{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-55785",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-17T14:40:28.380Z",
        "datePublished": "2026-08-28T22:25:06.814Z",
        "dateUpdated": "2026-08-28T22:25:06.814Z"
    },
    "containers": {
        "cna": {
            "title": "free5GC AUSF uses non-constant-time authentication comparisons and logs XRES* in 5G-AKA",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-208",
                            "lang": "en",
                            "description": "CWE-208: Observable Timing Discrepancy",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-385",
                            "lang": "en",
                            "description": "CWE-385: Covert Timing Channel",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-532",
                            "lang": "en",
                            "description": "CWE-532: Insertion of Sensitive Information into Log File",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "HIGH",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 3.7,
                        "baseSeverity": "LOW",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/free5gc/free5gc/security/advisories/GHSA-fp46-6vfw-gc9c",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/free5gc/free5gc/security/advisories/GHSA-fp46-6vfw-gc9c"
                },
                {
                    "name": "https://github.com/free5gc/ausf/pull/63",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/free5gc/ausf/pull/63"
                },
                {
                    "name": "https://github.com/free5gc/ausf/commit/7a5a4aa1ec6cd0e1febebf333911c3104968edf0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/free5gc/ausf/commit/7a5a4aa1ec6cd0e1febebf333911c3104968edf0"
                },
                {
                    "name": "https://github.com/free5gc/ausf/releases/tag/v1.4.5",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/free5gc/ausf/releases/tag/v1.4.5"
                }
            ],
            "affected": [
                {
                    "vendor": "free5gc",
                    "product": "free5gc",
                    "versions": [
                        {
                            "version": "< 1.4.5",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-28T22:25:06.814Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "source": {
                "advisory": "GHSA-fp46-6vfw-gc9c",
                "discovery": "UNKNOWN"
            }
        }
    }
}