UBUNTU-CVE-2026-49263

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Source
https://ubuntu.com/security/CVE-2026-49263
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49263.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-49263
Upstream
Published
2026-08-14T18:17:00Z
Modified
2026-08-19T11:05:28Z
Severity
  • 2.0 (Low) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Capstone is a disassembly framework. Prior to version 6.0.0-Alpha9, Capstone's WebAssembly backend accepts attacker-controlled raw WASM instruction bytes through the public cs_disasm() and cs_disasm_iter() APIs. For a large but well-formed br_table instruction, the WASM decoder accumulates the immediate length in a wider local variable but returns it through a uint16_t instruction-size path. When the encoded instruction length is exactly 65,536 bytes, the size wraps to zero and cs_disasm() can repeatedly decode the same instruction without advancing. For larger lengths, cs_disasm_iter() advances into the middle of the br_table payload and decodes target bytes as subsequent instructions. This is an availability and parser-integrity issue. Version 6.0.0-Alpha9 patches the issue.

References

Affected packages

Ubuntu:16.04:LTS
capstone

Package

Name
capstone
Purl
pkg:deb/ubuntu/capstone?arch=source&distro=xenial

Affected ranges

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

Affected versions

3.*
3.0.4-0.1
3.0.4-0.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libcapstone3",
            "binary_version": "3.0.4-0.2"
        },
        {
            "binary_name": "python-capstone",
            "binary_version": "3.0.4-0.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49263.json"
Ubuntu:18.04:LTS
capstone

Package

Name
capstone
Purl
pkg:deb/ubuntu/capstone?arch=source&distro=bionic

Affected ranges

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

Affected versions

3.*
3.0.4-3
3.0.4-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libcapstone3",
            "binary_version": "3.0.4-5"
        },
        {
            "binary_name": "python-capstone",
            "binary_version": "3.0.4-5"
        },
        {
            "binary_name": "python3-capstone",
            "binary_version": "3.0.4-5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49263.json"
Ubuntu:20.04:LTS
capstone

Package

Name
capstone
Purl
pkg:deb/ubuntu/capstone?arch=source&distro=focal

Affected ranges

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

Affected versions

4.*
4.0.1+really+3.0.5-1
4.0.1+really+3.0.5-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "capstone-tool",
            "binary_version": "4.0.1+really+3.0.5-1build1"
        },
        {
            "binary_name": "libcapstone3",
            "binary_version": "4.0.1+really+3.0.5-1build1"
        },
        {
            "binary_name": "python-capstone",
            "binary_version": "4.0.1+really+3.0.5-1build1"
        },
        {
            "binary_name": "python3-capstone",
            "binary_version": "4.0.1+really+3.0.5-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49263.json"
Ubuntu:22.04:LTS
capstone

Package

Name
capstone
Purl
pkg:deb/ubuntu/capstone?arch=source&distro=jammy

Affected ranges

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

Affected versions

4.*
4.0.2-3
4.0.2-3build1
4.0.2-5

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "capstone-tool",
            "binary_version": "4.0.2-5"
        },
        {
            "binary_name": "libcapstone4",
            "binary_version": "4.0.2-5"
        },
        {
            "binary_name": "python3-capstone",
            "binary_version": "4.0.2-5"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49263.json"
Ubuntu:24.04:LTS
capstone

Package

Name
capstone
Purl
pkg:deb/ubuntu/capstone?arch=source&distro=noble

Affected ranges

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

Affected versions

4.*
4.0.2-5
4.0.2-5ubuntu1
4.0.2-5.1
4.0.2-5.1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "capstone-tool",
            "binary_version": "4.0.2-5.1build1"
        },
        {
            "binary_name": "libcapstone4",
            "binary_version": "4.0.2-5.1build1"
        },
        {
            "binary_name": "python3-capstone",
            "binary_version": "4.0.2-5.1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49263.json"
Ubuntu:26.04:LTS
capstone

Package

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

Affected ranges

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

Affected versions

5.*
5.0.6-1
5.0.6-1build1
5.0.7-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "capstone-tool",
            "binary_version": "5.0.7-2"
        },
        {
            "binary_name": "libcapstone5",
            "binary_version": "5.0.7-2"
        },
        {
            "binary_name": "python3-capstone",
            "binary_version": "5.0.7-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-49263.json"