CVE-2026-55785

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Source
https://cve.org/CVERecord?id=CVE-2026-55785
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-55785.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-55785
Aliases
Downstream
openSUSE (1)
SUSE (2)
Related
openSUSE (1)
SUSE (2)
Published
2026-08-28T22:25:06Z
Modified
2026-10-16T02:35:59Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
free5GC AUSF uses non-constant-time authentication comparisons and logs XRES* in 5G-AKA
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.

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"
}
References

Affected packages

Git / github.com/free5gc/ausf

Affected ranges

Type
GIT
Repo
https://github.com/free5gc/ausf
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
b74ee7dafec5975e3440ae95125994565cfb0496
Fixed
7a5a4aa1ec6cd0e1febebf333911c3104968edf0
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "1.4.5"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StringRangeExpression"
        },
        {
            "range": [
                {
                    "fixed": "7a5a4aa1ec6cd0e1febebf333911c3104968edf0"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v1.4.5",
            "range": [
                {
                    "fixed": "b74ee7dafec5975e3440ae95125994565cfb0496"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

v1.*
v1.0.0
v1.0.1
v1.0.2
v1.1.0
v1.1.1
v1.2.0
v1.2.1
v1.2.2
v1.2.3
v1.2.4
v1.3.0
v1.3.1
v1.3.2
v1.4.0
v1.4.1
v1.4.2
v1.4.3
v1.4.4

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-55785.json"