OpenBSD mpls_do_error Kernel Stack Memory Disclosure via MPLS Input_CVE-2026-56099

{
    "lastseen": "",
    "description": "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.",
    "published": "2026-06-18T19:29:08.271Z",
    "modified": "2026-06-18T19:29:08.271Z",
    "type": "cve",
    "title": "OpenBSD mpls_do_error Kernel Stack Memory Disclosure via MPLS Input",
    "source": "VulnCheck",
    "references": "https://pop.argus-systems.ai/advisory/adv-040.html\nhttps://github.com/openbsd/src/commit/6a23123ec05f1eb29cfcaae0f3a468b2e1983cfd\nhttps://www.vulncheck.com/advisories/openbsd-mpls-do-error-kernel-stack-memory-disclosure-via-mpls-input",
    "id": "CVE-2026-56099",
    "bulletinFamily": "",
    "cwe": [
        "CWE-125"
    ],
    "cvelist": null,
    "sourceData": "openbsd src 0",
    "sourceHref": "",
    "cvss": {
        "score": 6.9,
        "severity": "MEDIUM",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "src",
    "version": "0",
    "vendor": "openbsd",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}