{"answers":{"affected":"3 open source packages ship an affected version, including github.com/free5gc/udm. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-33191 in the wild and no public exploit code.","fix":"Upgrade github.com/free5gc/udm to 1.4.2 or later.","what":"CVE-2026-33191 is a high-severity denial of service vulnerability in free5gc, published on 20 Mar 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-2026-33191 and fix it if it is affected.\n\nWhat it is: CVE-2026-33191 is a high-severity denial of service vulnerability in free5gc, published on 20 Mar 2026. 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-2026-33191 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/free5gc/udm (Go): affected all versions; fixed in 1.4.2\n- github.com/free5gc/udm (Go): affected all versions; fixed in 1.4.2\n- github.com/free5gc/udm (Go): affected all versions; fixed in 1.4.2\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-2026-33191/ (Markdown: https://insights.sbomify.com/CVE-2026-33191/index.md)","id":"CVE-2026-33191","markdown":"https://insights.sbomify.com/CVE-2026-33191/index.md","name":"CVE-2026-33191","record":{"aliases":["GHSA-p9hg-pq3q-v9gv","GO-2026-4763","ROOT-OS-UBUNTU-2204-CVE-2026-33191"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"5G core network software","requires_auth":"none","summary":"Remote attackers can cause denial of service in free5GC UDM by injecting null bytes into URL path parameters, triggering internal server errors.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"udm","vendor":"free5gc"}],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-248","name":"Uncaught Exception"},{"id":"CWE-158","name":"Improper Neutralization of Null Byte or NUL Character"}],"description":"Free5GC is an open-source Linux Foundation project for 5th generation (5G) mobile core networks. Versions prior to 1.4.2\nare vulnerable to null byte injection in URL path parameters. A remote attacker can inject null bytes (URL-encoded as %00) into the supi path parameter of the UDM's Nudm_SubscriberDataManagement API. This causes URL parsing failure in Go's net/url package with the error \"invalid control character in URL\", resulting in a 500 Internal Server Error. This null byte injection vulnerability can be exploited for denial of service attacks. When the supi parameter contains null characters, the UDM attempts to construct a URL for UDR that includes these control characters. Go's URL parser rejects them, causing the request to fail with 500 instead of properly validating input and returning 400 Bad Request. This issue has been fixed in version 1.4.2.","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":"free5GC UDM vulnerable to null byte injection in URL path parameters causing 500 Internal Server Error","id":"CVE-2026-33191","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"free5GC UDM incorrectly returns 500 for empty supi path parameter in PATCH sdm-subscriptions reques","id":"CVE-2026-33192"},"packages":[{"ecosystem":"Go","fixed":["1.4.2"],"introduced":["0"],"last_affected":[],"package":"github.com/free5gc/udm","purl":null,"source":"GHSA-p9hg-pq3q-v9gv"},{"ecosystem":"Go","fixed":["1.4.2"],"introduced":["0"],"last_affected":[],"package":"github.com/free5gc/udm","purl":"pkg:golang/github.com/free5gc/udm","source":"GHSA-p9hg-pq3q-v9gv"},{"ecosystem":"Go","fixed":["1.4.2"],"introduced":["0"],"last_affected":[],"package":"github.com/free5gc/udm","purl":"pkg:golang/github.com/free5gc/udm","source":"GO-2026-4763"}],"prev":{"headline":"CoreDNS TSIG authentication bypass on encrypted DNS transports","id":"CVE-2026-33190"},"products":["free5gc"],"published":"2026-03-20","related":[{"cvss_score":8.7,"headline":"free5GC UDM DataChangeNotification Procedure Panic Due to Nil Pointer Dereference","id":"CVE-2026-33064","kev_date_added":null,"published":"2026-03-20"},{"cvss_score":8.7,"headline":"free5GC UDM incorrectly returns 500 for empty supi path parameter in PATCH sdm-subscriptions reques","id":"CVE-2026-33192","kev_date_added":null,"published":"2026-03-20"},{"cvss_score":7.5,"headline":"free5GC udm vulnerable to Invalid Curve Attack","id":"CVE-2023-46324","kev_date_added":null,"published":"2023-10-23"},{"cvss_score":6.9,"headline":"free5GC UDM incorrectly returns 500 for empty supi path parameter in DELETE sdm-subscriptions request","id":"CVE-2026-33065","kev_date_added":null,"published":"2026-03-20"},{"cvss_score":6.6,"headline":"free5GC has Improper Input Validation in UDM UEAU Service","id":"CVE-2026-27642","kev_date_added":null,"published":"2026-02-24"},{"cvss_score":6.6,"headline":"free5GC has Improper Error Handling in UDM, Leading to Information Exposure","id":"CVE-2025-69250","kev_date_added":null,"published":"2026-02-23"}],"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":"2026-03-20","vendors":["free5gc"]},"summary":"Remote attackers can cause denial of service in free5GC UDM by injecting null bytes into URL path parameters, triggering internal server errors.","url":"https://insights.sbomify.com/CVE-2026-33191/"}