SB2026092457 - Red Hat Enterprise Linux 10 update for openssl
Published: September 24, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 7 vulnerabilities.
1) Cleartext transmission of sensitive information (CVE-ID: CVE-2025-69418)
CWE-ID: CWE-319 - Cleartext Transmission of Sensitive Information
CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to the trailing 1-15 bytes of a message may be exposed in cleartext on encryption and are not covered by the authentication tag. When using the low-level OCB API directly with AES-NI or other hardware-accelerated code paths, inputs whose length is not a multiple of 16 bytes can leave the final partial block unencrypted and unauthenticated. A remote attacker can intercept traffic and gain access to potentially sensitive information.
2) Unchecked Return Value (CVE-ID: CVE-2026-31790)
CWE-ID: CWE-252 - Unchecked Return Value
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to incorrect failure handling in RSA KEM RSASVE encapsulation when processing an attacker-supplied invalid RSA public key with EVP_PKEY_encapsulate(). A remote attacker can supply an invalid RSA public key to disclose sensitive information.
The issue affects applications using RSA/RSASVE encapsulation without validating the supplied public key first.
3) NULL pointer dereference (CVE-ID: CVE-2026-28390)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to NULL pointer dereference in CMS KeyTransportRecipientInfo processing when processing a crafted CMS EnvelopedData message using RSA-OAEP with a missing optional parameters field. A remote attacker can send a crafted CMS message to cause a denial of service.
Applications and services that call CMS_decrypt() on untrusted input, such as S/MIME processing or CMS-based protocols, are affected.
4) Input validation error (CVE-ID: CVE-2026-34182)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass integrity validation.
The vulnerability exists due to improper input validation in CMS AuthEnvelopedData processing when decrypting crafted AuthEnvelopedData containers. A remote attacker can send a specially crafted CMS message to bypass integrity validation.
In some cases, if the application exposes decryption success or failure, the issue can be used as an oracle to obtain key-equivalent functionality for the content-encryption key.
5) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2026-34183)
CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled memory allocation in the QUIC PATH_CHALLENGE handler when processing floods of PATH_CHALLENGE frames. A remote attacker can send a flood of PATH_CHALLENGE frames to cause a denial of service.
The issue affects applications acting as a QUIC client or server.
6) Improper Initialization (CVE-ID: CVE-2026-45445)
CWE-ID: CWE-665 - Improper Initialization
CVSSv4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to forge arbitrary ciphertext.
The vulnerability exists due to improper initialization in the AES-OCB EVP_Cipher() one-shot path when processing AES-OCB operations through the public EVP_Cipher() interface. A local user can invoke the one-shot API on an AES-OCB context to forge arbitrary ciphertext.
Only applications that combine AES-OCB with the EVP_Cipher() one-shot API are affected; applications using the documented streaming AEAD API are not affected.
7) Use-after-free (CVE-ID: CVE-2026-45447)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to use-after-free in the PKCS7_verify() function when processing a specially crafted PKCS#7 or S/MIME signed message during PKCS#7 signature verification. A remote attacker can send a specially crafted signed message to execute arbitrary code.
Applications using the CMS APIs for this processing are not affected.
Remediation
Install update from vendor's website.