Bug#1148829: msgpack-java: CVE-2026-90473

[Salvatore Bonaccorso]

Source: msgpack-java
Version: 0.9.6-1
Severity: important
Tags: security upstream
Forwarded: https://github.com/msgpack/msgpack-java/issues/1014
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

*** /tmp/msgpack-java.reportbug
Package: msgpack-java
X-Debbugs-CC: team at security.debian.org
Severity: grave
Tags: security

Hi,

The following vulnerability was published for msgpack-java.

CVE-2026-90473[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-90473
    https://www.cve.org/CVERecord?id=CVE-2026-90473
[1] https://github.com/msgpack/msgpack-java/issues/1014

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore