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Fencer Vulns
high 8.7

CVE-2026-69249 json

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

published 2026-08-03 3 mo ago modified 2026-10-23 16 d ago also GHSA-jwv3-5hgf-82ww , PYSEC-2026-3553 , EUVD-2026-52450

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 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

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, python3.11-cryptography 42.0.5-1.el9ap, 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 1 more
  • 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
3 mo ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 Vulns 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.