DEBIAN-CVE-2026-49263

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Source
https://security-tracker.debian.org/tracker/CVE-2026-49263
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49263.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-49263
Upstream
Published
2026-08-14T18:17:30Z
Modified
2026-09-19T22:47:47Z
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
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

Debian:12 / capstone

Package

Name
capstone
Purl
pkg:deb/debian/capstone?arch=source&distro=bookworm

Affected ranges

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

Affected versions

4.*
4.0.2-5
4.0.2-5.1
5.*
5.0-1~exp1
5.0.1-1~exp1
5.0.3-1
5.0.5-1
5.0.6-1
5.0.7-1~deb13u1
5.0.7-1
5.0.7-2
5.0.9-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49263.json"

Debian:13 / capstone

Package

Name
capstone
Purl
pkg:deb/debian/capstone?arch=source&distro=trixie

Affected ranges

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

Affected versions

5.*
5.0.6-1
5.0.7-1~deb13u1
5.0.7-1
5.0.7-2
5.0.9-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49263.json"

Debian:14 / capstone

Package

Name
capstone
Purl
pkg:deb/debian/capstone?arch=source&distro=forky

Affected ranges

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

Affected versions

5.*
5.0.6-1
5.0.7-1~deb13u1
5.0.7-1
5.0.7-2
5.0.9-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49263.json"