OALDERS WWW::Mechanize::Cached up to 1.x on Perl HTTP Response /tmp/FileCache get permission assignment

Summaryinfo

A vulnerability described as problematic has been identified in OALDERS WWW::Mechanize::Cached up to 1.x on Perl. Affected is the function get of the file /tmp/FileCache of the component HTTP Response Handler. The manipulation results in permission assignment. This vulnerability is known as CVE-2026-8612. Attacking locally is a requirement. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in OALDERS WWW::Mechanize::Cached up to 1.x on Perl. It has been classified as problematic. Affected is the function get of the file /tmp/FileCache of the component HTTP Response Handler. The manipulation with an unknown input leads to a permission assignment vulnerability. CWE is classifying the issue as CWE-732. The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-8612 since 05/14/2026. The exploitability is told to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit.

Upgrading to version 2.00 eliminates this vulnerability. Applying the patch b821647deeedf83490ebc1db91d959d942300ce0 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• OALDERS

Name

• WWW::Mechanize::Cached

Version

• 1.x

License

• open-source

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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