bootsnap-1.4.4.gem: 1 vulnerabilities (highest severity is: 4.0)

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Vulnerable Library - bootsnap-1.4.4.gem

Path to dependency file: /Gemfile.lock

Path to vulnerable library: /tmp/containerbase/cache/.ruby/cache/msgpack-1.3.0.gem

Found in HEAD commit: 84d8c4c8d5cfac4705d302f9b44c063177f8ae86

Vulnerabilities

Vulnerability	Severity	CVSS	Exploit Maturity	EPSS	Dependency	Type	Fixed in (bootsnap version)	Remediation Possible**	Reachability
CVE-2026-54522	Medium	4.0	Not Defined		msgpack-1.3.0.gem	Transitive	N/A*	❌

*For some transitive vulnerabilities, there is no version of direct dependency with a fix. Check the "Details" section below to see if there is a version of transitive dependency where vulnerability is fixed.

**In some cases, Remediation PR cannot be created automatically for a vulnerability despite the availability of remediation

Details

CVE-2026-54522

Vulnerable Library - msgpack-1.3.0.gem

MessagePack is a binary-based efficient object serialization library. It enables to exchange structured objects between many languages like JSON. But unlike JSON, it is very fast and small.

Library home page: https://rubygems.org/gems/msgpack-1.3.0.gem

Path to dependency file: /Gemfile.lock

Path to vulnerable library: /tmp/containerbase/cache/.ruby/cache/msgpack-1.3.0.gem

Dependency Hierarchy:

• bootsnap-1.4.4.gem (Root Library)
  • ❌ msgpack-1.3.0.gem (Vulnerable Library)

Found in HEAD commit: 84d8c4c8d5cfac4705d302f9b44c063177f8ae86

Found in base branch: main

Vulnerability Details

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.

Publish Date: 2026-07-30

URL: CVE-2026-54522

Threat Assessment

Exploit Maturity: Not Defined

EPSS:

CVSS 3 Score Details (4.0)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Local
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: Low
  • Integrity Impact: None
  • Availability Impact: None

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-4mrv-5p47-p938

Release Date: 2026-07-30

Fix Resolution: msgpack - 1.8.2