Red Hat Security Advisory: OpenShift Container Platform 4.19.39 bug fix and security update

CVE-2026-4890 — dnsmasq: NSEC bitmap parsing infinite loop CVE-2026-4891 — dnsmasq: RRSIG rdlen underflow leading to heap OOB read CVE-2026-4892 — dnsmasq: DHCPv6 CLID buffer overflow in helper process CVE-2026-4893 — dnsmasq: Broken ECS source validation bypass CVE-2026-5260 — gnutls: gnutls: Information disclosure via heap overread in RSA key exchange CVE-2026-5450 — glibc: glibc: Heap Buffer Overflow in scanf with %mc format specifier and large width CVE-2026-42009 — gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability CVE-2026-42010 — gnutls: gnutls: Authentication Bypass via NUL Character in Username CVE-2026-42011 — gnutls: gnutls: Security bypass due to incorrect name constraint handling CVE-2026-42013 — gnutls: gnutls: Certificate validation bypass due to oversized Subject Alternative Name