{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64617", "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "state": "PUBLISHED", "assignerShortName": "CPANSec", "dateReserved": "2026-07-20T11:30:10.287Z", "datePublished": "2026-07-21T19:07:06.617Z", "dateUpdated": "2026-07-21T19:07:06.617Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "Data-PubSub-Shared", "product": "Data::PubSub::Shared", "programFiles": ["pubsub.h"], "repo": "https://github.com/vividsnow/perl5-data-pubsub-shared", "vendor": "EGOR", "versions": [{"lessThan": "0.07", "status": "affected", "version": "0", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "Data::PubSub::Shared versions before 0.07 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW.\n\nThe segment is created in pubsub.h with open(path, O_RDWR|O_CREAT, 0666). The mode is 0666, so under the default umask 022 the file is created mode 0644 (world-readable). O_NOFOLLOW is absent, so a symlink planted at the path is followed, and O_EXCL is absent, so the open silently uses a pre-planted file instead of failing.\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 file or symlink at the path lets a local attacker win a pre-creation race or redirect the open."}], "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": "2026-07-21T19:07:06.617Z"}, "references": [{"url": "https://metacpan.org/release/EGOR/Data-PubSub-Shared-0.07/diff/EGOR/Data-PubSub-Shared-0.06#pubsub.h"}, {"tags": ["release-notes"], "url": "https://metacpan.org/release/EGOR/Data-PubSub-Shared-0.07/changes"}], "solutions": [{"lang": "en", "value": "Upgrade to Data::PubSub::Shared 0.07 or later, which creates the backing file mode 0600 (owner-only) with O_EXCL and O_NOFOLLOW."}], "source": {"discovery": "UNKNOWN"}, "title": "Data::PubSub::Shared versions before 0.07 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW", "workarounds": [{"lang": "en", "value": "For deployments that cannot upgrade to 0.07, 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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