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6 vulnerabilities found for msgpack-java by msgpack
CVE-2026-90473 (GCVE-0-2026-90473)
Vulnerability from nvd – Published: 2026-09-12 11:06 – Updated: 2026-09-12 11:06
VLAI
EPSS
VEX
Title
msgpack-java through 0.9.12 Integer Overflow via MAP32
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.
Severity
5.3 (Medium)
CWE
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/msgpack/msgpack-java/issues/1014 | issue-tracking |
| https://github.com/msgpack/msgpack-java/blob/v0.9… | technical-description |
| https://github.com/msgpack/msgpack-java | product |
| https://www.vulncheck.com/advisories/msgpack-java… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| msgpack | msgpack-java |
Affected:
0 , ≤ 0.9.12
(semver)
cpe:2.3:a:msgpack:messagepack:*:*:*:*:*:java:*:* |
Date Public
2026-08-07 00:00
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CVE-2026-90472 (GCVE-0-2026-90472)
Vulnerability from nvd – Published: 2026-09-12 11:06 – Updated: 2026-09-14 16:08
VLAI
EPSS
VEX
Title
msgpack-java through 0.9.12 Stack Overflow via Nested Arrays
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.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 16:06 UTC
CWE
- CWE-674 - Uncontrolled Recursion
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/msgpack/msgpack-java/issues/1015 | issue-tracking |
| https://github.com/msgpack/msgpack-java/blob/v0.9… | technical-description |
| https://github.com/msgpack/msgpack-java | product |
| https://www.vulncheck.com/advisories/msgpack-java… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| msgpack | msgpack-java |
Affected:
0 , ≤ 0.9.12
(semver)
cpe:2.3:a:msgpack:messagepack:*:*:*:*:*:java:*:* |
Date Public
2026-08-07 00:00
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CVE-2026-21452 (GCVE-0-2026-21452)
Vulnerability from nvd – Published: 2026-01-02 20:47 – Updated: 2026-01-02 21:22
VLAI
EPSS
VEX
Title
MessagePack-Java Vulnerable to Remote Denial of Service via Malicious .msgpack Model File Triggering Unbounded EXT Payload Allocation
Summary
MessagePack for Java is a serializer implementation for Java. A denial-of-service vulnerability exists in versions prior to 0.9.11 when deserializing .msgpack files containing EXT32 objects with attacker-controlled payload lengths. While MessagePack-Java parses extension headers lazily, it later trusts the declared EXT payload length when materializing the extension data. When ExtensionValue.getData() is invoked, the library attempts to allocate a byte array of the declared length without enforcing any upper bound. A malicious .msgpack file of only a few bytes can therefore trigger unbounded heap allocation, resulting in JVM heap exhaustion, process termination, or service unavailability. This vulnerability is triggered during model loading / deserialization, making it a model format vulnerability suitable for remote exploitation. The vulnerability enables a remote denial-of-service attack against applications that deserialize untrusted .msgpack model files using MessagePack for Java. A specially crafted but syntactically valid .msgpack file containing an EXT32 object with an attacker-controlled, excessively large payload length can trigger unbounded memory allocation during deserialization. When the model file is loaded, the library trusts the declared length metadata and attempts to allocate a byte array of that size, leading to rapid heap exhaustion, excessive garbage collection, or immediate JVM termination with an OutOfMemoryError. The attack requires no malformed bytes, user interaction, or elevated privileges and can be exploited remotely in real-world environments such as model registries, inference services, CI/CD pipelines, and cloud-based model hosting platforms that accept or fetch .msgpack artifacts. Because the malicious file is extremely small yet valid, it can bypass basic validation and scanning mechanisms, resulting in complete service unavailability and potential cascading failures in production systems. Version 0.9.11 fixes the vulnerability.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-02 21:21 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/msgpack/msgpack-java/security/… | x_refsource_CONFIRM |
| https://github.com/msgpack/msgpack-java/commit/da… | x_refsource_MISC |
| https://github.com/msgpack/msgpack-java/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| msgpack | msgpack-java |
Affected:
< 0.9.11
|
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CVE-2026-90473 (GCVE-0-2026-90473)
Vulnerability from cvelistv5 – Published: 2026-09-12 11:06 – Updated: 2026-09-12 11:06
VLAI
EPSS
VEX
Title
msgpack-java through 0.9.12 Integer Overflow via MAP32
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.
Severity
5.3 (Medium)
CWE
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/msgpack/msgpack-java/issues/1014 | issue-tracking |
| https://github.com/msgpack/msgpack-java/blob/v0.9… | technical-description |
| https://github.com/msgpack/msgpack-java | product |
| https://www.vulncheck.com/advisories/msgpack-java… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| msgpack | msgpack-java |
Affected:
0 , ≤ 0.9.12
(semver)
cpe:2.3:a:msgpack:messagepack:*:*:*:*:*:java:*:* |
Date Public
2026-08-07 00:00
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CVE-2026-90472 (GCVE-0-2026-90472)
Vulnerability from cvelistv5 – Published: 2026-09-12 11:06 – Updated: 2026-09-14 16:08
VLAI
EPSS
VEX
Title
msgpack-java through 0.9.12 Stack Overflow via Nested Arrays
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.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 16:06 UTC
CWE
- CWE-674 - Uncontrolled Recursion
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/msgpack/msgpack-java/issues/1015 | issue-tracking |
| https://github.com/msgpack/msgpack-java/blob/v0.9… | technical-description |
| https://github.com/msgpack/msgpack-java | product |
| https://www.vulncheck.com/advisories/msgpack-java… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| msgpack | msgpack-java |
Affected:
0 , ≤ 0.9.12
(semver)
cpe:2.3:a:msgpack:messagepack:*:*:*:*:*:java:*:* |
Date Public
2026-08-07 00:00
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CVE-2026-21452 (GCVE-0-2026-21452)
Vulnerability from cvelistv5 – Published: 2026-01-02 20:47 – Updated: 2026-01-02 21:22
VLAI
EPSS
VEX
Title
MessagePack-Java Vulnerable to Remote Denial of Service via Malicious .msgpack Model File Triggering Unbounded EXT Payload Allocation
Summary
MessagePack for Java is a serializer implementation for Java. A denial-of-service vulnerability exists in versions prior to 0.9.11 when deserializing .msgpack files containing EXT32 objects with attacker-controlled payload lengths. While MessagePack-Java parses extension headers lazily, it later trusts the declared EXT payload length when materializing the extension data. When ExtensionValue.getData() is invoked, the library attempts to allocate a byte array of the declared length without enforcing any upper bound. A malicious .msgpack file of only a few bytes can therefore trigger unbounded heap allocation, resulting in JVM heap exhaustion, process termination, or service unavailability. This vulnerability is triggered during model loading / deserialization, making it a model format vulnerability suitable for remote exploitation. The vulnerability enables a remote denial-of-service attack against applications that deserialize untrusted .msgpack model files using MessagePack for Java. A specially crafted but syntactically valid .msgpack file containing an EXT32 object with an attacker-controlled, excessively large payload length can trigger unbounded memory allocation during deserialization. When the model file is loaded, the library trusts the declared length metadata and attempts to allocate a byte array of that size, leading to rapid heap exhaustion, excessive garbage collection, or immediate JVM termination with an OutOfMemoryError. The attack requires no malformed bytes, user interaction, or elevated privileges and can be exploited remotely in real-world environments such as model registries, inference services, CI/CD pipelines, and cloud-based model hosting platforms that accept or fetch .msgpack artifacts. Because the malicious file is extremely small yet valid, it can bypass basic validation and scanning mechanisms, resulting in complete service unavailability and potential cascading failures in production systems. Version 0.9.11 fixes the vulnerability.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-02 21:21 UTC
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/msgpack/msgpack-java/security/… | x_refsource_CONFIRM |
| https://github.com/msgpack/msgpack-java/commit/da… | x_refsource_MISC |
| https://github.com/msgpack/msgpack-java/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| msgpack | msgpack-java |
Affected:
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