CVE-2026-27171_CVE-2026-27171

2.9 / 10

LOW

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Description

zlib before 1.3.2 allows CPU consumption via crc32_combine64 and crc32_combine_gen64 because x2nmodp can do right shifts within a loop that has no termination condition.

Basic Information

ID CVE-2026-27171

Source mitre

Published Feb 18, 2026 at 02:36

Modified Feb 18, 2026 at 02:44

Affected Product

Vendor zlib

Product zlib

Affected Versions zlib zlib 0

CWE Classification

CWE-1284

References

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    "lastseen": "",
    "description": "zlib before 1.3.2 allows CPU consumption via crc32_combine64 and crc32_combine_gen64 because x2nmodp can do right shifts within a loop that has no termination condition.",
    "published": "2026-02-18T02:36:19.509Z",
    "modified": "2026-02-18T02:44:09.091Z",
    "type": "cve",
    "title": "CVE-2026-27171",
    "source": "mitre",
    "references": "https://github.com/madler/zlib/issues/904\nhttps://7asecurity.com/reports/pentest-report-zlib-RC1.1.pdf\nhttps://7asecurity.com/blog/2026/02/zlib-7asecurity-audit/\nhttps://ostif.org/zlib-audit-complete/\nhttps://github.com/madler/zlib/releases/tag/v1.3.2",
    "id": "CVE-2026-27171",
    "bulletinFamily": "",
    "cwe": [
        "CWE-1284"
    ],
    "cvelist": null,
    "sourceData": "zlib zlib 0",
    "sourceHref": "",
    "cvss": {
        "score": 2.9,
        "severity": "LOW",
        "vector": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
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            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "zlib",
    "version": "0",
    "vendor": "zlib",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
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    "ai_score": 0
}