CVE-2026-27171
Quick assessment
Affected
zlib zlib
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
zlib是美国Mark Adler个人开发者的一个通用的数据压缩库。 zlib 1.3.2之前版本存在安全漏洞，该漏洞源于crc32_combine64和crc32_combine_gen64函数中的x2nmodp可以在没有终止条件的循环内进行右移操作，可能导致CPU消耗。
Possible ATT&CK Techniques 1 AI
T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-27171
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5
Vulnerability Title
zlib 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
zlib是美国Mark Adler个人开发者的一个通用的数据压缩库。 zlib 1.3.2之前版本存在安全漏洞，该漏洞源于crc32_combine64和crc32_combine_gen64函数中的x2nmodp可以在没有终止条件的循环内进行右移操作，可能导致CPU消耗。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-27171
| # | POC Description | Source Link | Shenlong Link |
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AI-Generated POC
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V. Comments for CVE-2026-27171
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