{"id":"CVE-2026-64614","state":"PUBLISHED","title":"Data::Deque::Shared versions before 0.06 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW","description":"Data::Deque::Shared versions before 0.06 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW.\n\nThe segment is created in deque.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.","publishedAt":"2026-07-21T19:06:15.526Z","updatedAt":"2026-07-23T12:40:40.462Z","severity":{"score":3.8,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N","source":"CISA-ADP"},"assigner":"CPANSec","products":["EGOR Data::Deque::Shared"],"affected":[{"vendor":"EGOR","product":"Data::Deque::Shared","packageName":"Data-Deque-Shared","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.06","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","programFiles":["deque.h"],"repo":"https://github.com/vividsnow/perl5-data-deque-shared"}],"references":["https://metacpan.org/release/EGOR/Data-Deque-Shared-0.06/diff/EGOR/Data-Deque-Shared-0.05#deque.h","https://metacpan.org/release/EGOR/Data-Deque-Shared-0.06/changes"],"weaknesses":["CWE-732","CWE-59"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64614.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64614","state":"PUBLISHED","datePublished":"2026-07-21T19:06:15.526Z","dateUpdated":"2026-07-23T12:40:40.462Z","assignerShortName":"CPANSec","assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateReserved":"2026-07-20T11:30:10.287Z"},"containers":{"cna":{"title":"Data::Deque::Shared versions before 0.06 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW","descriptions":[{"lang":"en","value":"Data::Deque::Shared versions before 0.06 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW.\n\nThe segment is created in deque.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."}],"affected":[{"vendor":"EGOR","product":"Data::Deque::Shared","packageName":"Data-Deque-Shared","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.06","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","programFiles":["deque.h"],"repo":"https://github.com/vividsnow/perl5-data-deque-shared"}],"references":[{"url":"https://metacpan.org/release/EGOR/Data-Deque-Shared-0.06/diff/EGOR/Data-Deque-Shared-0.05#deque.h"},{"url":"https://metacpan.org/release/EGOR/Data-Deque-Shared-0.06/changes","tags":["release-notes"]}],"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":{"shortName":"CPANSec","orgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateUpdated":"2026-07-21T19:06:15.526Z"},"solutions":[{"lang":"en","value":"Upgrade to Data::Deque::Shared 0.06 or later, which creates the backing file mode 0600 (owner-only) with O_EXCL and O_NOFOLLOW."}],"source":{"discovery":"UNKNOWN"},"workarounds":[{"lang":"en","value":"For deployments that cannot upgrade to 0.06, 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"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"CHANGED","version":"3.1","baseScore":3.8,"attackVector":"LOCAL","baseSeverity":"LOW","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"LOW","confidentialityImpact":"LOW"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-07-23T12:39:21.699872Z","id":"CVE-2026-64614","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-23T12:40:40.462Z"}}]}}}