{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64613", "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "state": "PUBLISHED", "assignerShortName": "CPANSec", "dateReserved": "2026-07-20T11:30:10.287Z", "datePublished": "2026-07-21T19:05:49.579Z", "dateUpdated": "2026-07-21T19:05:49.579Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "Data-Buffer-Shared", "product": "Data::Buffer::Shared", "programFiles": ["buf_generic.h"], "repo": "https://github.com/vividsnow/perl5-data-buffer-shared", "vendor": "EGOR", "versions": [{"lessThan": "0.05", "status": "affected", "version": "0", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_NOFOLLOW.\n\nThe segment is created in buf_generic.h with open(path, O_RDWR|O_CREAT|O_EXCL, 0666). O_EXCL blocks a pre-seeded file on create, but the mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable), and O_NOFOLLOW is absent, so a symlink planted at the path is followed when the segment is attached.\n\nA \"Shared\" segment naturally lives in a shared directory such as /tmp or /dev/shm, where any local user can read the IPC payloads stored in the world-readable segment, and a pre-planted symlink at the path redirects the open to another file."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-732", "description": "CWE-732 Incorrect Permission Assignment for Critical Resource", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-59", "description": "CWE-59 Improper Link Resolution Before File Access", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "shortName": "CPANSec", "dateUpdated": "2026-07-21T19:05:49.579Z"}, "references": [{"url": "https://metacpan.org/release/EGOR/Data-Buffer-Shared-0.05/diff/EGOR/Data-Buffer-Shared-0.04#buf_generic.h"}, {"tags": ["release-notes"], "url": "https://metacpan.org/release/EGOR/Data-Buffer-Shared-0.05/changes"}], "solutions": [{"lang": "en", "value": "Upgrade to Data::Buffer::Shared 0.05 or later, which creates the backing file mode 0600 (owner-only) with O_NOFOLLOW."}], "source": {"discovery": "UNKNOWN"}, "title": "Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_NOFOLLOW", "workarounds": [{"lang": "en", "value": "For deployments that cannot upgrade to 0.05, set a restrictive umask so the backing file is not world-readable and place it in a directory only the owning user can access."}], "x_generator": {"engine": "cpansec-cna-tool 0.1"}}}}

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