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6.3

pybddisasm may expose nearby memory when decoding code

CVE-2026-118444 · published 2 days ago
Summary

The Python library pybddisasm can read past the end of a data buffer when decoding machine instructions, potentially revealing other information stored in the same process. This happens if a program calls certain decode functions with a buffer that is smaller than the length it reports. Update or replace the library, and ensure any code that uses these functions validates buffer sizes before calling them.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
Ecosystem VendorProductAffected versions
– bitdefender pybddisasm <= 0.3.0
Ubuntu:Pro:14.04:LTS canonical python2.7 All versions
Ubuntu:Pro:14.04:LTS canonical python3.4 All versions
Ubuntu:Pro:14.04:LTS canonical python3.5 All versions
Ubuntu:Pro:18.04:LTS canonical python3.6 All versions
Ubuntu:Pro:18.04:LTS canonical python3.7 All versions
Ubuntu:Pro:18.04:LTS canonical python3.8 All versions
Ubuntu:Pro:20.04:LTS canonical python3.9 All versions
Ubuntu:22.04:LTS canonical python3.10 All versions
Ubuntu:Pro:22.04:LTS canonical python3.11 All versions
Ubuntu:24.04:LTS canonical python3.12 All versions
Ubuntu:26.10 canonical python3.14 All versions
Original advisory text
Out-of-bounds reads during instruction decoding in pybddisasm
Out-of-bounds read vulnerabilities in the pybddisasm Python bindings may disclose adjacent process memory during instruction decoding. The nd_decode function may read up to 15 bytes without checking the actual length of the supplied Python buffer. The nd_decode_ex, nd_decode_ex2, and nd_decode_with_context functions pass the caller-supplied buffer size to the decoder without validating it against the actual length of the Python buffer. Data read beyond the buffer may be exposed through nd_get_instrux_bytes, which returns a fixed-length list of 16 bytes. Exploitation requires an application to invoke the affected APIs with a short buffer or an oversized length and to expose the resulting bytes to an attacker. The pybddisasm package is no longer maintained.
References
Fix within
Internet-facing 60 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker partial control
Severity
6.3 Medium
Exploitation
<1% chance of attack within 30 days
Type
CWE-125Out-of-bounds Read
Timeline
Published3 Nov 2026
Updated4 Nov 2026
First seen3 Nov 2026
Sources
CVE-2026-118444 · NVD
CVE-2026-118444 · MITRE
UBUNTU-CVE-2026-118444 · OSV
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