UBUNTU-CVE-2026-5089

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Source
https://ubuntu.com/security/CVE-2026-5089
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5089.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-5089
Upstream
  • CVE-2026-5089
Published
2026-05-12T17:16:00Z
Modified
2026-05-20T22:03:09.574347137Z
Severity
  • 7.3 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

YAML::Syck versions before 1.38 for Perl has an out-of-bounds read. The base60 (sexagesimal) parsing code in perl_syck.h has a buffer underflow bug in both int#base60 and float#base60 handlers. When processing the leftmost segment of a colon-separated value (e.g., the 1 in 1:30:45), the inner while loop can decrement a pointer past the start of the string buffer: while ( colon >= ptr && *colon != ':' ) { colon--; } if ( *colon == ':' ) *colon = '\0'; // colon may be ptr-1 here When no colon is found (final/leftmost segment), colon becomes ptr-1, and the subsequent *colon dereference reads one byte before the allocated buffer.

References

Affected packages

Ubuntu:25.10
libyaml-syck-perl

Package

Name
libyaml-syck-perl
Purl
pkg:deb/ubuntu/libyaml-syck-perl?arch=source&distro=questing

Affected ranges

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

Affected versions

1.*
1.34-2build4
1.34-3
1.34-3ubuntu0.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libyaml-syck-perl",
            "binary_version": "1.34-3ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5089.json"
Ubuntu:26.04:LTS
libyaml-syck-perl

Package

Name
libyaml-syck-perl
Purl
pkg:deb/ubuntu/libyaml-syck-perl?arch=source&distro=resolute

Affected ranges

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

Affected versions

1.*
1.34-3
1.34-4
1.36-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libyaml-syck-perl",
            "binary_version": "1.36-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5089.json"
Ubuntu:Pro:16.04:LTS
libyaml-syck-perl

Package

Name
libyaml-syck-perl
Purl
pkg:deb/ubuntu/libyaml-syck-perl?arch=source&distro=esm-apps%2Fxenial

Affected ranges

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

Affected versions

1.*
1.27-2build2
1.29-1
1.29-1build1
1.29-1ubuntu0.16.04.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libyaml-syck-perl",
            "binary_version": "1.29-1ubuntu0.16.04.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5089.json"
Ubuntu:Pro:18.04:LTS
libyaml-syck-perl

Package

Name
libyaml-syck-perl
Purl
pkg:deb/ubuntu/libyaml-syck-perl?arch=source&distro=esm-apps%2Fbionic

Affected ranges

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

Affected versions

1.*
1.29-1build3
1.29-1ubuntu0.18.04.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libyaml-syck-perl",
            "binary_version": "1.29-1ubuntu0.18.04.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5089.json"
Ubuntu:Pro:20.04:LTS
libyaml-syck-perl

Package

Name
libyaml-syck-perl
Purl
pkg:deb/ubuntu/libyaml-syck-perl?arch=source&distro=esm-apps%2Ffocal

Affected ranges

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

Affected versions

1.*
1.31-1
1.31-1build1
1.31-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libyaml-syck-perl",
            "binary_version": "1.31-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5089.json"
Ubuntu:Pro:22.04:LTS
libyaml-syck-perl

Package

Name
libyaml-syck-perl
Purl
pkg:deb/ubuntu/libyaml-syck-perl?arch=source&distro=esm-apps%2Fjammy

Affected ranges

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

Affected versions

1.*
1.34-1build1
1.34-1build2
1.34-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libyaml-syck-perl",
            "binary_version": "1.34-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5089.json"
Ubuntu:Pro:24.04:LTS
libyaml-syck-perl

Package

Name
libyaml-syck-perl
Purl
pkg:deb/ubuntu/libyaml-syck-perl?arch=source&distro=esm-apps%2Fnoble

Affected ranges

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

Affected versions

1.*
1.34-2
1.34-2build1
1.34-2build2
1.34-2build3
1.34-2ubuntu0.24.04.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libyaml-syck-perl",
            "binary_version": "1.34-2ubuntu0.24.04.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5089.json"