CVE-2026-4240

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-4240
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4240.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-4240
Published
2026-03-16T13:32:09.729Z
Modified
2026-07-15T17:43:40.885040Z
Severity
  • 5.5 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P CVSS Calculator
Summary
Open5GS CCA smf_s6b_sta_cb denial of service
Details

A vulnerability was determined in Open5GS up to 2.7.6. The affected element is the function smfgxccacb/smfgyccacb/smfs6baaacb/smfs6bstacb of the component CCA Handler. This manipulation causes denial of service. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. Upgrading to version 2.7.7 is sufficient to fix this issue. Patch name: 80eb484a6ab32968e755e628b70d1a9c64f012ec. Upgrading the affected component is recommended.

Database specific 
{
    "cwe_ids": [
        "CWE-404"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4240.json",
    "cna_assigner": "VulDB",
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "2.7.3"
                },
                {
                    "last_affected": "2.7.3"
                },
                {
                    "introduced": "2.7.4"
                },
                {
                    "last_affected": "2.7.4"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/open5gs/open5gs

Affected ranges

Type
GIT
Repo
https://github.com/open5gs/open5gs
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
318eeb49a7dcdff733dec60e02d9c60aefca2fb9
Fixed
80eb484a6ab32968e755e628b70d1a9c64f012ec
Database specific 
{
    "cpe": "cpe:2.3:a:open5gs:open5gs:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.7.7"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

2.*
2.7.0
2.7.1
2.7.2
2.7.5
2.7.6
v0.*
v0.1.0
v0.1.1
v0.2.0
v0.3.0
v0.3.1
v0.3.10
v0.3.2
v0.3.3
v0.3.4
v0.3.5
v0.3.6
v0.3.8
v0.4.1
v0.4.2
v0.4.3
v0.4.4
v0.5.0
v0.5.1
v0.5.2
v1.*
v1.0.0
v1.1.0
v1.2.0
v1.2.1
v1.2.2
v1.2.3
v1.2.4
v1.3.0
v2.*
v2.0.0
v2.0.18
v2.0.22
v2.1.0
v2.1.1
v2.1.3
v2.1.4
v2.1.5
v2.1.7
v2.2.0
v2.2.1
v2.2.6
v2.2.7
v2.2.8
v2.2.9
v2.3.0
v2.3.2
v2.3.6
v2.4.0
v2.4.1
v2.4.3
v2.4.4
v2.4.5
v2.4.7
v2.4.8
v2.4.9
v2.6.1
v2.6.2
v2.6.3
v2.6.4
v2.6.6
v2.7.0
v2.7.1
v2.7.2

Database specific

vanir_signatures 
[
    {
        "source": "https://github.com/open5gs/open5gs/commit/80eb484a6ab32968e755e628b70d1a9c64f012ec",
        "signature_version": "v1",
        "signature_type": "Line",
        "digest": {
            "line_hashes": [
                "286832280686897877386663269906374356152",
                "237047032260203517884579827715635620405",
                "116524115645494846346800667577386580350",
                "291154197191466349190884344106472321044",
                "53099392610014375379891174915329441325"
            ],
            "threshold": 0.9
        },
        "deprecated": false,
        "id": "CVE-2026-4240-097f0c1e",
        "target": {
            "file": "src/smf/gy-path.c"
        }
    },
    {
        "source": "https://github.com/open5gs/open5gs/commit/80eb484a6ab32968e755e628b70d1a9c64f012ec",
        "signature_version": "v1",
        "signature_type": "Function",
        "digest": {
            "function_hash": "130296096657943261152918749756700875650",
            "length": 4319.0
        },
        "deprecated": false,
        "id": "CVE-2026-4240-2f75c394",
        "target": {
            "function": "smf_s6b_sta_cb",
            "file": "src/smf/s6b-path.c"
        }
    },
    {
        "source": "https://github.com/open5gs/open5gs/commit/80eb484a6ab32968e755e628b70d1a9c64f012ec",
        "signature_version": "v1",
        "signature_type": "Function",
        "digest": {
            "function_hash": "92942622530081123800530463779408980798",
            "length": 4316.0
        },
        "deprecated": false,
        "id": "CVE-2026-4240-868baa39",
        "target": {
            "function": "smf_s6b_aaa_cb",
            "file": "src/smf/s6b-path.c"
        }
    },
    {
        "source": "https://github.com/open5gs/open5gs/commit/80eb484a6ab32968e755e628b70d1a9c64f012ec",
        "signature_version": "v1",
        "signature_type": "Function",
        "digest": {
            "function_hash": "48066293071339186820413693103493647171",
            "length": 8508.0
        },
        "deprecated": false,
        "id": "CVE-2026-4240-9e3e4749",
        "target": {
            "function": "smf_gy_cca_cb",
            "file": "src/smf/gy-path.c"
        }
    },
    {
        "source": "https://github.com/open5gs/open5gs/commit/80eb484a6ab32968e755e628b70d1a9c64f012ec",
        "signature_version": "v1",
        "signature_type": "Line",
        "digest": {
            "line_hashes": [
                "173173611972938205206480386988927771189",
                "237047032260203517884579827715635620405",
                "261541326721294318550410748630230460168",
                "83047868071616557476164884720546196498",
                "67408004420327051982254656160822854663",
                "237047032260203517884579827715635620405",
                "261541326721294318550410748630230460168",
                "83047868071616557476164884720546196498",
                "67408004420327051982254656160822854663"
            ],
            "threshold": 0.9
        },
        "deprecated": false,
        "id": "CVE-2026-4240-b7b2fbba",
        "target": {
            "file": "src/smf/s6b-path.c"
        }
    },
    {
        "source": "https://github.com/open5gs/open5gs/commit/80eb484a6ab32968e755e628b70d1a9c64f012ec",
        "signature_version": "v1",
        "signature_type": "Function",
        "digest": {
            "function_hash": "110292961675724856263265827935457661500",
            "length": 10609.0
        },
        "deprecated": false,
        "id": "CVE-2026-4240-c19707cc",
        "target": {
            "function": "smf_gx_cca_cb",
            "file": "src/smf/gx-path.c"
        }
    },
    {
        "source": "https://github.com/open5gs/open5gs/commit/80eb484a6ab32968e755e628b70d1a9c64f012ec",
        "signature_version": "v1",
        "signature_type": "Line",
        "digest": {
            "line_hashes": [
                "312222335752906932391640947031498928207",
                "237047032260203517884579827715635620405",
                "261541326721294318550410748630230460168",
                "197094743083022473270121504420999007094",
                "260351164589364287184851166644780048951"
            ],
            "threshold": 0.9
        },
        "deprecated": false,
        "id": "CVE-2026-4240-d237e515",
        "target": {
            "file": "src/smf/gx-path.c"
        }
    }
]
vanir_signatures_modified 
"2026-07-15T17:43:40Z"
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4240.json"