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CVE-2026-87079— Net::IDN::Punycode versions before 2.590 for Perl allow CPU exhaustion via quadratic insertion cost when decoding a long label in decode_punycode

一分钟漏洞结论

影响对象
CVE-2026-87079
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Net::IDN::Punycode versions before 2.590 for Perl allow CPU exhaustion via quadratic insertion cost when decoding a long label in decode_punycode. The XS backend inserts each decoded code point into a UTF-8 buffer and finds the insertion point by scanning that

EPSS 0.15% · P5

影响版本矩阵 1

厂商产品 版本范围状态
None None < 2.590 affected

一、 漏洞 CVE-2026-87079 基础信息

漏洞信息

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Vulnerability Title
Net::IDN::Punycode versions before 2.590 for Perl allow CPU exhaustion via quadratic insertion cost when decoding a long label in decode_punycode
来源: CVE Program / CVE List V5
Vulnerability Description
Net::IDN::Punycode versions before 2.590 for Perl allow CPU exhaustion via quadratic insertion cost when decoding a long label in decode_punycode. The XS backend inserts each decoded code point into a UTF-8 buffer and finds the insertion point by scanning that buffer from the start, one character at a time. The scan runs once per code point over the output built so far, so the cost is quadratic in the label length. The pure-Perl backend downgrades its input to bytes so that substr can index it directly, but takes its working copy before the downgrade, so when the input carries the UTF-8 flag every substr on the copy scans from the start, with the same quadratic cost. Nothing bounds the label length in the to-Unicode direction. The 63-byte DNS limit is checked only when converting to ASCII, so domain_to_unicode and uts46_to_unicode pass an attacker-supplied label of any length to the decoder.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
- - 0 ~ 2.590 -

二、漏洞 CVE-2026-87079 的公开POC

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三、漏洞 CVE-2026-87079 的情报信息

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CVE-2026-87079 补丁与修复 (2)

CVE-2026-87079 其他参考 (1)

IV. Related Vulnerabilities

Same weakness: CWE-407

V. Comments for CVE-2026-87079

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