CPython skips server identity checks in ssl.get_server_certificate
Python rates CVE-2026-19552 low: with ca_certs set, the call checks the chain but not the server identity.
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Vulnerability1 · 1 read
CVE-2026-19552
Missing identity check in CPython ssl.get_server_certificate
- CVSS 4.0
- 0.0 none
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
In CPython, ssl.get_server_certificate() verifies the certificate chain when ca_certs is supplied but never checks the certificate identity. A remote peer can present a chain that validates against those CAs for a different name, with no user interaction. Callers may accept the wrong server identity. Affected builds are not listed.
What to do: Python has not listed a fixed release for CVE-2026-19552.
| Product | Affected |
|---|---|
| Python CPython | — |
Estimated exposure
No basis for an estimate.
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description · NVD
When ca_certs parameter was supplied to ssl.get_server_certificate() function, the identity of the certificate is not checked.
- Vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/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