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NVD / CVE Program· CNA GitHub_M

CVE-2026-47143: Capstone has a NULL Pointer Dereference with 3DNow! opcodes

MediumCVSS 5.9 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 23/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.46% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: azl3 rust 1.90.0-10 on Azure Linux 3.0 1.90.0-10; azl3 rust 1.90.0-9 on Azure Linux 3.0 1.90.0-10.

Low priority for now. Upgrade to azl3 rust 1.90.0-10 on Azure Linux 3.0 1.90.0-10; azl3 rust 1.90.0-9 on Azure Linux 3.0 1.90.0-10 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Jul 21, 2026
Updated
Oct 24, 2026
EPSS
0.4% · 40th percentile

Report tools

JSON

Action score

23

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.9
CNA · GitHub_M
5.1
0.8 point gap

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-47143

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
capstone-enginecapstone

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • capstone-engine capstone

    • < 5.0.8, < 6.0.0-Alpha8affected

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • capstone-engine capstonebefore 5.0.8
  • capstone-engine capstone6.0.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.23capstonebefore 5.0.8-r05.0.8-r0
Debian:12capstonefrom 0—
Debian:14capstonebefore 5.0.9-15.0.9-1
PyPIcapstonebefore 5.0.85.0.8
Red Hat:hummingbird:1capstonebefore 0:5.0.8-0.1.hum10:5.0.8-0.1.hum1
Red Hat:hummingbird:1capstone-develbefore 0:5.0.8-0.1.hum10:5.0.8-0.1.hum1
Red Hat:hummingbird:1capstone-javabefore 0:5.0.8-0.1.hum10:5.0.8-0.1.hum1
Red Hat:hummingbird:1capstone-staticbefore 0:5.0.8-0.1.hum10:5.0.8-0.1.hum1
Red Hat:hummingbird:1python3-capstonebefore 0:5.0.8-0.1.hum10:5.0.8-0.1.hum1

Same product

capstone-engine: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-68114Capstone doesn't check vsnprintf return in SStream_concat, allows stack buffer underflow and overflow
    39Monitor
  • CVE-2017-6952Integer overflow in the cs_winkernel_malloc function in winkernel_mm.c in Capstone 3.0.4 and earlier allows attackers to cause a denial of…
    35Monitor
  • CVE-2025-67873Capstone doesn't check Skipdata length, leading to cs_insn.bytes heap buffer overflow
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2016-7151May 15, 2019 · Capstone 3.0.4 has an out-of-bounds vulnerability (SEGV caused by a read memory access) in X86_insn_reg_intel in arch/X86/X86Mapping.c.
    22Monitor
  • Later →CVE-2026-49263Aug 14, 2026 · Capstone WASM `br_table` instruction-size truncation can cause no-progress disassembly and parser desynchronization
    8Monitor
  • Later →CVE-2026-49282Aug 14, 2026 · Capstone M68K and RISCV `cs_insn_name()` invalid IDs can trigger out-of-bounds reads and process crashes
    20Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 rust 1.90.0-10 on Azure Linux 3.01.90.0-10 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 rust 1.90.0-9 on Azure Linux 3.01.90.0-10 · CBL-Mariner ReleasesMicrosoft (MSRC)
alpine:capstone5.0.8-r0 · Alpine:v3.23Package registry (OSV)
debian:capstone5.0.9-1 · Debian:14Package registry (OSV)
PyPI:capstone5.0.8Package registry (OSV)
red hat:capstone0:5.0.8-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:capstone-devel0:5.0.8-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:capstone-java0:5.0.8-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:capstone-static0:5.0.8-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3-capstone0:5.0.8-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Not on record for this CVE: researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records