PYSEC-2026-3544

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/capstone/PYSEC-2026-3544.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-3544
Aliases
Published
2026-07-21T21:16:50.270Z
Modified
2026-07-31T10:30:18.554773099Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

Capstone is a disassembly framework. Versions prior to 6.0.0-Alpha8 and 5.0.8 have a NULL pointer dereference in modRMRequired() and decode() when disassembling 3DNow! opcodes (0F 0F) in builds compiled with -DCAPSTONE_X86_REDUCE, allowing a remote attacker to crash any application using the reduced X86 Capstone library by supplying a crafted input containing the 4-byte sequence 0F 0F <modrm> <imm8>. Versions 6.0.0-Alpha8 and 5.0.8 patch the issue.

References

Affected packages

PyPI / capstone

Package

Name
capstone
View open source insights on deps.dev
Purl
pkg:pypi/capstone

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.0.8

Affected versions

2.*
2.0
2.1
3.*
3.0
3.0.1
3.0.2
3.0.3
3.0.4
3.0.5rc2
3.0.5
3.0.5.post1
4.*
4.0.0
4.0.1
4.0.2
5.*
5.0.0rc2
5.0.0rc4
5.0.0
5.0.0.post1
5.0.1
5.0.2
5.0.3
5.0.4
5.0.5
5.0.6
5.0.7

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/capstone/PYSEC-2026-3544.yaml"