CVE-2026-69248: python-cryptography verifier accepts wildcard DNS names allowing escape from permittedSubtrees
Vulnerability summary
CVE-2026-69248 is a medium (CVSS 6.9) Improper Certificate Validation vulnerability in pyca cryptography. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15.6% of scored vulnerabilities.
Not severe (CVSS 6.9, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 9 · Related 7Timeline
- 03-08-2026PublishedVulnerability first disclosed.
- 02-09-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
7 scores · 7 sources · 1 version- OSV · PypiEcosystem advisory · calculated8.3HighCVSS: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:PDiffers
- OSV · UbuntuEcosystem advisory · calculated8.3HighCVSS: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:PDiffers
- OSV · DebianEcosystem advisory · calculated8.3HighCVSS: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:XDiffers
- OSV · WolfiEcosystem advisory · calculated8.3HighCVSS: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:PDiffers
- OSV · ChainguardEcosystem advisory · calculated8.3HighCVSS: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:PDiffers
- NVDNIST6.9MediumCVSS: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
EPSS trend
Probability
0.24%
Chance of exploitation in the next 30 days
Percentile
16%
Versus all other CVEs
30-day change
Decrease -0.07 pp
From 0.31% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Chainguard27 products
- airflow-2All versions (No fix recorded)
- airflow-core-2All versions (No fix recorded)
- apache-beam-python-3.11-sdk< 2.75.0-r2
- apache-beam-python-3.12-sdk< 2.75.0-r1
- apache-beam-python-3.13-sdk< 2.75.0-r2
Wolfi8 products
- az< 2.91.0-r0
- datadog-agent-7.75-core-integrationsAll versions (No fix recorded)
- datadog-agent-7.77-core-integrationsAll versions (No fix recorded)
- datadog-agent-7.78-core-integrationsAll versions (No fix recorded)
- datadog-agent-7.79-core-integrationsAll versions (No fix recorded)
Debian1 product
- python-cryptographyAll versions (No fix recorded) | < 49.0.0-1
Opensuse1 product
- matrix-synapse&distro=openSUSE Tumbleweed< 1.163.0-1.1
Pyca1 product
- cryptography< 49.0.0
PyPI1 product
- cryptography≥ 45.0.0, < 49.0.0 | < 49.0.0
Ubuntu1 product
- python-cryptography< 46.0.5-1ubuntu2.2
7 vendors · 40 products
References
15 links- github.com/pyca/cryptography/security/advisories/GHSA-m2h6-j472-rp4cX Refsource CONFIRMWEBREPORTAdvisory
- github.com/pyca/cryptography/commit/4d035a4225965edeffd312079a510ef25fcfdcb2X Refsource MISCWEBREPORTFIX
- github.com/pyca/cryptographyPACKAGE
