Out-of-bounds read in python-cryptography - CVE-2026-39892
Published: April 8, 2026 / Updated: May 12, 2026
Vulnerability identifier: #VU125339
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-39892
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Python Cryptographic Authority
Affected software:
python-cryptography
python-cryptography
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to out-of-bounds read in Python buffer-accepting APIs when processing a non-contiguous buffer. A local user can pass a specially crafted non-contiguous buffer to cause a denial of service.
The issue can read past the end of the buffer on Python versions later than 3.11.
How to mitigate CVE-2026-39892
Install security update from vendor's website.