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

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Summary

CVECVE-2026-8612
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-15 02:16:23 UTC
Updated2026-05-15 06:16:20 UTC
DescriptionWWW::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.

Risk And Classification

Problem Types: CWE-502 | CWE-732 | CWE-732 CWE-732 Incorrect Permission Assignment for Critical Resource | CWE-502 CWE-502 Deserialization of Untrusted Data

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OALDERS WWWMechanizeCached affected 2.00 custom Not specified

References

ReferenceSourceLinkTags
github.com/libwww-perl/WWW-Mechanize-Cached/pull/36 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
www.openwall.com/lists/oss-security/2026/05/15/1 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
github.com/libwww-perl/WWW-Mechanize-Cached/commit/b821647deeedf83490ebc... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
metacpan.org/release/OALDERS/WWW-Mechanize-Cached-2.00/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-05-13T00:00:00.000ZIssue reported.
CNA2026-05-14T00:00:00.000ZWWW-Mechanize-Cached 2.00 released with fix.

Solutions

CNA: Upgrade to WWW-Mechanize-Cached 2.00 or later.

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