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TI-2026-61499 Aliases CVE-2026-90472GHSA-h5hr-vppv-v9cg

msgpack-java through 0.9.12 Stack Overflow via Nested Arrays

Priority HIGH 70CWE-674Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Will not fix Red Hat: no fix planned

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-674.

Summary

msgpack-java through 0.9.12 contains a stack overflow vulnerability in MessageUnpacker.unpackValue() that recursively deserializes arrays and maps without nesting depth limits. Attackers can craft payloads with deeply nested arrays to exhaust the deserializing thread's stack and trigger StackOverflowError, causing per-request deserialization failures.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00566 47th percentileScored 2026-11-07
Fix Will not fix Red Hat: no fix planned

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
msgpackmsgpack-javaup to 0.9.12—No fix listedCNA
  • msgpack-java Vendormsgpack Affected up to 0.9.12 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Fuse 7AffectedNo fix planned: Out of support scope

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-90472
  2. 2026-10-03 Alias added: GHSA-h5hr-vppv-v9cg
  3. 2026-11-06 Affected versions changed · Red Hat
  4. 2026-11-06 CVSS score added · Red Hat

References

Other 3

  • TI-2026-17336 Uncontrolled resource consumption in msgpack-java CVSS 3.1HIGH 7.5
  • TI-2026-51079 msgpack-c Integer Overflow in msgpack_unpacker_expand_buffer Causes a False-Success Undersized Reservation CVSS 4.0MEDIUM 5.8
  • TI-2026-39368 MessagePack::Buffer#clear Use-After-Free that Enables Cross-Buffer Disclosure CVSS 4.0LOW 2.1
  • TI-2026-79420 Memory leak in MessagePack C extension when map key validation fails CVSS 3.1HIGH 7.5
  • TI-2026-41435 MessagePack: Out-of-bounds read/crash on Unpacker reuse after caught error CVSS 3.1HIGH 7.5
  • TI-2026-61500 msgpack-java through 0.9.12 Integer Overflow via MAP32 CVSS 4.0MEDIUM 6.9

Sources

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