{"id":"CVE-2026-8612","summary":"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","details":"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.\n\nWith 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.\n\nA 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.","modified":"2026-07-08T08:10:43.320382288Z","published":"2026-05-15T01:11:55.018Z","database_specific":{"cna_assigner":"CPANSec","cwe_ids":["CWE-502","CWE-732"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8612.json"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/05/15/1"},{"type":"WEB","url":"https://cpan.org/modules"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/8xxx/CVE-2026-8612.json"},{"type":"ADVISORY","url":"https://metacpan.org/release/OALDERS/WWW-Mechanize-Cached-2.00/changes"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8612"},{"type":"FIX","url":"https://github.com/libwww-perl/WWW-Mechanize-Cached/commit/b821647deeedf83490ebc1db91d959d942300ce0.patch"},{"type":"FIX","url":"https://github.com/libwww-perl/WWW-Mechanize-Cached/pull/36"},{"type":"PACKAGE","url":"https://github.com/libwww-perl/WWW-Mechanize-Cached"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/libwww-perl/www-mechanize-cached","events":[{"introduced":"0"},{"fixed":"b9a6ba82cf9cfe0cb7d801ef9f924c7383b28108"},{"fixed":"b821647deeedf83490ebc1db91d959d942300ce0"}],"database_specific":{"cpe":"cpe:2.3:a:oalders:www\\:\\:mechanize\\:\\:cached:*:*:*:*:*:perl:*:*","extracted_events":[{"introduced":"0"},{"fixed":"2.00"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["v1.56","v1.55","v1.54","v1.53","v1.52","v1.51","v1.50","v1.49","v1.48","v1.47","v1.46","v1.45","v1.44","v1.43","v1.42","v1.41","v1.40","v1.39","v1.38","v1.37","v1.36"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-8612.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L"}]}