{"answers":{"affected":"3 open source packages ship an affected version, including github.com/free5gc/amf. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42081 exists.","fix":"Upgrade to a fixed version.","what":"CVE-2026-42081 is a medium-severity vulnerability in Free5gc Free5gc, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-42081 and fix it if it is affected.\n\nWhat it is: CVE-2026-42081 is a medium-severity vulnerability in Free5gc Free5gc, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42081 exists.\n\nAffected packages and fixed versions:\n- github.com/free5gc/amf (Go): affected all versions; no fix listed\n- github.com/free5gc/amf (Go): affected all versions up to 1.4.3; no fix listed\n- github.com/free5gc/amf (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-2026-42081/ (Markdown: https://insights.sbomify.com/CVE-2026-42081/index.md)","id":"CVE-2026-42081","markdown":"https://insights.sbomify.com/CVE-2026-42081/index.md","name":"CVE-2026-42081","record":{"aliases":["GHSA-77x9-rf64-92gv","GO-2026-5209"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service","security_bypass"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"5G core network","requires_auth":"none","summary":"A malicious gNB can bypass UE security capability checks in free5GC AMF, causing persistent handover denial-of-service for users.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"free5gc","vendor":"free5gc"}],"cvss":{"score":6.1,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-358","name":"Improperly Implemented Security Check for Standard"}],"description":"free5GC is an open-source implementation of the 5G core network. Prior to 4.2.2, the AMF in Free5GC does not verify the UE Security Capabilities received in NGAP PathSwitchRequest messages against its locally stored values, as mandated by 3GPP TS 33.501 §6.7.3.1. A malicious gNB can overwrite the AMF's stored UE security capabilities with arbitrary values, which are then propagated in PathSwitchRequest Acknowledge messages and subsequent Handover Request messages. This leads to persistent handover denial-of-service for affected UEs. 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: UE Security Capability bypass on NGAP PathSwitchRequest","id":"CVE-2026-42081","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"free5gc:free5gc","products":["free5gc:free5gc"],"type":"security_feature_bypass","year":"2026"},"n_packages":3,"n_references":1,"next":{"headline":"free5GC: Missing Concurrent NAS SMC Validation During NGAP Handover","id":"CVE-2026-42082"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/free5gc/amf","purl":"pkg:golang/github.com/free5gc/amf","source":"GO-2026-5209"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.4.3"],"package":"github.com/free5gc/amf","purl":null,"source":"GHSA-77x9-rf64-92gv"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":["1.4.3"],"package":"github.com/free5gc/amf","purl":"pkg:golang/github.com/free5gc/amf","source":"GHSA-77x9-rf64-92gv"}],"prev":{"headline":"PPTAgent: Arbitrary File Write via `save_generated_slides`","id":"CVE-2026-42080"},"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":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-27","vendors":["free5gc"]},"summary":"A malicious gNB can bypass UE security capability checks in free5GC AMF, causing persistent handover denial-of-service for users.","url":"https://insights.sbomify.com/CVE-2026-42081/"}