5.3

CVE-2026-34073: cryptography has incomplete DNS name constraint enforcement on peer names

Modified
AliasesALPINE-CVE-2026-34073SUSE-SU-2026:21116-1SUSE-SU-2026:21126-1
Published 31-03-2026Last modified 14-10-2026

Vulnerability summary

CVE-2026-34073 is a medium (CVSS 5.3) Improper Certificate Validation vulnerability in cryptography.io cryptography. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 13.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 1.7, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.3/10
010
Medium · v3.1 (NVD)
EPSS score
0.23%
0%100%
Low · +0.06 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 4
OPENSUSE-SU-2026:20506-1RHSA-2026:7295SUSE-SU-2026:21021-1SUSE-SU-2026:21165-1CGA-Q9MV-C959-35CJ

Timeline

  1. 31-03-2026
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

Description

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to version 46.0.6, DNS name constraints were only validated against SANs within child certificates, and not the "peer name" presented during each validation. Consequently, cryptography would allow a peer named bar.example.com to validate against a wildcard leaf certificate for *.example.com, even if the leaf's parent certificate (or upwards) contained an excluded subtree constraint for bar.example.com. This issue has been patched in version 46.0.6.

CVSS metrics

10 scores · 8 sources · 2 versions

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

Increase +0.06 pp

From 0.17% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard51 products
  • airflow-2< 2.11.2-r5
  • airflow-3< 3.1.8-r10
  • airflow-core-2< 2.11.2-r3
  • airflow-core-3< 3.1.8-r3
  • ansible-operator< 1.42.2-r1
Wolfi18 products
  • airflow-3< 3.1.8-r10
  • dask-kubernetes< 2026.3.0-r2
  • datadog-agent-7.72-core-integrations< 7.72.4-r27
  • datadog-agent-7.73-core-integrations< 7.73.3-r23
  • datadog-agent-7.74-core-integrations< 7.74.1-r19
Suse2 products
  • python-cryptography&distro=SUSE Linux Micro 6.0< 42.0.4-4.1
  • python-cryptography&distro=SUSE Linux Micro 6.1< 42.0.4-slfo.1.1_4.1
Alpine1 product
  • py3-cryptography< 46.0.7-r0
Cryptography.io1 product
Debian1 product
  • python-cryptographyAll versions (No fix recorded) | < 46.0.6-1
Opensuse1 product
  • python-cryptography&distro=openSUSE Tumbleweed< 46.0.6-1.1
Pyca1 product
PyPI1 product
  • cryptography< 46.0.6
Ubuntu1 product
  • python-cryptographyAll versions (No fix recorded)

10 vendors · 78 products

References

14 links
Show all 14 references