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CVE-2026-116273— MIME::Parser versions before 5.521 for Perl set no limit on the number of message parts by default, allowing memory exhaustion

Quick assessment

Affected
CVE-2026-116273
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.

Perl 的 MIME::Parser 模块在 5.521 版本之前，默认未对邮件部分（message parts）的数量设置任何限制，从而导致内存耗尽漏洞。 其 选项的默认值为 -1，该值表示禁用限制。因此，使用默认配置创建的解析器会为邮件中的每一个部分构建一个实体对象，无论邮件包含多少个部分。 5.521 版本将 的默认值设为 1000，并将 的默认值设为 64。若将其中任一选项显式设置为 -1，仍会移除相应限制。

AI Predicted 7.5 Difficulty: Trivial EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None < 5.521 affected

I. Basic Information for CVE-2026-116273

Vulnerability Information
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Vulnerability Title
MIME::Parser versions before 5.521 for Perl set no limit on the number of message parts by default, allowing memory exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
MIME::Parser versions before 5.521 for Perl set no limit on the number of message parts by default, allowing memory exhaustion. The max_parts option defaulted to -1, which disables the limit, so a parser created with default settings builds an entity for every part however many a message has. Version 5.521 sets max_parts to 1000 and max_depth to 64 by default. Setting either to -1 still removes the limit.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不安全的默认资源初始化
Source: CVE Program / CVE List V5

Affected Products

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

II. Public POCs for CVE-2026-116273

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III. Intelligence Information for CVE-2026-116273

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Other References for CVE-2026-116273 (1)

IV. Related Vulnerabilities

Same weakness: CWE-1188