VDB
CVE-2026-57585
CVE-2026-57585
PUBLISHED
CVSS 7.5 HIGH
Reported by GitHub_M · Published June 30, 2026
MessagePack is the serializer implementation for Python msgpack.org. Prior to 1.2.1, there is an Out-of-bounds read/crash on Unpacker reuse after a caught error, potentially leading to a DoS attack. If the Unpacker is used repeatedly after an error occurs, the process may crash with a SEGV. This issue has been fixed in version 1.2.1.
Risk Scores
CVSS 3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| msgpack | msgpack-python | < 1.2.1 |
| msgpack | msgpack-python | < 1.2.1, < 1.2.1 |
Timeline
- Jun 19, 2026 CVE Published
- Jul 1, 2026 Coalition ESS Score
- Jul 1, 2026 Security Advisory
- Jul 1, 2026 CVE Updated
- Aug 7, 2026 EPSS Score
- Aug 24, 2026 EPSS Score
- Aug 26, 2026 EPSS Score
- Aug 30, 2026 EPSS Score
- Sep 3, 2026 EPSS Score
- Sep 6, 2026 EPSS Score