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Fencer Vulns
medium 6.9

CVE-2026-69248 json

python-cryptography verifier accepts wildcard DNS names allowing escape from permittedSubtrees

published 2026-08-03 3 mo ago modified 2026-10-23 16 d ago also GHSA-m2h6-j472-rp4c , PYSEC-2026-3554 , EUVD-2026-52448

cvss
6.9
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits
0
none known

Summary

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In versions 45.0.0 through 48.0.0, if an intermediate constrained CA permits the DNS name foo.example.com, and the leaf certificate has a wildcard in its DNS SAN of *.example.com, python-cryptography's verifier accepts which allows escaping outside of the permitted names. The core issue is in DNSConstraint::matches, where a wildcard pattern was treated as matching a more-specific permitted constraint even though *.example.com can expand to sibling names such as bar.example.com outside foo.example.com. This allows acceptance of an invalid certificate chain. 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-2026-69248

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

ubuntu advisories UBUNTU-CVE-2026-69248

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

  • 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

red hat advisories RHSA-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

  • matrix-synapse openSUSE Tumbleweed 1.163.0-1.1
  • python-cryptography openSUSE Leap 16.0 44.0.3-160000.5.1

opensuse advisories openSUSE-SU-2026:12133-1openSUSE-SU-2026:21685-1

  • 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-2026:64774ALSA-2026:64795

  • 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-2026:64795RLSA-2026:64774

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-2026-69248 updated cvss 7.4

python-cryptography: python-cryptography: python-cryptography verifier accepts wildcard DNS names allowing escape from permittedSubtrees

  • Red Hat Ansible Automation Platform 2 python-cryptography 46.0.7-3.el10ap, python3.12-cryptography 46.0.7-1.el9ap
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9
    affected: workaround, no fix available
  • Red Hat Satellite 6 python3.12-cryptography 46.0.7-1.el9ap
    affected: workaround, no fix available “Fix deferred”
  • 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 Hardened Images python-cryptography 50.0.0-1.hum1, python3-cryptography 50.0.0-1.hum1
    fixed: vendor fix RHSA-2026:55543
  • Red Hat Ansible Automation Platform 2 python3x-cryptography 42.0.5-1.el8ap, python3.11-cryptography 42.0.5-1.el9ap 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 Enterprise Linux 10 python-cryptography 46.0.7-3.el10ap Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-9
    +4 more products
    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 Red Hat Satellite 6 python-cryptography, python3-cryptography, python-cryptography 46.0.7-3.el10ap 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
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/pyca/cryptography/security/advisories/GHSA-m2h6-j472-rp4c referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
CNA 4.0 6.9 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/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
>=45.0.0, <49.0.0
<49.0.0
49.0.0

Affected products

  • pyca cryptography

Classification

Weakness
  • CWE-295 Improper Certificate Validation

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.