{"answers":{"affected":"3 open source packages ship an affected version, including github.com/free5gc/udr. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40248 exists.","fix":"No fix published yet.","what":"CVE-2026-40248 is a high-severity missing authorization vulnerability in Free5gc Free5gc, published on 16 Apr 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-2026-40248 and fix it if it is affected.\n\nWhat it is: CVE-2026-40248 is a high-severity missing authorization vulnerability in Free5gc Free5gc, published on 16 Apr 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-2026-40248 exists.\n\nAffected packages and fixed versions:\n- github.com/free5gc/udr (Go): affected all versions; no fix listed\n- github.com/free5gc/udr (Go): affected all versions up to 1.4.2; no fix listed\n- github.com/free5gc/udr (Go): affected all versions up to 1.4.2; 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-2026-40248/ (Markdown: https://insights.sbomify.com/CVE-2026-40248/index.md)","id":"CVE-2026-40248","markdown":"https://insights.sbomify.com/CVE-2026-40248/index.md","name":"CVE-2026-40248","record":{"aliases":["GHSA-jgq2-qv8v-5cmj","GO-2026-5470"],"analysis":{"component_type":"server_software","fix_type":"no_fix_stated","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"5G core network","requires_auth":"none","summary":"Unauthenticated attackers can create or modify Traffic Influence Subscriptions in free5GC UDR due to improper path validation, allowing injection of malicious notification URIs and SUPIs.","user_interaction":"not_required","vuln_class":"missing_authorization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"free5gc","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:H/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-636","name":"Not Failing Securely"},{"id":"CWE-285","name":"Improper Authorization"}],"description":"free5GC is an open-source implementation of the 5G core network. In versions 4.2.1 and below of the UDR service, the handler for creating or updating Traffic Influence Subscriptions checks whether the influenceId path segment equals subs-to-notify, but does not return after sending the HTTP 404 response when validation fails. Execution continues and the subscription is created or overwritten regardless. An unauthenticated attacker with access to the 5G Service Based Interface can create or overwrite arbitrary Traffic Influence Subscriptions, including injecting attacker-controlled notificationUri values and arbitrary SUPIs, by supplying any value for the influenceId path segment. A patched version was not available at the time of publication.","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 UDR improper path validation allows unauthenticated creation and modification of Traffic Influence Subscriptions","id":"CVE-2026-40248","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"free5gc:free5gc","products":["free5gc:free5gc"],"type":"missing_authorization","year":"2026"},"n_packages":3,"n_references":1,"next":{"headline":"free5gc UDR fail-open request handling in PolicyDataSubsToNotifySubsIdPut may allow unintended subscription updates after input errors","id":"CVE-2026-40249"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/free5gc/udr","purl":"pkg:golang/github.com/free5gc/udr","source":"GO-2026-5470"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.4.2"],"package":"github.com/free5gc/udr","purl":null,"source":"GHSA-jgq2-qv8v-5cmj"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.4.2"],"package":"github.com/free5gc/udr","purl":"pkg:golang/github.com/free5gc/udr","source":"GHSA-jgq2-qv8v-5cmj"}],"prev":{"headline":"free5gc UDR improper path validation allows unauthenticated access to Traffic Influence Subscriptions","id":"CVE-2026-40247"},"products":["free5gc"],"published":"2026-04-16","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":"2026-04-20","vendors":["free5gc"]},"summary":"Unauthenticated attackers can create or modify Traffic Influence Subscriptions in free5GC UDR due to improper path validation, allowing injection of malicious notification URIs and SUPIs.","url":"https://insights.sbomify.com/CVE-2026-40248/"}