CVE-2026-90473
msgpack-java through 0.9.12 Integer Overflow via MAP32
- State
- Published
- Severity
- 6.9 Medium
- Published
- Sep 12, 2026
- Updated
- Sep 24, 2026
- Reserved
- Sep 12, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N | VulnCheck |
Weaknesses
- CWE-190 Integer Overflow or Wraparound
Affected Products
| Product | Versions |
|---|---|
msgpack-javamsgpack |
|
References
- GitHub Issue #1014issue-tracking
- MessageUnpacker.skipValue() ARRAY32/MAP32 length handling at v0.9.12technical-description
- https://github.com/msgpack/msgpack-javaproduct
- VulnCheck Advisory: msgpack-java through 0.9.12 Integer Overflow via MAP32third-party-advisory
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