{"id":"CVE-2026-4988","aliases":["EUVD-2026-16895","GHSA-2678-g677-r4gx"],"status":"published","title":"Open5GS CCA Message smf_s6b denial of service","description":"A security flaw has been discovered in Open5GS 2.7.6. This issue affects the function smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b of the component CCA Message Handler. The manipulation results in denial of service. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is assessed as difficult. The exploit has been released to the public and may be used for attacks.","severity":{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00576,"percentile":0.47862,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-404"],"published":"2026-03-27T21:27:16Z","modified":"2026-10-28T02:30:54Z","products":[{"vendor":"open5gs","product":"open5gs"}],"references":[{"url":"https://vuldb.com/?id.353875","tags":["vdb-entry","technical-description","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://vuldb.com/?ctiid.353875","tags":["signature","permissions-required","Permissions Required","VDB Entry","report"]},{"url":"https://vuldb.com/?submit.771349","tags":["third-party-advisory","Exploit","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://github.com/open5gs/open5gs/issues/4342","tags":["issue-tracking","Exploit","Issue Tracking","report"]},{"url":"https://github.com/open5gs/open5gs/issues/4342#issue-4021772232","tags":["exploit","issue-tracking","Issue Tracking","report"]},{"url":"https://github.com/open5gs/open5gs/","tags":["product","Product","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4988","tags":["advisory"]},{"url":"https://github.com/open5gs/open5gs"},{"url":"https://github.com/advisories/GHSA-2678-g677-r4gx"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4988.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-4988","title":"Open5GS CCA Message smf_s6b denial of service","description":"A security flaw has been discovered in Open5GS 2.7.6. This issue affects the function smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b of the component CCA Message Handler. The manipulation results in denial of service. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is assessed as difficult. The exploit has been released to the public and may be used for attacks.","status":"published","published":"2026-03-27T21:27:16.379Z","modified":"2026-03-30T17:42:11.269Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium","assessor":"cna"},{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R","level":"low","assessor":"cna"},{"version":"3.0","score":3.7,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R","level":"low","assessor":"cna"},{"version":"2.0","score":2.6,"vector":"AV:N/AC:H/Au:N/C:N/I:N/A:P/E:POC/RL:ND/RC:UR","assessor":"cna"}],"cwes":["CWE-404"],"updated_at":"2026-11-02T14:19:58.944663Z"}],"euvd":[{"id":"EUVD-2026-16895","description":"A security flaw has been discovered in Open5GS 2.7.6. This issue affects the function smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b of the component CCA Message Handler. The manipulation results in denial of service. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is assessed as difficult. The exploit has been released to the public and may be used for attacks.","status":"published","published":"2026-03-27T21:27:16Z","modified":"2026-03-30T17:42:11Z","cvss":[{"version":"4.0","score":6.3,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"medium"}],"updated_at":"2026-11-02T19:25:25.878486Z"}],"ghsa":[{"id":"GHSA-2678-g677-r4gx","title":"A security flaw has been discovered in Open5GS 2.7.6. This issue affects the function...","description":"A security flaw has been discovered in Open5GS 2.7.6. This issue affects the function smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b of the component CCA Message Handler. The manipulation results in denial of service. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is assessed as difficult. The exploit has been released to the public and may be used for attacks.","status":"published","published":"2026-03-28T00:31:16Z","modified":"2026-03-28T00:31:24Z","cvss":[{"version":"4.0","score":2.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"},{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"cwes":["CWE-404"],"updated_at":"2026-11-02T15:06:54.610516Z"}],"nvd":[{"id":"CVE-2026-4988","description":"A security flaw has been discovered in Open5GS 2.7.6. This issue affects the function smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b of the component CCA Message Handler. The manipulation results in denial of service. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is assessed as difficult. The exploit has been released to the public and may be used for attacks.","status":"published","published":"2026-03-27T22:16:23.533Z","modified":"2026-06-17T10:57:33.217Z","cvss":[{"version":"4.0","score":2.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"secondary"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":2.6,"vector":"AV:N/AC:H/Au:N/C:N/I:N/A:P","level":"low","assessor":"secondary"}],"cwes":["CWE-404"],"updated_at":"2026-11-02T14:12:11.678711Z"}],"osv":[{"id":"CVE-2026-4988","title":"Open5GS CCA Message smf_s6b denial of service","description":"A security flaw has been discovered in Open5GS 2.7.6. This issue affects the function smf_gx_cca_cb/smf_gy_cca_cb/smf_s6b of the component CCA Message Handler. The manipulation results in denial of service. The attack may be launched remotely. Attacks of this nature are highly complex. The exploitability is assessed as difficult. The exploit has been released to the public and may be used for attacks.","status":"published","published":"2026-03-27T21:27:16.379Z","modified":"2026-10-28T02:30:54.25206643Z","cvss":[{"version":"4.0","score":2.9,"vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P","level":"low"}],"cwes":["CWE-404"],"updated_at":"2026-11-02T15:45:07.060148Z"}]}}