CVE-2026-90472

msgpack-java through 0.9.12 Stack Overflow via Nested Arrays

6.9 Medium

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: Low

Exploit likelihood

0.57%Up 0.2 points since Sep 13, 2026

What each source reports

CVE List Score used 6.9

msgpack-java through 0.9.12 Stack Overflow via Nested Arrays

Record: CVE-2026-90472
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-674
Updated: 2026-11-02

EUVDEUVD-2026-76848 6.9

Record: EUVD-2026-76848
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-h5hr-vppv-v9cg 6.9

msgpack-java through 0.9.12 contains a stack overflow vulnerability in MessageUnpacker...

Record: GHSA-h5hr-vppv-v9cg
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-674
Updated: 2026-11-02

NVD 6.9

Record: CVE-2026-90472
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-674
Updated: 2026-11-02

OSV 6.9

msgpack-java through 0.9.12 Stack Overflow via Nested Arrays

Record: CVE-2026-90472
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Weakness: CWE-674
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-90472 6.9

Record: DEBIAN-CVE-2026-90472
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-90472 6.9

Record: UBUNTU-CVE-2026-90472
CVSS 4.0: 6.9 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS 3.1: 5.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-02

Affected products

msgpack msgpack-java

Affected packages

Affected packages
Package	Affected	Fixed
`msgpack-java` Debian:12	All versions, plus listed versions 0.9.3-10.9.4-10.9.5-10.9.6-1	None known
`msgpack-java` Debian:13	All versions, plus listed versions 0.9.6-1	None known
`msgpack-java` Debian:14	All versions, plus listed versions 0.9.6-1	None known
`msgpack-java` Ubuntu:20.04:LTS	All versions, plus listed versions 0.8.18-20.8.19-1	None known
`msgpack-java` Ubuntu:22.04:LTS	All versions, plus listed versions 0.8.22-20.9.0-10.9.0-2	None known
`msgpack-java` Ubuntu:24.04:LTS	All versions, plus listed versions 0.9.5-10.9.6-1	None known
`msgpack-java` Ubuntu:26.10	All versions, plus listed versions 0.9.6-1build1	None known
`msgpack-java` Ubuntu:26.04:LTS	All versions, plus listed versions 0.9.6-10.9.6-1build1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-90472 is a medium vulnerability (CVSS 6.9) in Msgpack Msgpack-java, published September 12, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.57%, the 47th percentile. No source names a fixed version.

References

Show 4 moreShow less