CVE-2026-56099

See a problem?
Please try reporting it to the source first.

Source

https://cve.org/CVERecord?id=CVE-2026-56099

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56099.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-56099

Published

2026-06-18T19:29:08Z

Modified

2026-10-28T11:10:01Z

Severity

6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

OpenBSD mpls_do_error Kernel Stack Memory Disclosure via MPLS Input

Details

OpenBSD before commit 6a23123 (2026-06-18) contains an out-of-bounds read vulnerability in the mpls_do_error function within sys/netmpls/mpls_input.c that allows remote attackers to disclose kernel stack memory by sending crafted MPLS frames with 16 labels and no Bottom-of-Stack bit set.

Database specific

{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56099.json"
}

References

Affected packages

Git / github.com/openbsd/src

Affected ranges

Type

GIT

Repo

https://github.com/openbsd/src

Events

Introduced

Fixed

6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd

Database specific

Show details

{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "0"
                },
                {
                    "fixed": "6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "fixed": "6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd"
                }
            ],
            "source": "REFERENCES_COMMIT"
        }
    ]
}

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56099.json"

vanir_signatures

[
    {
        "deprecated": false,
        "digest": {
            "line_hashes": [
                "214501725817765619687789676424629373910",
                "171745048645506414789133289662303457947",
                "183165387675308835546541401840556237993",
                "270311563117041349745719620477978035278",
                "335522886547838601549901776027989373454"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2026-56099-743cd715",
        "signature_type": "Line",
        "signature_version": "v1",
        "source": "https://github.com/openbsd/src/commit/6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd",
        "target": {
            "file": "sys/netmpls/mpls_input.c"
        }
    },
    {
        "deprecated": false,
        "digest": {
            "function_hash": "290605894353759007932632249171159928095",
            "length": 2430
        },
        "id": "CVE-2026-56099-b2790f1d",
        "signature_type": "Function",
        "signature_version": "v1",
        "source": "https://github.com/openbsd/src/commit/6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd",
        "target": {
            "file": "sys/netmpls/mpls_input.c",
            "function": "mpls_do_error"
        }
    }
]

vanir_signatures_modified

"2026-10-28T11:10:01Z"