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Fencer Intel
high 8.7

CVE-2026-69249 json

python-cryptography: Duplicate self-signed intermediates can cause exponential path-building

published 3mo ago modified 19d ago also EUVD-2026-52450 , GHSA-jwv3-5hgf-82ww , PYSEC-2026-3553

cvss
8.7
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

python-cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In versions 42.0.0 through 48.0.0, when resolving invalid certificate chains that include duplicate copies of self-signed certificates, the processing recursively invokes the same candidate, leading to an exponential blowup. Although the limitation that the chain depth cannot exceed a specified maximum depth prevents unbounded recursion and guarantees termination, an attacker-controlled certificate chain can lead the processing to easily take more than 5s to reject in testing. This amplification could form the basis for a resource exhaustion denial of service attack. The core issue arises in the recursive nature of build_chain_inner, which does not de-duplicate against previously analyzed candidates. As the correctness of validation is not affected, the integrity of a system cannot be compromised through this vector, only its availability. This issue is fixed in 49.0.0.

Patch / fix

  • pypi cryptography 49.0.0
  • python-cryptography_project python-cryptography 49.0.0
  • cryptography_project cryptography 49.0.0
  • cryptography.io cryptography 49.0.0
  • python-cryptography Debian 14 49.0.0-1

debian advisories DEBIAN-CVE-2026-69249

  • python-cryptography Ubuntu 26.04 LTS 46.0.5-1ubuntu2.2

ubuntu advisories UBUNTU-CVE-2026-69249

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python-cryptography RHEL 10.2 43.0.0-4.el10_2.5
  • python3-cryptography RHEL 10.2 43.0.0-4.el10_2.5
  • python3.14-cryptography RHEL 10.2 45.0.4-4.el10_2.5
  • python3.14-cryptography RHEL 9 45.0.4-4.el9_8.6
  • python-cryptography hummingbird 1 50.0.0-1.hum1
  • python3-cryptography hummingbird 1 50.0.0-1.hum1
  • python-cryptography enterprise linux eus 10.0 43.0.0-4.el10_0.1
  • python3-cryptography enterprise linux eus 10.0 43.0.0-4.el10_0.1

red hat advisories RHSA-2026:71658RHSA-2026:71659RHSA-2026:64795RHSA-2026:64774RHSA-2026:55543

  • python-cryptography SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 44.0.3-160000.5.1
  • python-cryptography Linux Micro 6.1 42.0.4-slfo.1.1_6.1
  • python-cryptography Linux Micro 6.0 42.0.4-6.1

suse advisories SUSE-SU-2026:23404-1SUSE-SU-2026:23570-1SUSE-SU-2026:23196-1SUSE-SU-2026:23247-1

  • python-cryptography openSUSE Leap 16.0 44.0.3-160000.5.1

opensuse advisories openSUSE-SU-2026:21685-1

  • python3-cryptography AlmaLinux 10 43.0.0-4.el10_2.5
  • python3.14-cryptography AlmaLinux 9 45.0.4-4.el9_8.6
  • python3.14-cryptography AlmaLinux 10 45.0.4-4.el10_2.5

almalinux advisories ALSA-2026:71658ALSA-2026:64774ALSA-2026:64795

  • python-cryptography Rocky Linux 10 43.0.0-4.el10_2.5
  • python3.14-cryptography Rocky Linux 10 45.0.4-4.el10_2.5
  • python3.14-cryptography Rocky Linux 9 45.0.4-4.el9_8.6

rocky linux advisories RLSA-2026:71658RLSA-2026:64795RLSA-2026:64774

  • python-cryptography Azure Linux 3.0 42.0.5-6

azure linux advisories AZL-94584

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2026-69249 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-69249 updated cvss 7.5

python-cryptography: python-cryptography: Duplicate self-signed intermediates can cause exponential path-building

  • Red Hat Ansible Automation Platform 2 python-cryptography 46.0.7-3.el10ap, python3x-cryptography 42.0.5-1.el8ap, python3.12-cryptography 46.0.7-1.el9ap
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9 Red Hat Satellite 6 python-cryptography, python3-cryptography, python-cryptography 46.0.7-3.el10ap, python3.12-cryptography 46.0.7-1.el9ap
    affected: workaround, no fix available
  • Red Hat AI Inference Server 3.4 rhaii/vllm-cpu-rhel9 1790075793, rhaii/vllm-cuda-rhel9 1790090131, rhaii/vllm-rocm-rhel9 1790109620, rhaii/vllm-spyre-rhel9 1790076141
    fixed: vendor fix RHSA-2026:70965
  • Red Hat Enterprise Linux AppStream (v. 9) python3.14-cryptography 45.0.4-4.el9_8.6
    fixed: vendor fix RHSA-2026:64774
  • Red Hat Enterprise Linux AppStream (v. 10) python3.14-cryptography 45.0.4-4.el10_2.5
    fixed: vendor fix RHSA-2026:64795
  • Red Hat Enterprise Linux BaseOS (v. 10) python-cryptography 43.0.0-4.el10_2.5, python3-cryptography 43.0.0-4.el10_2.5
    fixed: vendor fix RHSA-2026:71658
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) python-cryptography 43.0.0-4.el10_0.1, python3-cryptography 43.0.0-4.el10_0.1
    fixed: vendor fix RHSA-2026:71659
  • Red Hat Hardened Images python-cryptography 50.0.0-1.hum1, python3-cryptography 50.0.0-1.hum1
    fixed: vendor fix RHSA-2026:55543
show 2 more
  • Red Hat Ansible Automation Platform 2 python3.11-cryptography 42.0.5-1.el9ap
    not affected: vulnerable code not in execute path
  • Red Hat Enterprise Linux 7 python2-cryptography, python-cryptography 46.0.7-3.el10ap Red Hat Enterprise Linux 8 python3-cryptography, python-cryptography 46.0.7-3.el10ap, python3.12-cryptography 46.0.7-1.el9ap Red Hat Enterprise Linux 9 python3-cryptography, python3.12-cryptography, python-cryptography 46.0.7-3.el10ap, python3.12-cryptography 46.0.7-1.el9ap Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9 Red Hat OpenStack Platform 13 (Queens) python2-cryptography, python-cryptography 46.0.7-3.el10ap
    +1 more products
    Red Hat Update Infrastructure 4 for Cloud Providers python-cryptography 46.0.7-3.el10ap
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
3mo ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/pyca/cryptography/security/advisories/GHSA-jwv3-5hgf-82ww referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 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
CNA 4.0 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/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

Affected packages

ecosystem package affected fixed in
pypi cryptography
>=42.0.0, <49.0.0
<49.0.0
49.0.0

Affected products

  • pyca cryptography

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of pyca/cryptography published their own advisory on GitHub. Reviewed sources take precedence over it.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.