{"answers":{"affected":"5 open source packages ship an affected version, including github.com/caddyserver/caddy/v2 and github.com/caddyserver/caddy. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52844 exists.","fix":"Upgrade github.com/caddyserver/caddy/v2 to 2.11.4 or later.","what":"CVE-2026-52844 is a high-severity path traversal vulnerability in caddyserver caddy, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-52844 and fix it if it is affected.\n\nWhat it is: CVE-2026-52844 is a high-severity path traversal vulnerability in caddyserver caddy, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52844 exists.\n\nAffected packages and fixed versions:\n- github.com/caddyserver/caddy/v2 (Go): affected all versions; fixed in 2.11.4\n- github.com/caddyserver/caddy/v2 (Go): affected all versions; fixed in 2.11.4\n- github.com/caddyserver/caddy/v2 (Go): affected all versions; fixed in 2.11.4\n- github.com/caddyserver/caddy (Go): affected all versions up to 1.0.5; no fix listed\n- github.com/caddyserver/caddy (Go): affected all versions up to 1.0.5; 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-2026-52844/ (Markdown: https://insights.sbomify.com/CVE-2026-52844/index.md)","id":"CVE-2026-52844","markdown":"https://insights.sbomify.com/CVE-2026-52844/index.md","name":"CVE-2026-52844","record":{"aliases":["CLEANSTART-2026-QE63753","GHSA-qrp7-cvwr-j2c6","GO-2026-5595","MINI-whvf-68r5-h8f5","MINI-wr6f-fcr7-4j65","UBUNTU-CVE-2026-52844"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["security_bypass","data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Caddy web server","requires_auth":"none","summary":"An attacker can bypass path-based authorization on Windows to access protected files by using encoded backslashes in the request path.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"caddy","vendor":"caddyserver"}],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"cwes":[{"id":"CWE-284","name":"Improper Access Control"},{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, on Windows, Caddy path matchers treat /private\\secret.txt as outside /private/*, but file_server later resolves the same request path as private\\secret.txt on disk. An unauthenticated remote client can bypass Caddy path-scoped auth/deny routes protecting /private/*. This vulnerability is fixed in 2.11.4.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Caddy: Windows `file_server` path authorization bypass via encoded backslash","id":"CVE-2026-52844","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"path_traversal","year":"2026"},"n_packages":5,"n_references":1,"next":{"headline":"Caddy: FastCGI header normalization bypass in `forward_auth copy_headers`","id":"CVE-2026-52845"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.0.5"],"package":"github.com/caddyserver/caddy","purl":null,"source":"GHSA-qrp7-cvwr-j2c6"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.0.5"],"package":"github.com/caddyserver/caddy","purl":"pkg:golang/github.com/caddyserver/caddy","source":"GHSA-qrp7-cvwr-j2c6"},{"ecosystem":"Go","fixed":["2.11.4"],"introduced":["0"],"last_affected":[],"package":"github.com/caddyserver/caddy/v2","purl":null,"source":"GHSA-qrp7-cvwr-j2c6"},{"ecosystem":"Go","fixed":["2.11.4"],"introduced":["0"],"last_affected":[],"package":"github.com/caddyserver/caddy/v2","purl":"pkg:golang/github.com/caddyserver/caddy/v2","source":"GHSA-qrp7-cvwr-j2c6"},{"ecosystem":"Go","fixed":["2.11.4"],"introduced":["0"],"last_affected":[],"package":"github.com/caddyserver/caddy/v2","purl":"pkg:golang/github.com/caddyserver/caddy/v2","source":"GO-2026-5595"}],"prev":{"headline":"Lightpanda: fetch() and XMLHttpRequest attach session cookies to cross-origin requests regardless of credentials mode","id":"CVE-2026-52843"},"products":["caddy"],"published":"2026-06-23","related":[{"cvss_score":9.8,"headline":"Caddy vulnerable to Authentication Bypass due to mishandling of TLS client authentication","id":"CVE-2018-21246","kev_date_added":null,"published":"2020-06-15"},{"cvss_score":8.9,"headline":"Caddy: Unicode case-folding length expansion causes incorrect split_path index in FastCGI transport","id":"CVE-2026-27590","kev_date_added":null,"published":"2026-02-24"},{"cvss_score":8.8,"headline":"Caddy's mTLS client authentication silently fails open when CA certificate file is missing or malformed","id":"CVE-2026-27586","kev_date_added":null,"published":"2026-02-24"},{"cvss_score":8.1,"headline":"Caddy: Unsafe Unicode Handling in FastCGI splitPos Allows Execution of Non-PHP Files","id":"CVE-2026-45135","kev_date_added":null,"published":"2026-06-23"},{"cvss_score":8.1,"headline":"Caddy: FastCGI header normalization bypass in `forward_auth copy_headers`","id":"CVE-2026-52845","kev_date_added":null,"published":"2026-06-23"},{"cvss_score":8.1,"headline":"Caddy forward_auth copy_headers Does Not Strip Client-Supplied Headers, Allowing Identity Injection and Privilege Escalation","id":"CVE-2026-30851","kev_date_added":null,"published":"2026-03-07"},{"cvss_score":7.7,"headline":"Caddy: MatchPath %xx (escaped-path) branch skips case normalization, enabling path-based route/auth bypass","id":"CVE-2026-27587","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":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-06-23","vendors":["caddyserver"]},"summary":"An attacker can bypass path-based authorization on Windows to access protected files by using encoded backslashes in the request path.","url":"https://insights.sbomify.com/CVE-2026-52844/"}