{"answers":{"affected":"3 open source packages ship an affected version, including github.com/free5gc/amf.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-4531 exists.","fix":"Upgrade github.com/free5gc/amf to 1.4.3-0.20260306074636-52e9386401ce or later.","what":"CVE-2026-4531 is a medium-severity denial of service vulnerability in Free5GC, published on 22 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-2026-4531 and fix it if it is affected.\n\nWhat it is: CVE-2026-4531 is a medium-severity denial of service vulnerability in Free5GC, published on 22 Mar 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-2026-4531 exists.\n\nAffected packages and fixed versions:\n- github.com/free5gc/amf (Go): affected all versions; fixed in 1.4.3-0.20260306074636-52e9386401ce\n- github.com/free5gc/amf (Go): affected all versions; fixed in 1.4.3-0.20260306074636-52e9386401ce\n- github.com/free5gc/amf (Go): affected all versions; fixed in 1.4.3-0.20260306074636-52e9386401ce\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-2026-4531/ (Markdown: https://insights.sbomify.com/CVE-2026-4531/index.md)","id":"CVE-2026-4531","markdown":"https://insights.sbomify.com/CVE-2026-4531/index.md","name":"CVE-2026-4531","record":{"aliases":["GHSA-xq44-64rg-8g3h","GO-2026-5767"],"analysis":{"component_type":"server_software","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"5G Core Network","requires_auth":"none","summary":"Remote attackers can cause a denial of service in Free5GC AMF by exploiting a flaw in the HandleRegistrationComplete function.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulDB","cpe":[],"cvss":{"score":6.9,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X","version":"4.0"},"cwes":[{"id":"CWE-404","name":"Improper Resource Shutdown or Release"}],"description":"A weakness has been identified in Free5GC 4.1.0. Affected is the function HandleRegistrationComplete of the file internal/gmm/handler.go of the component AMF. Executing a manipulation can lead to denial of service. The attack may be performed from remote. This patch is called 52e9386401ce56ea773c5aa587d4cdf7d53da799. It is best practice to apply a patch to resolve this issue.","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 AMF handler.go HandleRegistrationComplete denial of service","id":"CVE-2026-4531","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":7,"next":{"headline":"code-projects Simple Food Ordering System Database Backup food.sql file access","id":"CVE-2026-4532"},"packages":[{"ecosystem":"Go","fixed":["1.4.3-0.20260306074636-52e9386401ce"],"introduced":["0"],"last_affected":[],"package":"github.com/free5gc/amf","purl":null,"source":"GHSA-xq44-64rg-8g3h"},{"ecosystem":"Go","fixed":["1.4.3-0.20260306074636-52e9386401ce"],"introduced":["0"],"last_affected":[],"package":"github.com/free5gc/amf","purl":"pkg:golang/github.com/free5gc/amf","source":"GHSA-xq44-64rg-8g3h"},{"ecosystem":"Go","fixed":["1.4.3-0.20260306074636-52e9386401ce"],"introduced":["0"],"last_affected":[],"package":"github.com/free5gc/amf","purl":"pkg:golang/github.com/free5gc/amf","source":"GO-2026-5767"}],"prev":{"headline":"apconw Aix-DB terminology_retriever.py sql injection","id":"CVE-2026-4530"},"products":["Free5GC"],"published":"2026-03-22","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":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-23","vendors":["n/a"]},"summary":"Remote attackers can cause a denial of service in Free5GC AMF by exploiting a flaw in the HandleRegistrationComplete function.","url":"https://insights.sbomify.com/CVE-2026-4531/"}