UBUNTU-CVE-2026-57077

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Source
https://ubuntu.com/security/CVE-2026-57077
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-57077.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-57077
Upstream
Published
2026-07-16T22:17:00Z
Modified
2026-07-29T07:59:16Z
Severity
  • 7.7 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

YAML::Syck versions before 1.47 for Perl allow an out-of-bounds read via an unbounded newline scan in newline_len. In the bundled libsyck newline_len and is_newline dereference the scan pointer, and the following byte for a "\r\n" pair, with no NUL-terminator or bounds check. During block-scalar lexing at a document boundary the scan runs one byte past the heap lexer buffer. This is an incomplete fix of CVE-2025-11683, on a lexer path the earlier fix did not cover. Any caller that runs Load or LoadFile on an untrusted document with a block scalar at a document boundary reaches the over-read.

References

Affected packages

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
0 Unknown 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-2026-57077.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
0 Unknown 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-2026-57077.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
0 Unknown 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-2026-57077.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
0 Unknown 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-2026-57077.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
0 Unknown 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-2026-57077.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
0 Unknown 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-2026-57077.json"