CVE-2026-19445
CVE CVE-2026-19445EUVD EUVD-2026-90077Published 2026-09-30T16:16:04.000ZLast changed 2026-10-01T00:44:57.000ZCVSS 9.2
What the advisory describes
A remote, unauthenticated TLS client can make a server crash or call through a freed pointer if its sni_callback assigns a different context to SSLSocket.context (the documented way to select a certificate per server name) and nothing else keeps the original ssl.SSLContext alive. Typical cases are servers that create an SSLContext per connection or replace it while connections are open; servers that wrap their listening socket with it are not affected. Mitigation: keep a reference to every SSLContext that sets sni_callback for the lifetime of the server. TLS clients are not affected.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Python Software Foundation — CPython 3.13.0 <3.13.16; 3.14.0 <3.14.8; 0 <3.12.15; 3.15.0a1 <3.15.0
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Python — CPython
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