# CVE-2026-118447: Uninitialized INSTRUX contents returned after decoding failure in pybddisasm

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

A use of uninitialized memory vulnerability in the pybddisasm Python bindings may disclose process memory when instruction decoding fails. The nd_decode, nd_decode_ex, nd_decode_ex2, and nd_decode_with_context functions may return an INSTRUX object whose contents have not been initialized after an unsuccessful decoding operation, including failures caused by invalid parameters. Accessing members of the returned object may expose residual process memory. Exploitation requires an application to access and expose the returned object contents after a decoding failure. The pybddisasm package is no longer maintained.

## Remediation

- fix: Discontinue use of the unmaintained pybddisasm package. No fixed release will become available. (source: CNA: Bitdefender)

## Affected products and versions

- Bitdefender / pybddisasm (pybddisasm): ≥ 0; ≤ 0.3.0 (affected, python). Source: CNA: Bitdefender

## Severity and prioritization

- CVSS 4.0: 4.8 (medium); CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N; source: CNA: Bitdefender

- CVSS 4.0: 4.8 (medium); CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/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; source: NVD: cve-requests@bitdefender.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-457

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://pypi.org/project/pybddisasm/ (CNA: Bitdefender)

- https://pypi.org/project/pybddisasm/ (cve-requests@bitdefender.com)

## Provenance

- CNA: Bitdefender: https://www.cve.org/CVERecord?id=CVE-2026-118447; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-118447; retrieved 2026-11-03; source updated 2026-11-03

Revision: 441b022c0482457d7f0aad9c7a49e9e4a53288a14e103147f5f619d536bbadce

Canonical: https://y2.dev/cve/CVE-2026-118447

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