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CVE-2026-90473

msgpack-java through 0.9.12 Integer Overflow via MAP32

CVSS 4.0 6.9 MEDIUMCVSS 3.1 5.3 MEDIUMCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-90473

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-90473

Published

msgpack-java

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "msgpack",
                    "product": "msgpack-java",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "0",
                            "lessThanOrEqual": "0.9.12",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "packageURL": "pkg:maven/org.msgpack/msgpack-core"
                }

Original source record · Cite this exact observation · Complete original publisher JSON