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python-cryptography CVE-2026-69248

| EUVDEUVD-2026-52448 MEDIUM
Improper Certificate Validation (CWE-295)
2026-08-03 GitHub_M GHSA-m2h6-j472-rp4c
Python Information Disclosure Cryptography Suse
6.9
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
6.9 MEDIUM
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
vuln.today AI
6.5 MEDIUM

AV:N as the flaw is triggered by presenting crafted certificates over the network; AC:H reflects the specific prerequisite of a constrained sub-CA with permittedSubtrees; I:H for certificate trust bypass enabling domain impersonation.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
5.4 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch available
Aug 03, 2026 - 22:17 EUVD
Source Code Evidence Fetched
Aug 03, 2026 - 22:06 vuln.today
Analysis Generated
Aug 03, 2026 - 22:06 vuln.today
CVE Published
Aug 03, 2026 - 21:21 cve.org
MEDIUM 6.9

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 1,141 pypi packages depend on cryptography (268 direct, 879 indirect)

Ecosystem-wide dependent count for version 49.0.0.

DescriptionCVE.org

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 49.0.0, 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.

AnalysisAI

Wildcard DNS SAN matching in python-cryptography's X.509 chain verifier prior to 49.0.0 allows a leaf certificate bearing *.example.com to satisfy a constrained intermediate CA's permittedSubtrees restriction of foo.example.com, enabling scope escape to sibling domains such as bar.example.com. Applications relying on the PolicyBuilder/Store verification API are exposed to acceptance of invalid certificate chains that should be rejected per RFC 5280 §4.2.1.10. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation Exploitation requires three concurrent conditions: (1) the verifying application must use python-cryptography's native X.509 verification API (cryptography.x509.verification.PolicyBuilder and Store), not OpenSSL-backed verification; (2) the certificate chain must include an intermediate CA whose BasicConstraints marks it as a CA and whose NameConstraints extension specifies a permittedSubtrees list containing a specific DNS name (e.g., foo.example.com); and (3) the attacker must present or obtain a leaf certificate issued under that constrained sub-CA bearing a wildcard DNS SAN broader than the constraint (e.g., *.example.com). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N) scores 6.9 with high integrity impact, reflecting the ability to present certificates as valid for domains outside the constrained sub-CA's permitted scope. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade to python-cryptography 49.0.0 or later via pip install 'cryptography>=49.0.0'. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise Micro 5.3 Not-Affected

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CVE-2026-69248 vulnerability details – vuln.today
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