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CVE-2026-116268— MIME::Field::ParamVal versions before 5.521 for Perl allow CPU exhaustion via unclosed comments in header parameters

Quick assessment

Affected
CVE-2026-116268
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.

在 Perl 环境中，MIME::Field::ParamVal 5.521 版本之前的版本存在漏洞，攻击者可通过在邮件头参数中插入未闭合的注释，导致 CPU 资源耗尽。 该漏洞源于解析 Content-Type 和 Content-Disposition 参数时使用的注释匹配模式：该模式会从每个左括号 "(" 开始扫描，直到遇到下一个右括号 ")"。若某字段中不存在右括号，则每个左括号都会触发扫描直至字段末尾并失败，导致解析时间与字段长度的平方成正比。此外，该字段会在每次属性查找时重复解析，而每个 MIME 实体

AI Predicted 5.9 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None < 5.521 affected

I. Basic Information for CVE-2026-116268

Vulnerability Information
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Vulnerability Title
MIME::Field::ParamVal versions before 5.521 for Perl allow CPU exhaustion via unclosed comments in header parameters
Source: CVE Program / CVE List V5
Vulnerability Description
MIME::Field::ParamVal versions before 5.521 for Perl allow CPU exhaustion via unclosed comments in header parameters. The comment pattern used to parse Content-Type and Content-Disposition parameters scans from each "(" to the next ")". In a field with no ")", every "(" scans to the end of the header and fails, so parsing takes time quadratic in the header length. The field is parsed again on each attribute lookup, several times per MIME entity. A 40 KB header takes about 7 seconds to parse once.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 5.521 -

II. Public POCs for CVE-2026-116268

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III. Intelligence Information for CVE-2026-116268

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Other References for CVE-2026-116268 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1333