Bug 2448508 (CVE-2026-27448)
| Summary: | CVE-2026-27448 pyOpenSSL: TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback | ||
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| Product: | [Other] Security Response | Reporter: | OSIDB Bzimport <bzimport> |
| Component: | vulnerability | Assignee: | Product Security DevOps Team <prodsec-dev> |
| Status: | NEW --- | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | anthomas, aprice, bdettelb, caswilli, doconnor, dranck, dschmidt, eborisov, eglynn, ehelms, erezende, ggainey, jdobes, jjoyce, jkoehler, jlanda, jmitchel, jpretori, jsamir, jschluet, juwatts, jwong, kaycoth, kshier, lball, lbrazdil, lhh, lphiri, mburns, mgarciac, mhulan, mminar, ngough, nmoumoul, oezr, omaciel, orabin, osousa, pbohmill, pcreech, rbiba, rchan, simaishi, smallamp, smcdonal, sskracic, stcannon, teagle, tmalecek, tpfromme, ttakamiy, veshanka, yguenane |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | --- | |
| Doc Text: |
A flaw was found in pyOpenSSL. The set_tlsext_servername_callback callback function can be used to implement Server Name Indication (SNI) during the TLS handshake. When the callback raises an unhandled exception, the handshake incorrectly proceeds instead of terminating. This fail-open behavior can allow an attacker to bypass SNI-based security controls and access restricted endpoints.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | Type: | --- | |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 2450395, 2450396 | ||
| Bug Blocks: | |||
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Description
OSIDB Bzimport
2026-03-18 00:02:29 UTC
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