{"answers":{"affected":"5 open source packages ship an affected version, including github.com/gofiber/fiber/v2 and github.com/gofiber/fiber. It affects 1 product.","exploited":"There is no known exploitation of CVE-2023-41338 in the wild and no public exploit code.","fix":"Upgrade github.com/gofiber/fiber/v2 to a fixed version for your release line: 2.49.2 or 2.49.2-0.20230906112033-b8c9ede6efa2.","what":"CVE-2023-41338 is a medium-severity authentication bypass vulnerability in gofiber fiber, published on 8 Sep 2023. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2023-41338 and fix it if it is affected.\n\nWhat it is: CVE-2023-41338 is a medium-severity authentication bypass vulnerability in gofiber fiber, published on 8 Sep 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2023-41338 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/gofiber/fiber/v2 (Go): affected all versions; fixed in 2.49.2\n- github.com/gofiber/fiber/v2 (Go): affected all versions; fixed in 2.49.2\n- github.com/gofiber/fiber/v2 (Go): affected all versions; fixed in 2.49.2-0.20230906112033-b8c9ede6efa2\n- github.com/gofiber/fiber (Go): affected all versions up to 1.14.6; no fix listed\n- github.com/gofiber/fiber (Go): affected all versions up to 1.14.6; no fix listed\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-2023-41338/ (Markdown: https://insights.sbomify.com/CVE-2023-41338/index.md)","id":"CVE-2023-41338","markdown":"https://insights.sbomify.com/CVE-2023-41338/index.md","name":"CVE-2023-41338","record":{"aliases":["GHSA-3q5p-3558-364f","GO-2023-2052"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Go web framework","requires_auth":"none","summary":"Attackers can bypass localhost restrictions in gofiber by spoofing the X-Forwarded-For header, gaining unauthorized access to protected resources.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"fiber","vendor":"gofiber"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-670","name":"Always-Incorrect Control Flow Implementation"}],"description":"Fiber is an Express inspired web framework built in the go language. Versions of gofiber prior to 2.49.2 did not properly restrict access to localhost. This issue impacts users of our project who rely on the `ctx.IsFromLocal` method to restrict access to localhost requests. If exploited, it could allow unauthorized access to resources intended only for localhost. Setting `X-Forwarded-For: 127.0.0.1` in a request from a foreign host, will result in true for `ctx.IsFromLocal`. Access is limited to the scope of the affected process. This issue has been patched in version `2.49.2` with commit `b8c9ede6`. Users are advised to upgrade. There are no known workarounds to remediate this vulnerability without upgrading to the patched version.","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":"Vulnerability in Ctx.IsFromLocal() in gofiber","id":"CVE-2023-41338","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"auth_bypass","year":"2023"},"n_packages":5,"n_references":4,"next":{"headline":"Unsecured WMS dynamic styling sld=\u003curl\u003e parameter affords blind unauthenticated SSRF in GeoServer","id":"CVE-2023-41339"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.14.6"],"package":"github.com/gofiber/fiber","purl":null,"source":"GHSA-3q5p-3558-364f"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.14.6"],"package":"github.com/gofiber/fiber","purl":"pkg:golang/github.com/gofiber/fiber","source":"GHSA-3q5p-3558-364f"},{"ecosystem":"Go","fixed":["2.49.2"],"introduced":["0"],"last_affected":[],"package":"github.com/gofiber/fiber/v2","purl":null,"source":"GHSA-3q5p-3558-364f"},{"ecosystem":"Go","fixed":["2.49.2"],"introduced":["0"],"last_affected":[],"package":"github.com/gofiber/fiber/v2","purl":"pkg:golang/github.com/gofiber/fiber/v2","source":"GHSA-3q5p-3558-364f"},{"ecosystem":"Go","fixed":["2.49.2-0.20230906112033-b8c9ede6efa2"],"introduced":["0"],"last_affected":[],"package":"github.com/gofiber/fiber/v2","purl":"pkg:golang/github.com/gofiber/fiber/v2","source":"GO-2023-2052"}],"prev":{"headline":"h2o vulnerable to TLS session resumption misdirection","id":"CVE-2023-41337"},"products":["fiber"],"published":"2023-09-08","related":[{"cvss_score":10,"headline":"Fiber Session Middleware Token Injection Vulnerability","id":"CVE-2024-38513","kev_date_added":null,"published":"2024-07-01"},{"cvss_score":10,"headline":"CSRF Token Reuse Vulnerability in fiber","id":"CVE-2023-45128","kev_date_added":null,"published":"2023-10-16"},{"cvss_score":9.4,"headline":"Fiber has Insecure CORS Configuration, Allowing Wildcard Origin with Credentials","id":"CVE-2024-25124","kev_date_added":null,"published":"2024-02-21"},{"cvss_score":9.2,"headline":"Fiber insecurely fallsback in utils.UUIDv4() / utils.UUID() — predictable / zero‑UUID on crypto/rand failure","id":"CVE-2025-66630","kev_date_added":null,"published":"2026-02-09"},{"cvss_score":8.7,"headline":"Fiber Susceptible to Crash via `BodyParser` Due to Unvalidated Large Slice Index in Decoder","id":"CVE-2025-54801","kev_date_added":null,"published":"2025-08-05"},{"cvss_score":8.6,"headline":"CSRF Token Validation Vulnerability in fiber","id":"CVE-2023-45141","kev_date_added":null,"published":"2023-10-16"},{"cvss_score":7.7,"headline":"Fiber has an Arbitrary File Read in Static Middleware on Windows","id":"CVE-2026-25891","kev_date_added":null,"published":"2026-02-24"}],"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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2024-09-26","vendors":["gofiber"]},"summary":"Attackers can bypass localhost restrictions in gofiber by spoofing the X-Forwarded-For header, gaining unauthorized access to protected resources.","url":"https://insights.sbomify.com/CVE-2023-41338/"}