Perl日期解析正则表达式拒绝服务漏洞(CVE-2026-14741)及修复代码

漏洞概述 该漏洞涉及在解析日期时，由于正则表达式的贪婪匹配和回溯问题，可能导致拒绝服务（DoS）攻击。具体而言，当输入字符串超过64个字符时，解析器会尝试进行大量的回溯操作，从而消耗大量CPU资源，导致服务不可用。 影响范围 受影响模块： 函数 受影响版本：未明确指定，但补丁中提到修复了 CVE-2026-14741 攻击条件：输入字符串长度超过64个字符 修复方案 1. 添加长度检查：在解析日期之前，首先检查输入字符串的长度，如果超过64个字符，则直接拒绝处理。 2. 优化正则表达式：确保正则表达式不会因长输入而产生过多的回溯。 3. 增加测试用例：添加测试用例以验证修复的有效性，确保长输入字符串能够被正确拒绝。 POC代码 以下是修复后的 函数代码： ```perl sub parse_date ($) { my $s = shift; return unless defined; Reject over-long input up front, before any regex runs, so hostile strings cannot drive the parsing regexes into pathological backtracking. Length is measured as given (leading/trailing whitespace included). This cap is a security limit, not a tunable: every format we accept is far shorter, and the parsing regexes still contain adjacent unbounded quantifiers, so raising it demands re-benchmarking against hostile input. return if length($s) > 64; More lax parsing below s/^\s+//; kill leading space s/^\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\s([A-Za-z]{3})\

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Perl日期解析正则表达式拒绝服务漏洞(CVE-2026-14741)及修复代码

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Perl日期解析正则表达式拒绝服务漏洞(CVE-2026-14741)及修复代码

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