CVE-2026-27171 (GCVE-0-2026-27171)
Vulnerability from cvelistv5 – Published: 2026-02-18 02:36 – Updated: 2026-02-18 02:44
VLAI?
Summary
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.
Severity ?
CWE
- CWE-1284 - Improper Validation of Specified Quantity in Input
Assigner
References
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "zlib",
"vendor": "zlib",
"versions": [
{
"lessThan": "1.3.2",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:zlib:zlib:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.3.2",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "LOW",
"baseScore": 2.9,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1284",
"description": "CWE-1284 Improper Validation of Specified Quantity in Input",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-02-18T02:44:09.091Z",
"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"shortName": "mitre"
},
"references": [
{
"url": "https://github.com/madler/zlib/issues/904"
},
{
"url": "https://7asecurity.com/reports/pentest-report-zlib-RC1.1.pdf"
},
{
"url": "https://7asecurity.com/blog/2026/02/zlib-7asecurity-audit/"
},
{
"url": "https://ostif.org/zlib-audit-complete/"
},
{
"url": "https://github.com/madler/zlib/releases/tag/v1.3.2"
}
],
"x_generator": {
"engine": "CVE-Request-form 0.0.1"
}
}
},
"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2026-27171",
"datePublished": "2026-02-18T02:36:19.509Z",
"dateReserved": "2026-02-18T02:36:19.339Z",
"dateUpdated": "2026-02-18T02:44:09.091Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-27171\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2026-02-18T04:16:01.263\",\"lastModified\":\"2026-02-18T04:16:01.263\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"cve@mitre.org\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L\",\"baseScore\":2.9,\"baseSeverity\":\"LOW\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":1.4,\"impactScore\":1.4}]},\"weaknesses\":[{\"source\":\"cve@mitre.org\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-1284\"}]}],\"references\":[{\"url\":\"https://7asecurity.com/blog/2026/02/zlib-7asecurity-audit/\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://7asecurity.com/reports/pentest-report-zlib-RC1.1.pdf\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://github.com/madler/zlib/issues/904\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://github.com/madler/zlib/releases/tag/v1.3.2\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://ostif.org/zlib-audit-complete/\",\"source\":\"cve@mitre.org\"}]}}"
}
}
Loading…
Loading…
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…