Prometheus: remote read endpoint allows denial of service via crafted snappy payload_CVE-2026-42154

{
    "lastseen": "",
    "description": "Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, the remote read endpoint (/api/v1/read) does not validate the declared decoded length in a snappy-compressed request body before allocating memory. An unauthenticated attacker can send a small payload that causes a huge heap allocation per request. Under concurrent load this can exhaust available memory and crash the Prometheus process. This issue has been patched in versions 3.5.3 and 3.11.3.",
    "published": "2026-05-04T18:13:12.340Z",
    "modified": "2026-05-04T18:13:12.340Z",
    "type": "cve",
    "title": "Prometheus: remote read endpoint allows denial of service via crafted snappy payload",
    "source": "GitHub_M",
    "references": "https://github.com/prometheus/prometheus/security/advisories/GHSA-8rm2-7qqf-34qm\nhttps://github.com/prometheus/prometheus/pull/18584\nhttps://github.com/prometheus/prometheus/pull/18585\nhttps://github.com/prometheus/prometheus/releases/tag/v3.11.3\nhttps://github.com/prometheus/prometheus/releases/tag/v3.5.3",
    "id": "CVE-2026-42154",
    "bulletinFamily": "",
    "cwe": [
        "CWE-400",
        "CWE-789"
    ],
    "cvelist": null,
    "sourceData": "prometheus prometheus < 3.5.3\nprometheus prometheus >= 3.6.0, < 3.11.3",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "prometheus",
    "version": "< 3.5.3",
    "vendor": "prometheus",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}