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CVE-2026-87082— Net::IDN::Punycode versions before 2.590 for Perl hang, crash or return a wrong label via unvalidated malformed UTF-8 in encode_punycode

一分钟漏洞结论

影响对象
CVE-2026-87082
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 hang, crash or return a wrong label via unvalidated malformed UTF-8 in encode_punycode. Neither backend checks that its input is well-formed UTF-8, so a string with the UTF-8 flag set over malformed bytes, as t

AI 预测 5.3 利用难度: 中等 EPSS 0.16% · P6

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-2026-87082 基础信息

漏洞信息

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Vulnerability Title
Net::IDN::Punycode versions before 2.590 for Perl hang, crash or return a wrong label via unvalidated malformed UTF-8 in encode_punycode
来源: CVE Program / CVE List V5
Vulnerability Description
Net::IDN::Punycode versions before 2.590 for Perl hang, crash or return a wrong label via unvalidated malformed UTF-8 in encode_punycode. Neither backend checks that its input is well-formed UTF-8, so a string with the UTF-8 flag set over malformed bytes, as the :utf8 PerlIO layer produces from any malformed input, reaches the encoder unchecked. On perl 5.32 and later the XS backend reports a malformed sequence with a length of `(STRLEN)-1`, so the scan steps back one byte instead of forward and never ends. On earlier perls the XS returns a valid label for a different name. The pure-Perl backend runs a regex over the flagged string. Depending on the bytes, it aborts with SIGBUS on perl 5.28 and later, dies with a panic, or returns a wrong label. The documented conversion functions match the label against Unicode properties first and that match dies on such a string, so only a direct call to encode_punycode reaches the defect. The decoder is not affected. A direct caller encoding attacker-supplied bytes hangs, crashes or gets a label for a name the input never held.
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
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-2026-87082 的公开POC

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三、漏洞 CVE-2026-87082 的情报信息

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CVE-2026-87082 补丁与修复 (4)

CVE-2026-87082 其他参考 (1)

IV. Related Vulnerabilities

Same weakness: CWE-835

V. Comments for CVE-2026-87082

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