UBUNTU-CVE-2026-54522

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Source
https://ubuntu.com/security/CVE-2026-54522
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54522.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-54522
Upstream
Published
2026-07-30T17:16:00Z
Modified
2026-08-06T03:10:20.818807201Z
Severity
  • 2.1 (Low) CVSS_V4 - 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 CVSS Calculator
  • Ubuntu - medium
Summary
[none]
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 rmemlast, rmemend, and rmemowner stale after msgpackbuffershift_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.

References

Affected packages

Ubuntu:16.04:LTS
ruby-msgpack

Package

Name
ruby-msgpack
Purl
pkg:deb/ubuntu/ruby-msgpack?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.6.2-1build1
0.6.2-1build2
0.6.2-1build3
0.6.2-1build4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-msgpack",
            "binary_version": "0.6.2-1build4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54522.json"
Ubuntu:18.04:LTS
ruby-msgpack

Package

Name
ruby-msgpack
Purl
pkg:deb/ubuntu/ruby-msgpack?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.0.0-1
1.1.0-1
1.1.0-1build1
1.1.0-1build2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-msgpack",
            "binary_version": "1.1.0-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54522.json"
Ubuntu:20.04:LTS
ruby-msgpack

Package

Name
ruby-msgpack
Purl
pkg:deb/ubuntu/ruby-msgpack?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.1.0-1build2
1.1.0-1build3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-msgpack",
            "binary_version": "1.1.0-1build3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54522.json"
Ubuntu:22.04:LTS
ruby-msgpack

Package

Name
ruby-msgpack
Purl
pkg:deb/ubuntu/ruby-msgpack?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.1.0-2build1
1.1.0-2build2
1.4.2-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-msgpack",
            "binary_version": "1.4.2-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54522.json"
Ubuntu:24.04:LTS
ruby-msgpack

Package

Name
ruby-msgpack
Purl
pkg:deb/ubuntu/ruby-msgpack?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.4.2-2build2
1.4.2-2build3
1.4.2-2build4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-msgpack",
            "binary_version": "1.4.2-2build4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54522.json"
Ubuntu:26.04:LTS
ruby-msgpack

Package

Name
ruby-msgpack
Purl
pkg:deb/ubuntu/ruby-msgpack?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

1.*
1.7.2-1.1
1.8.0-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "ruby-msgpack",
            "binary_version": "1.8.0-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54522.json"