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TI-2026-61500 Aliases CVE-2026-90473GHSA-9vjp-f3jg-99pq

msgpack-java through 0.9.12 Integer Overflow via MAP32

Priority LOW 37CWE-190Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

msgpack-java through 0.9.12 contains an integer overflow vulnerability in MessageUnpacker.skipValue() when processing MAP32 containers with large element counts. Attackers can supply a MAP32 element count at or above 0x40000000 that wraps when doubled, causing the parser cursor to desynchronize and attacker-controlled data to be returned in place of later fields.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00412 35th percentileScored 2026-11-07
Fix Will not fix Red Hat: no fix planned

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
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-2026-90473
  2. 2026-10-03 Alias added: GHSA-9vjp-f3jg-99pq
  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-2026-61499 msgpack-java through 0.9.12 Stack Overflow via Nested Arrays CVSS 4.0MEDIUM 6.9
  • 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

Sources

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