{"answers":{"affected":"3 open source packages ship an affected version, including github.com/phires/go-guerrilla.","exploited":"There is no known exploitation of CVE-2025-31135 in the wild and no public exploit code.","fix":"Upgrade github.com/phires/go-guerrilla to 1.6.7 or later.","what":"CVE-2025-31135 is a medium-severity vulnerability in phires go-guerrilla, published on 1 Apr 2025. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2025-31135 and fix it if it is affected.\n\nWhat it is: CVE-2025-31135 is a medium-severity vulnerability in phires go-guerrilla, published on 1 Apr 2025. 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-2025-31135 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/phires/go-guerrilla (Go): affected all versions; fixed in 1.6.7\n- github.com/phires/go-guerrilla (Go): affected all versions; fixed in 1.6.7\n- github.com/phires/go-guerrilla (Go): affected all versions; fixed in 1.6.7\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-2025-31135/ (Markdown: https://insights.sbomify.com/CVE-2025-31135/index.md)","id":"CVE-2025-31135","markdown":"https://insights.sbomify.com/CVE-2025-31135/index.md","name":"CVE-2025-31135","record":{"aliases":["GHSA-c2c3-pqw5-5p7c","GO-2025-3588"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Go SMTP server","requires_auth":"none","summary":"Attackers can spoof IP addresses by sending multiple PROXY commands when ProxyOn is enabled, bypassing IP-based security controls.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-20","name":"Improper Input Validation"}],"description":"Go-Guerrilla SMTP Daemon is a lightweight SMTP server written in Go. Prior to 1.6.7, when ProxyOn is enabled, the PROXY command will be accepted multiple times, with later invocations overriding earlier ones. The proxy protocol only supports one initial PROXY header; anything after that is considered part of the exchange between client and server, so the client is free to send further PROXY commands with whatever data it pleases. go-guerrilla will treat these as coming from the reverse proxy, allowing a client to spoof its IP address. This vulnerability is fixed in 1.6.7.","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":"Go-Guerrilla SMTP Daemon allows the PROXY command to be sent multiple times","id":"CVE-2025-31135","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"security_feature_bypass","year":"2025"},"n_packages":3,"n_references":2,"next":{"headline":"FreshRSS vulnerable to Cross-site Scripting by \u003ciframe\u003e'ing a vulnerable same-origin page in a feed entry","id":"CVE-2025-31136"},"packages":[{"ecosystem":"Go","fixed":["1.6.7"],"introduced":["0"],"last_affected":[],"package":"github.com/phires/go-guerrilla","purl":null,"source":"GHSA-c2c3-pqw5-5p7c"},{"ecosystem":"Go","fixed":["1.6.7"],"introduced":["0"],"last_affected":[],"package":"github.com/phires/go-guerrilla","purl":"pkg:golang/github.com/phires/go-guerrilla","source":"GHSA-c2c3-pqw5-5p7c"},{"ecosystem":"Go","fixed":["1.6.7"],"introduced":["0"],"last_affected":[],"package":"github.com/phires/go-guerrilla","purl":"pkg:golang/github.com/phires/go-guerrilla","source":"GO-2025-3588"}],"prev":{"headline":"FreshRSS vulnerable to directory enumeration via ext.php","id":"CVE-2025-31134"},"products":["go-guerrilla"],"published":"2025-04-01","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":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"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":"2026-01-28","vendors":["phires"]},"summary":"Attackers can spoof IP addresses by sending multiple PROXY commands when ProxyOn is enabled, bypassing IP-based security controls.","url":"https://insights.sbomify.com/CVE-2025-31135/"}