Python-cryptography: bleichenbacher timing oracle attack against rsa decryption - incomplete fix for cve-2020-25659
Priority HIGH 66CWE-203Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-203.
Summary
A flaw was found in the python-cryptography package. This issue may allow a remote attacker to decrypt captured messages in TLS servers that use RSA key exchanges, which may lead to exposure of confidential or sensitive data.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01118 66th percentileScored 2026-11-07
Fix Partial python-cryptography: 42.0.0cryptography (PyPI): 42.0.0Red Hat: 3 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | python-cryptography | 3.2 to before 42.0.0 | 42.0.0 | Patch available | CNA |
| Red Hat | Red Hat Ansible Automation Platform 2 | — | — | Not affected | CNA |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | Not affected | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | — | Not affected | CNA |
| Red Hat | Red Hat Satellite 6 | — | — | Not affected | CNA |
| Red Hat | Red Hat Update Infrastructure 4 for Cloud Providers | — | — | No fix listed | CNA |
| — | cryptography (PyPI) | before 42.0.0 | 42.0.0 | Patch available | GHSA-3ww4-gg4f-jr7f |
- python-cryptography Vendor— Affected 3.2 to before 42.0.0 Fixed in 42.0.0 Patch available CNA
- Red Hat Ansible Automation Platform 2 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Satellite 6 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Update Infrastructure 4 for Cloud Providers VendorRed Hat Affected — Fixed in — No fix listed CNA
- cryptography (PyPI) Vendor— Affected before 42.0.0 Fixed in 42.0.0 Patch available GHSA-3ww4-gg4f-jr7f
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:redhat:ansible_automation_platform:2.0:*:*:*:*:*:*:* | 2.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Red Hat |
| cpe:2.3:a:redhat:update_infrastructure:4:*:*:*:*:*:*:* | 4 | Vulnerable | Red Hat |
| cpe:2.3:a:cryptography.io:cryptography:*:*:*:*:*:python:*:* | before 42.0.0 | Vulnerable | Cryptography.io |
| cpe:2.3:a:couchbase:couchbase_server:7.6.0:*:*:*:*:*:*:* | 7.6.0 | Vulnerable | Couchbase |
| cpe:2.3:a:couchbase:couchbase_server:7.6.1:*:*:*:*:*:*:* | 7.6.1 | Vulnerable | Couchbase |
- cpe:2.3:a:redhat:ansible_automation_platform:2.0:*:*:*:*:*:*:* Versions 2.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
- cpe:2.3:a:redhat:update_infrastructure:4:*:*:*:*:*:*:* Versions 4 Vulnerable ·Red Hat
- cpe:2.3:a:cryptography.io:cryptography:*:*:*:*:*:python:*:* Versions before 42.0.0 Vulnerable ·Cryptography.io
- cpe:2.3:a:couchbase:couchbase_server:7.6.0:*:*:*:*:*:*:* Versions 7.6.0 Vulnerable ·Couchbase
- cpe:2.3:a:couchbase:couchbase_server:7.6.1:*:*:*:*:*:*:* Versions 7.6.1 Vulnerable ·Couchbase
Remediation
- Fix · CNA python-cryptography Fixed in 42.0.0
- Fix · GHSA-3ww4-gg4f-jr7f cryptography (PyPI) Fixed in 42.0.0 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Update Infrastructure 4 for Cloud Providers | Affected | No fix yet |
Not affected: 4 products
- Red Hat Ansible Automation Platform 2
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Satellite 6
Timeline
- 2026-10-02 Threatist record created from CVE-2023-50782
- 2026-10-03 Alias added: GHSA-3ww4-gg4f-jr7f
References
More Red Hat Ansible Automation Platform vulnerabilities
- TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
- TI-2026-35991 Starlette has missing Host header validation that poisons request.url.path, bypassing path-based security checks KEVCVSS 3.1MEDIUM 6.5
- TI-2026-34281 JavaScript Cookie: Per-instance prototype hijack in assign() enables cookie-attribute injection CVSS 3.1HIGH 7.5
- TI-2026-28834 jq: Out-of-Bounds Read in jv_parse_sized() Error Formatting for Non-NUL-Terminated Counted Buffers CVSS 4.0MEDIUM 6.9
- TI-2026-32429 Axios: Credential Theft and Response Hijacking via Prototype Pollution Gadget in Config Merge CVSS 3.1HIGH 7.7
- TI-2022-03352 Insufficiently protected credentials in pulp_ansible CVSS 3.1MEDIUM 5.5
Sources
- CVE-2023-50782 · CVE Program
- CVE-2023-50782 · NVD
- FIRST EPSS
- GHSA-3ww4-gg4f-jr7f · GitHub Advisory Database · CC BY 4.0
- CVE-2023-50782 · Red Hat security data · CC BY 4.0
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