{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.4.5"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7a5a4aa1ec6cd0e1febebf333911c3104968edf0"
            },
            {
              "fixed": "b74ee7dafec5975e3440ae95125994565cfb0496"
            }
          ],
          "repo": "https://github.com/free5gc/ausf",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-fp46-6vfw-gc9c"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-208",
      "CWE-385",
      "CWE-532"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55785.json"
  },
  "details": "free5GC is an open-source implementation of the 5G core network. Prior to 1.4.5, the AUSF component performs cryptographic authentication comparisons in internal/sbi/processor/ue_authentication.go with ordinary equality helpers. Auth5gAkaComfirmRequestProcedure compares RES* and XRES* with strings.EqualFold and logs the expected XRES* value at INFO level before comparison. EapAuthComfirmRequestProcedure compares AT_MAC and XMAC with bytes.Equal and evaluates XRES == RES with ordinary string equality. These comparisons can return at mismatch-dependent times, although testing did not demonstrate a practical remote timing oracle because of HTTP/SBI timing noise. The INFO log exposes authentication material to operators, log collectors, sidecars, or processes able to read AUSF logs. This issue is fixed in version 1.4.5.",
  "id": "CVE-2026-55785",
  "modified": "2026-08-30T03:30:31.432482346Z",
  "published": "2026-08-28T22:25:06.814Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/free5gc/ausf/releases/tag/v1.4.5"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55785.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-fp46-6vfw-gc9c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55785"
    },
    {
      "type": "FIX",
      "url": "https://github.com/free5gc/ausf/commit/7a5a4aa1ec6cd0e1febebf333911c3104968edf0"
    },
    {
      "type": "FIX",
      "url": "https://github.com/free5gc/ausf/pull/63"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "free5GC AUSF uses non-constant-time authentication comparisons and logs XRES* in 5G-AKA"
}