CVE-2026-54522— MessagePack::Buffer#clear Use-After-Free that Enables Cross-Buffer Disclosure
Possible ATT&CK Techniques 1AI
T1560.001 · Archive via UtilityAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| msgpack | msgpack-ruby | < 1.8.2 | affected |
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I. Basic Information for CVE-2026-54522
Vulnerability Information
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Vulnerability Title
MessagePack::Buffer#clear Use-After-Free that Enables Cross-Buffer Disclosure
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
释放后使用
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| msgpack | msgpack-ruby | < 1.8.2 | - |
II. Public POCs for CVE-2026-54522
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-54522 (1)
Vendor Advisories for CVE-2026-54522 (1)
IV. Related Vulnerabilities
V. Comments for CVE-2026-54522
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