{"api_version":"1","generated_at":"2026-07-21T22:59:26+00:00","cve":"CVE-2026-64613","urls":{"html":"https://cve.report/CVE-2026-64613","api":"https://cve.report/api/cve/CVE-2026-64613.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64613","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64613"},"summary":{"title":"Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_NOFOLLOW","description":"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.","state":"PUBLISHED","assigner":"CPANSec","published_at":"2026-07-21 20:17:03","updated_at":"2026-07-21 20:17:03"},"problem_types":["CWE-59","CWE-732","CWE-732 CWE-732 Incorrect Permission Assignment for Critical Resource","CWE-59 CWE-59 Improper Link Resolution Before File Access"],"metrics":[],"references":[{"url":"https://metacpan.org/release/EGOR/Data-Buffer-Shared-0.05/changes","name":"https://metacpan.org/release/EGOR/Data-Buffer-Shared-0.05/changes","refsource":"9b29abf9-4ab0-4765-b253-1875cd9b441e","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://metacpan.org/release/EGOR/Data-Buffer-Shared-0.05/diff/EGOR/Data-Buffer-Shared-0.04#buf_generic.h","name":"https://metacpan.org/release/EGOR/Data-Buffer-Shared-0.05/diff/EGOR/Data-Buffer-Shared-0.04#buf_generic.h","refsource":"9b29abf9-4ab0-4765-b253-1875cd9b441e","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64613","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64613","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"EGOR","product":"Data::Buffer::Shared","version":"affected 0.05 custom","platforms":[]}],"timeline":[],"solutions":[{"source":"CNA","title":"","value":"Upgrade to Data::Buffer::Shared 0.05 or later, which creates the backing file mode 0600 (owner-only) with O_NOFOLLOW.","time":"","lang":"en"}],"workarounds":[{"source":"CNA","title":"","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.","time":"","lang":"en"}],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"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":{"dateUpdated":"2026-07-21T19:05:49.579Z","orgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","shortName":"CPANSec"},"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"}}},"cveMetadata":{"assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","assignerShortName":"CPANSec","cveId":"CVE-2026-64613","datePublished":"2026-07-21T19:05:49.579Z","dateReserved":"2026-07-20T11:30:10.287Z","dateUpdated":"2026-07-21T19:05:49.579Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-21 20:17:03","lastModifiedDate":"2026-07-21 20:17:03","problem_types":["CWE-59","CWE-732","CWE-732 CWE-732 Incorrect Permission Assignment for Critical Resource","CWE-59 CWE-59 Improper Link Resolution Before File Access"],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64613","Ordinal":"1","Title":"Data::Buffer::Shared versions before 0.05 for Perl create a worl","CVE":"CVE-2026-64613","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64613","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Data::Buffer::Shared versions before 0.05 for Perl create a worl"}]}}}