Answer in brief
CVE-2026-90473 records a Medium severity (CVSS 6.9) vulnerability in msgpack-java through 0.9.12 Integer Overflow via MAP32. The current sources do not mark it as known exploited. The current feed maps msgpack/msgpack-java (generic), msgpack/msgpack-java (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps msgpack/msgpack-java (generic), msgpack/msgpack-java (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| msgpack/msgpack-javageneric | 0 | Not reported |
| msgpack/msgpack-javageneric | >=0 <=0.9.12 | Not reported |
Published upstream
Sep 12, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 12, 2026
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.
Quoted source text, attributed separately from HOL analysis.