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CVE-2026-8612— WWW::Mechanize::Cached versions before 2.00 for Perl deserialize cached HTTP responses from a world-writable on-disk cache, enabling local response forgery and code execution

Quick assessment

Affected
OALDERS WWW::Mechanize::Cached
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.

WWW::Mechanize::Cached是libwww-perl开源的一个用于 Perl 语言的开源模块，作为 WWW::Mechanize 的扩展。 WWW::Mechanize::Cached 2.00之前版本存在代码问题漏洞，该漏洞源于从世界可写的磁盘缓存反序列化缓存的HTTP响应，本地攻击者可以替换受害者已知URL的缓存条目为任意冻结的HTTP::Response blob，导致受害者下次get()该URL时返回攻击者控制的响应字节，并通过Storable::thaw升级为任意代码执行。

AI Predicted 5.4 Difficulty: Moderate EPSS 0.31% · P22

Affected Version Matrix 1

VendorProduct Version RangeStatus
OALDERS WWW::Mechanize::Cached < 2.00 affected
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I. Basic Information for CVE-2026-8612

Vulnerability Information
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Vulnerability Title
WWW::Mechanize::Cached versions before 2.00 for Perl deserialize cached HTTP responses from a world-writable on-disk cache, enabling local response forgery and code execution
Source: CVE Program / CVE List V5
Vulnerability Description
WWW::Mechanize::Cached versions before 2.00 for Perl deserialize cached HTTP responses from a world-writable on-disk cache, enabling local response forgery and code execution. With no explicit cache backend, WWW::Mechanize::Cached constructs a default Cache::FileCache under /tmp/FileCache without overriding the backend's documented directory_umask of 000, so the cache root and its subdirectories are created mode 0777 with no sticky bit. Cache entries are named by sha1_hex of the request and read back through Storable::thaw on the next cache hit. A local attacker with write access to the cache tree can replace a victim's cache entry for a known URL with an arbitrary frozen HTTP::Response blob, causing the victim's next get() of that URL to return attacker controlled response bytes. Because the bytes are passed to Storable::thaw, a victim process that has loaded any class with a side-effectful STORABLE_thaw, DESTROY, or overload hook can be escalated to arbitrary code execution.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
关键资源的不正确权限授予
Source: CVE Program / CVE List V5
Vulnerability Title
WWW::Mechanize::Cached 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WWW::Mechanize::Cached是libwww-perl开源的一个用于 Perl 语言的开源模块，作为 WWW::Mechanize 的扩展。 WWW::Mechanize::Cached 2.00之前版本存在代码问题漏洞，该漏洞源于从世界可写的磁盘缓存反序列化缓存的HTTP响应，本地攻击者可以替换受害者已知URL的缓存条目为任意冻结的HTTP::Response blob，导致受害者下次get()该URL时返回攻击者控制的响应字节，并通过Storable::thaw升级为任意代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OALDERS WWW::Mechanize::Cached 0 ~ 2.00 -

II. Public POCs for CVE-2026-8612

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III. Intelligence Information for CVE-2026-8612

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Patches & Fixes for CVE-2026-8612 (2)

Other References for CVE-2026-8612 (1)

IV. Related Vulnerabilities

Same vendor: OALDERS
Same weakness: CWE-732

V. Comments for CVE-2026-8612

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