High [CVE-2026-19553] Certificate verification bypass via missing server_hostname validation in SSLContext.wrap_bio
This high-severity Red Hat Linux advisory covers CVE-2026-19553; related products: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
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Summary
Certificate verification bypass via missing server_hostname validation in SSLContext.wrap_bio(). Red Hat rates this important (CVSS 7.4).
Weakness: CWE-295. Red Hat lists fixing advisory RHSA-2026:74594 with package python3-12-main-3.12.14-1.4.hum1, python3-13-main-3.13.15-1.4.hum1, python3-11-main-3.11.16-1.5.hum1, python3-14-main-3.14.7-1.3.hum1.
Affected products named by the advisory: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; and 8 more.
Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux AI (RHEL AI) 3; Red Hat Hardened Images; Red Hat OpenShift Virtualization 4; and 4 more.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
- python3-12-main-3.12.14-1.4.hum1
- python3-13-main-3.13.15-1.4.hum1
- python3-11-main-3.11.16-1.5.hum1
- python3-14-main-3.14.7-1.3.hum1
- python3-10-main-3.10.21-1.5.hum1
- RHSA-2026:74594
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation
Upgrade to a fixed release: python3-12-main-3.12.14-1.4.hum1, python3-13-main-3.13.15-1.4.hum1, python3-11-main-3.11.16-1.5.hum1, python3-14-main-3.14.7-1.3.hum1, python3-10-main-3.10.21-1.5.hum1, RHSA-2026:74594. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
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