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TI-2026-81997 Aliases CVE-2026-106972GHSA-hw75-hpgq-ph8x

Uncontrolled recursion in rybakit/msgpack allows denial of service

Priority HIGH 72CWE-674Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-674.

Summary

rybakit/msgpack versions prior to 0.11.0 contain uncontrolled recursion (CWE-674) in MessagePack\BufferUnpacker::unpack(). An unauthenticated remote attacker can exhaust memory and cause a denial of service by sending deeply nested input to an application that decodes it with this function.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Uncontrolled recursion in MessagePack\BufferUnpacker::unpack() in rybakit/msgpack versions prior to 0.11.0 allows attackers to cause a denial of service through memory exhaustion when an application decodes deeply nested, attacker-controlled MessagePack input.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00339 27th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
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
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

Remediation

Upgrade rybakit/msgpack to version 0.11.0 or later, which fixes this issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-28 Threatist record created from CVE-2026-106972
  2. 2026-10-28 Alias added: GHSA-hw75-hpgq-ph8x
  3. 2026-10-29 Title updated · CNA
  4. 2026-10-30 CVSS score added · CISA ADP
  5. 2026-10-30 Weakness changed · CISA ADP
  6. 2026-10-30 CISA SSVC decision points changed
  7. 2026-10-30 Priority changed: LOW → HIGH
  8. 2026-11-06 Affected versions changed · Red Hat
  9. 2026-11-06 CVSS score added · Red Hat

References

Other 3

Sources

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