Dashboard / CVE-2026-54522

CVE-2026-54522

LOW
INFO Priority: 0.00 BB Relevance: 39/100
Published: 2026-07-30 Modified: 2026-10-23 First seen: 2026-10-29 Status: active

Attack Surface

Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Local
AC: Low
PR: None
UI: None
S: X
AT: Present
VC: Low
VI: None
VA: None

Description

MessagePack for Ruby is an implementation of the MessagePack binary serialization format. Prior to 1.8.2, MessagePack::Buffer#clear in ext/msgpack/buffer.c leaves rmem_last, rmem_end, and rmem_owner stale after _msgpack_buffer_shift_chunk returns an rmem page to the shared pool, allowing a subsequent Buffer#write and a second MessagePack::Buffer to alias the page and disclose or corrupt cross-buffer data. This issue is fixed in version 1.8.2.

Weakness Classification (1)

Affected Software (1)

VendorProductVersion
msgpack messagepack < 1.8.2

References & Advisories (2)

Bug Bounty Relevance

39 / 100
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

2.1 / 10.0 v4.0
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.23%
Raw Score 0.002270
Percentile 13.4%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00227
2026-10-28
0.00227

Intelligence Sources

nvd ref →

External Links