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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64617
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-21 20:17:04 UTC
Updated2026-07-23 13:16:31 UTC
DescriptionData::PubSub::Shared versions before 0.07 for Perl create a world-readable mmap backing file and open it without O_EXCL or O_NOFOLLOW. The 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. A "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.

Risk And Classification

Primary CVSS: v3.1 3.8 LOW from ADP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

EPSS: 0.001610000 probability, percentile 0.056780000 (date 2026-07-23)

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

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED3.8LOWCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary3.8LOWCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA EGOR DataPubSubShared affected 0.07 custom Not specified

References

ReferenceSourceLinkTags
metacpan.org/release/EGOR/Data-PubSub-Shared-0.07/diff/EGOR/Data-PubSub-Sh... 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
metacpan.org/release/EGOR/Data-PubSub-Shared-0.07/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to Data::PubSub::Shared 0.07 or later, which creates the backing file mode 0600 (owner-only) with O_EXCL and O_NOFOLLOW.

Workarounds

CNA: 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.

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