Resource exhaustion in python-cryptography - CVE-2026-69249
Published: August 1, 2026
Vulnerability identifier: #VU140696
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2026-69249
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
python-cryptography
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
openEuler
IBM Security SOAR
python-cryptography-debuginfo
python-cryptography-help
python3-cryptography
python-cryptography-debugsource
python-cryptography
python3.14-cryptography (Red Hat package)
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
openEuler
IBM Security SOAR
python-cryptography-debuginfo
python-cryptography-help
python3-cryptography
python-cryptography-debugsource
python-cryptography
python3.14-cryptography (Red Hat package)
How to mitigate CVE-2026-69249
Install security update from vendor's website.
python-cryptography - update to 49.0.0
IBM Security SOAR - update to 51.0.11.0
python-cryptography-debuginfo - update to 42.0.2-10
python-cryptography-help - update to 42.0.2-10
python3-cryptography - update to 42.0.2-10
python-cryptography-debugsource - update to 42.0.2-10
python-cryptography - update to 42.0.2-10
python3.14-cryptography (Red Hat package) - addressed in versions 45.0.4-4.el9_8.6, 45.0.4-4.el10_2.5
IBM Security SOAR - update to 51.0.11.0
python-cryptography-debuginfo - update to 42.0.2-10
python-cryptography-help - update to 42.0.2-10
python3-cryptography - update to 42.0.2-10
python-cryptography-debugsource - update to 42.0.2-10
python-cryptography - update to 42.0.2-10
python3.14-cryptography (Red Hat package) - addressed in versions 45.0.4-4.el9_8.6, 45.0.4-4.el10_2.5
External References
Related Security Bulletins
- Multiple vulnerabilities in python-cryptography
- openEuler 24.03 LTS SP1 update for python-cryptography
- openEuler 24.03 LTS SP4 update for python-cryptography
- openEuler 24.03 LTS SP3 update for python-cryptography
- Multiple vulnerabilities in IBM Security SOAR
- Red Hat Enterprise Linux 9 update for python3.14-cryptography
- Red Hat Enterprise Linux 10 update for python3.14-cryptography