RHSA-2026:25237 - 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: Heap buffer overflow due to signed integer overflow in Unicode output sizing (CVE-2026-7383)
• openssl: OpenSSL: Denial of Service due to heap out-of-bounds read in CMS password-based decryption (CVE-2026-9076)
• openssl: OpenSSL: Heap buffer over-read in ASN.1 decoding can lead to denial of service or information disclosure. (CVE-2026-34180)
• openssl: PKCS#12 Files with PBMAC1 Are Accepted with Short HMAC Keys (CVE-2026-34181)
• openssl: CMS AuthEnvelopedData Processing May Accept Forged Messages (CVE-2026-34182)
• openssl: Unbounded Memory Growth in the QUIC PATH_CHALLENGE Handler (CVE-2026-34183)
• openssl: NULL pointer dereference in QUIC server initial packet handling (CVE-2026-42764)
• openssl: Possible NULL Dereference in Password-Based CMS Decryption (CVE-2026-42766)
• openssl: NULL Pointer Dereference in CRMF EncryptedValue Decryption (CVE-2026-42767)
• openssl: Multi-RecipientInfo Bleichenbacher Oracle in CMS_decrypt() and PKCS7_decrypt() (CVE-2026-42768)
• openssl: Trust-Anchor Substitution via cert/issuer Typo in CMP rootCaKeyUpdate (CVE-2026-42769)
• openssl: FFC-DH Peer Validation Uses Attacker-Supplied q (CVE-2026-42770)
• openssl: AES-OCB IV Ignored on EVP_Cipher() Path (CVE-2026-45445)
• openssl: Incorrect Tag Processing for Empty Messages in AES-GCM-SIV and AES-SIV modes (CVE-2026-45446)
• openssl: Heap Use-After-Free in OpenSSL PKCS7_verify() (CVE-2026-45447)

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 - 2481879 - CVE-2026-7383 openssl: OpenSSL: Heap buffer overflow due to signed integer overflow in Unicode output sizing
• BZ - 2481880 - CVE-2026-9076 openssl: OpenSSL: Denial of Service due to heap out-of-bounds read in CMS password-based decryption
• BZ - 2481881 - CVE-2026-34180 openssl: OpenSSL: Heap buffer over-read in ASN.1 decoding can lead to denial of service or information disclosure.
• BZ - 2481882 - CVE-2026-34181 openssl: PKCS#12 Files with PBMAC1 Are Accepted with Short HMAC Keys
• BZ - 2481884 - CVE-2026-34182 openssl: CMS AuthEnvelopedData Processing May Accept Forged Messages
• BZ - 2481885 - CVE-2026-34183 openssl: Unbounded Memory Growth in the QUIC PATH_CHALLENGE Handler
• BZ - 2481887 - CVE-2026-42764 openssl: NULL pointer dereference in QUIC server initial packet handling
• BZ - 2481890 - CVE-2026-42766 openssl: Possible NULL Dereference in Password-Based CMS Decryption
• BZ - 2481891 - CVE-2026-42767 openssl: NULL Pointer Dereference in CRMF EncryptedValue Decryption
• BZ - 2481892 - CVE-2026-42768 openssl: Multi-RecipientInfo Bleichenbacher Oracle in CMS_decrypt() and PKCS7_decrypt()
• BZ - 2481893 - CVE-2026-42769 openssl: Trust-Anchor Substitution via cert/issuer Typo in CMP rootCaKeyUpdate
• BZ - 2481894 - CVE-2026-42770 openssl: FFC-DH Peer Validation Uses Attacker-Supplied q
• BZ - 2481896 - CVE-2026-45445 openssl: AES-OCB IV Ignored on EVP_Cipher() Path
• BZ - 2481897 - CVE-2026-45446 openssl: Incorrect Tag Processing for Empty Messages in AES-GCM-SIV and AES-SIV modes
• BZ - 2481898 - CVE-2026-45447 openssl: Heap Use-After-Free in OpenSSL PKCS7_verify()

CVEs

• CVE-2026-7383
• CVE-2026-9076
• CVE-2026-34180
• CVE-2026-34181
• CVE-2026-34182
• CVE-2026-34183
• CVE-2026-42764
• CVE-2026-42766
• CVE-2026-42767
• CVE-2026-42768
• CVE-2026-42769
• CVE-2026-42770
• CVE-2026-45445
• CVE-2026-45446
• CVE-2026-45447

References

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