Resource exhaustion in python-cryptography - #VU140696
Published: August 1, 2026
Vulnerability identifier: #VU140696
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Affected software:
python-cryptography
python-cryptography
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled resource consumption in the certificate chain path-building logic when processing invalid certificate chains containing duplicate self-signed certificates. A remote attacker can supply a crafted certificate chain to cause a denial of service.
The issue affects availability only; certificate validation correctness is not affected.
Remediation
Install security update from vendor's website.