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TI-2026-46175 Aliases CVE-2026-64613GHSA-pmmg-wc48-vjhq

Link following in EGOR Data::Buffer::Shared

Priority LOW 27CWE-59Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-59 and the CVSS impact.

Summary

Data::Buffer::Shared versions before 0.05 for Perl create a world-readable mmap backing file and open it without O_NOFOLLOW. The 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. 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 symlink at the path redirects the open to another file.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00176 7th percentileScored 2026-11-07
Fix Fixed Data::Buffer::Shared (EGOR): 0.05

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
EGORData::Buffer::Sharedbefore 0.050.05Patch availableCNA
  • Data::Buffer::Shared VendorEGOR Affected before 0.05 Fixed in 0.05 Patch available CNA

Remediation

  • Fix · CNA Data::Buffer::Shared (EGOR) Fixed in 0.05

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-64613
  2. 2026-10-03 Alias added: GHSA-pmmg-wc48-vjhq

References

Other 2

  • TI-2026-42314 Out-of-bounds read in EGOR Data::DisjointSet::Shared CVSS 3.1CRITICAL 9.8
  • TI-2026-42311 Stack-based buffer overflow in EGOR Data::RingBuffer::Shared CVSS 3.1CRITICAL 9.8
  • TI-2026-42312 Out-of-bounds read in EGOR Data::Intern::Shared CVSS 3.1CRITICAL 9.1
  • TI-2026-42309 Out-of-bounds read in EGOR Data::HashMap::Shared CVSS 3.1CRITICAL 9.1
  • TI-2026-42308 Out-of-bounds read in EGOR Data::RadixTree::Shared CVSS 3.1CRITICAL 9.1
  • TI-2026-42307 Out-of-bounds read in EGOR Data::SortedSet::Shared CVSS 3.1CRITICAL 9.1
See all 22 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences