last_affected":[],"package":"github.com/labstack/echo/v4","purl":"pkg:golang/github.com/labstack/echo/v4","source":"GHSA-v753-g4cw-jm48"},{"ecosystem":"Go","fixed":["5.4.0"],"introduced":["0"],"last_affected":[],"package":"github.com/labstack/echo/v5","purl":null,"source":"GHSA-v753-g4cw-jm48"},{"ecosystem":"Go","fixed":["5.4.0"],"introduced":["0"],"last_affected":[],"package":"github.com/labstack/echo/v5","purl":"pkg:golang/github.com/labstack/echo/v5","source":"GHSA-v753-g4cw-jm48"}],"prev":{"headline":"Echo: Static Middleware Double-Unescape Path Traversal","id":"CVE-2026-118655"},"products":["echo"],"published":"2026-10-28","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-29","vendors":["labstack"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-118656/"}