UBUNTU-CVE-2026-120455

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Source
https://ubuntu.com/security/CVE-2026-120455
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120455.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-120455
Upstream
Published
2026-11-03T00:00:00Z
Modified
2026-11-04T03:30:39Z
Severity
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H CVSS Calculator
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

rapidyaml through 0.16.0 contains an out-of-bounds write vulnerability in ParseEngine::_add_annotation() that allows attackers to corrupt memory by supplying YAML with excess anchors or tags. Attackers can submit YAML with consecutive anchors or tags to overflow the fixed two-element annotation array in release builds, corrupting stack memory and crashing the process.

References

Affected packages

Ubuntu:26.10 / rapidyaml

Package

Name
rapidyaml
Purl
pkg:deb/ubuntu/rapidyaml?arch=source&distro=stonking

Affected ranges

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

Affected versions

0.*
0.10.0+ds-1build1
0.11.1+ds-1
0.16.0+ds-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libryml0.16",
            "binary_version": "0.16.0+ds-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120455.json"

Ubuntu:26.04:LTS / rapidyaml

Package

Name
rapidyaml
Purl
pkg:deb/ubuntu/rapidyaml?arch=source&distro=resolute

Affected ranges

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

Affected versions

0.*
0.9.0+ds-3
0.10.0+ds-1
0.10.0+ds-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libryml0",
            "binary_version": "0.10.0+ds-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-120455.json"