{"answers":{"affected":"3 open source packages ship an affected version, including github.com/free5gc/udm. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42459 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2026-42459 is a high-severity vulnerability in Free5gc Free5gc, published on 27 May 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-2026-42459 and fix it if it is affected.\n\nWhat it is: CVE-2026-42459 is a high-severity vulnerability in Free5gc Free5gc, published on 27 May 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-2026-42459 exists.\n\nAffected packages and fixed versions:\n- github.com/free5gc/udm (Go): affected all versions; no fix listed\n- github.com/free5gc/udm (Go): affected all versions up to 1.4.3; no fix listed\n- github.com/free5gc/udm (Go): affected all versions up to 1.4.3; 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-2026-42459/ (Markdown: https://insights.sbomify.com/CVE-2026-42459/index.md)","id":"CVE-2026-42459","markdown":"https://insights.sbomify.com/CVE-2026-42459/index.md","name":"CVE-2026-42459","record":{"aliases":["GHSA-585v-hcgf-jhfr","GO-2026-5138"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"5G core network","requires_auth":"none","summary":"An unauthenticated attacker can inject control characters into the SUPI parameter to trigger errors that expose internal infrastructure details in free5GC UDM.","user_interaction":"not_required","vuln_class":"information_disclosure"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"free5gc","vendor":"free5gc"}],"cvss":{"score":7.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P","version":"4.0"},"cwes":[{"id":"CWE-209","name":"Generation of Error Message Containing Sensitive Information"},{"id":"CWE-20","name":"Improper Input Validation"}],"description":"free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the free5GC UDM component fails to validate the supi path parameter in six GET handlers of the nudm-sdm (Subscriber Data Management) service. An unauthenticated attacker can inject control characters into the SUPI parameter, causing UDM to forward a malformed request to UDR and return a 500 Internal Server Error response that exposes internal infrastructure details. This vulnerability is fixed in 4.2.2.","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":"Free5GC UDM has Improper Input Validation and Generation of Error Messages Containing Sensitive Information","id":"CVE-2026-42459","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"free5gc:free5gc","products":["free5gc:free5gc"],"type":"information_disclosure","year":"2026"},"n_packages":3,"n_references":1,"next":{"headline":"Arcane Vulnerable to Unauthenticated Disclosure of Custom Compose Template Content (incl. `.env` secrets)","id":"CVE-2026-42461"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/free5gc/udm","purl":"pkg:golang/github.com/free5gc/udm","source":"GO-2026-5138"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.4.3"],"package":"github.com/free5gc/udm","purl":null,"source":"GHSA-585v-hcgf-jhfr"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.4.3"],"package":"github.com/free5gc/udm","purl":"pkg:golang/github.com/free5gc/udm","source":"GHSA-585v-hcgf-jhfr"}],"prev":{"headline":"Magento LTS: Reflected XSS - Import -\u003e Data Flow (profiles)","id":"CVE-2026-42458"},"products":["free5gc"],"published":"2026-05-27","related":[{"cvss_score":10,"headline":"free5GC: NEF nnef-oam route group is unauthenticated; no-token requests reach the OAM handler","id":"CVE-2026-44327","kev_date_added":null,"published":"2026-05-27"},{"cvss_score":10,"headline":"free5GC's SMF UPI management interface lacks auth middleware; unauthenticated topology read/write requests reach handlers","id":"CVE-2026-44329","kev_date_added":null,"published":"2026-05-27"},{"cvss_score":10,"headline":"free5GC's NEF nnef-pfdmanagement API is unauthenticated; forged bearer tokens can read PFD data and create/delete PFD subscriptions","id":"CVE-2026-44330","kev_date_added":null,"published":"2026-05-27"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2025-63679","kev_date_added":null,"published":"2025-11-12"},{"cvss_score":9.4,"headline":"free5GC's NEF 3gpp-pfd-management API is unauthenticated; forged bearer tokens can create, read, and delete PFD transactions","id":"CVE-2026-44315","kev_date_added":null,"published":"2026-05-27"},{"cvss_score":9.4,"headline":"free5GC's NEF 3gpp-traffic-influence API is unauthenticated; missing or forged bearer tokens can create, read, patch, and delete subscriptions","id":"CVE-2026-44326","kev_date_added":null,"published":"2026-05-27"},{"cvss_score":8.7,"headline":"free5gc UDR improper path validation allows unauthenticated access to Traffic Influence Subscriptions","id":"CVE-2026-40247","kev_date_added":null,"published":"2026-04-16"}],"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":"2026-05-28","vendors":["free5gc"]},"summary":"An unauthenticated attacker can inject control characters into the SUPI parameter to trigger errors that expose internal infrastructure details in free5GC UDM.","url":"https://insights.sbomify.com/CVE-2026-42459/"}