Cross-Buffer Data Vulnerability in MessagePack for Ruby
CVE-2026-54522

2.1LOW

Key Information:

Vendor

Msgpack

Status
Msgpack-ruby
Vendor
CVE Published:
30 July 2026

What is CVE-2026-54522?

MessagePack for Ruby, utilized for binary serialization, contains a vulnerability where the Buffer#clear method does not correctly manage internal memory states after returning a memory page to the shared pool. This oversight can lead to data corruption or unintended data disclosure between different Buffer instances. Affected users of versions earlier than 1.8.2 should promptly update to the latest version to mitigate the risk of exploitation.

Affected Version(s)

msgpack-ruby < 1.8.2

References

https://github.com/msgpack/msgpack-ruby/security/advisori...
x_refsource_CONFIRM
https://github.com/msgpack/msgpack-ruby/commit/5627d71606...
x_refsource_MISC

CVSS V4

Score:
2.1
Severity:
LOW
Confidentiality:
Low
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.