RHSA-2026:67154 - Security Advisory

Topic

An update for openssl is now available for Red Hat Enterprise Linux 10.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, as well as a full-strength general-purpose cryptography library.

Security Fix(es):

• openssl: OpenSSL: Denial of Service via unbounded memory growth in QUIC server (CVE-2026-14456)
• openssl: QUIC server may trigger double free when processing INITIAL packet (CVE-2026-18798)
• openssl: heap buffer overflow in CMS key unwrapping (CVE-2026-63072)
• openssl: invalid pointer dereference in CMP server via crafted protectionAlg (CVE-2026-63076)
• openssl: RPK server signature algorithm selection can dereference a missing certificate (CVE-2026-14457)
• openssl: excessive memory use buffering DTLS records for a future epoch (CVE-2026-54874)
• openssl: untrusted sender DN used as format string in CMP response validation (CVE-2026-63073)
• openssl: CMP indefinite cache growth of ExtraCerts (CVE-2026-63074)
• openssl: QUIC ACK-only packet retention can cause memory exhaustion (CVE-2026-63075)

Bug Fix(es) and Enhancement(s):

• openssl: HollowByte remote memory-exhaustion DoS fix may be missing [RHEL 10.2.z] (JIRA:RHEL-212362)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 10 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 10.2 x86_64
• Red Hat Enterprise Linux for IBM z Systems 10 s390x
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.2 s390x
• Red Hat Enterprise Linux for Power, little endian 10 ppc64le
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.2 ppc64le
• Red Hat Enterprise Linux for ARM 64 10 aarch64
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.2 aarch64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.2 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.2 s390x
• Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.2 ppc64le
• Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 10.2 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 10.2 aarch64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 10.2 ppc64le
• Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 10.2 s390x

Fixes

• BZ - 2515348 - CVE-2026-14456 openssl: OpenSSL: Denial of Service via unbounded memory growth in QUIC server
• BZ - 2517559 - CVE-2026-18798 openssl: QUIC server may trigger double free when processing INITIAL packet
• BZ - 2517560 - CVE-2026-63072 openssl: heap buffer overflow in CMS key unwrapping
• BZ - 2517561 - CVE-2026-63076 openssl: invalid pointer dereference in CMP server via crafted protectionAlg
• BZ - 2517562 - CVE-2026-14457 openssl: RPK server signature algorithm selection can dereference a missing certificate
• BZ - 2517564 - CVE-2026-54874 openssl: excessive memory use buffering DTLS records for a future epoch
• BZ - 2517565 - CVE-2026-63073 openssl: untrusted sender DN used as format string in CMP response validation
• BZ - 2517566 - CVE-2026-63074 openssl: CMP indefinite cache growth of ExtraCerts
• BZ - 2517570 - CVE-2026-63075 openssl: QUIC ACK-only packet retention can cause memory exhaustion
• RHEL-212362 - openssl: HollowByte remote memory-exhaustion DoS fix may be missing [RHEL 10.2.z]

CVEs

• CVE-2026-14456
• CVE-2026-14457
• CVE-2026-18798
• CVE-2026-54874
• CVE-2026-63072
• CVE-2026-63073
• CVE-2026-63074
• CVE-2026-63075
• CVE-2026-63076

References

• https://access.redhat.com/security/updates/classification/#important