DEBIAN-CVE-2026-55893

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Source
https://security-tracker.debian.org/tracker/CVE-2026-55893
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55893.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-55893
Upstream
Published
2026-08-20T22:17:22.787Z
Modified
2026-08-22T08:47:38.000780055Z
Severity
  • 7.3 (High) CVSS_V4 - CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/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. In 6.0.0-Alpha9 and earlier, Capstone's arch/SH/SHDisassembler.c SH floating-point decoders such as opFADD, opFMUL, and opFSUB call setreg() and setregn() using shinfo.op.opcount without checking the fixed-size operands[] array. Repeated crafted instructions processed through csdisasmiter() or csdisasm() with CSARCHSH, CSMODESH2A or CSMODESH4A, CSMODESHFPU, and CSOPTDETAIL can increment the operand count beyond the 176-byte sh_info allocation and perform a four-byte heap buffer overflow write. The corruption can crash the process and may enable code execution depending on heap layout. This issue is fixed in version 6.0.0-Alpha10.

References

Affected packages

Debian:11 / capstone

Package

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

Affected ranges

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

Affected versions

4.*
4.0.2-3
4.0.2-4
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-2026-55893.json"

Debian:12 / capstone

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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-2026-55893.json"

Debian:13 / capstone

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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-2026-55893.json"

Debian:14 / capstone

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown 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-2026-55893.json"