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RHEL 9 : Red Hat Single Sign-On 7.6.13 security update on RHEL 9 (Important) (RHSA-2026:76130)

critical Nessus Plugin ID 363125

Synopsis

The remote Red Hat host is missing one or more security updates for Red Hat Single Sign-On 7.6.13.

Description

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:76130 advisory.

 Red Hat Single Sign-On 7.6 is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications.

 This release of Red Hat Single Sign-On 7.6.13 on RHEL 9 serves as a replacement for Red Hat Single Sign-On 7.6.12, and includes bug fixes and enhancements, which are documented in the Release Notes document linked to in the References.

 Security Fix(es):
 * undertow-core: Undertow MadeYouReset HTTP/2 DDoS Vulnerability (CVE-2025-9784)
 * Undertow HTTP Server Fails to Reject Malformed Host Headers Leading to Potential Cache Poisoning and SSRF (CVE-2025-12543)
 * Undertow HTTP Server Fails to Reject Malformed Host Headers Leading to Potential Cache Poisoning and SSRF (CVE-2025-12543)
 * Information disclosure and data deletion via second-order SQL injection (CVE-2026-0603)
 * GOSTCTR implementation unable to process more than 255 blocks correctly (CVE-2025-14813)
 * PKIX draft CompositeVerifier accepts empty signature sequence as valid (CVE-2026-5588)
 * unbounded PGP AEAD chunk size leads to pre-auth resource exhaustion (CVE-2026-3505)
 * High integrity impact due to improper DNS domain name constraint enforcement (CVE-2026-42579)
 * HTTP Request Smuggling due to improper handling of conflicting HTTP/1.0 headers (CVE-2026-42581)
 * HTTP Header Injection via HttpProxyHandler Disabled Validation (CVE-2026-42578)
 * Denial of Service via unbounded memory allocation in HTTP content decompression (CVE-2026-42587)
 * Denial of Service via unbounded memory allocation in HTTP content decompression (CVE-2026-42587)
 * IPv6 subnet rule bypass due to incorrect masking operation (CVE-2026-44249)
 * Denial of Service via malformed HAProxy message (CVE-2026-44893)
 * Denial of Service due to resource leak (CVE-2026-48043)
 * Netty HAProxy PROXY protocol v2 codec: Denial of Service via memory leak from crafted PROXY protocol headers (CVE-2026-48059)
 * Netty has Insufficient Bailiwick Validation for NS Records (CVE-2026-47691)
 * Improper trust manager handling leads to hostname verification bypass (CVE-2026-50010)
 * Information disclosure and data manipulation due to improper CNAME record validation (CVE-2026-45674)
 * Denial of Service due to eager buffer allocation in TLS handshake (CVE-2026-45416)
 * Arbitrary code execution via PolymorphicTypeValidator bypass (CVE-2026-54512)
 * Denial of Service via deeply nested JSON processing (CVE-2026-50193)
 * Denial of Service via incomplete fix in async JSON parser (CVE-2026-68494)
 * Missing authentication on EAP's IIOP NameService leads to MITM or DoS (CVE-2026-15563)
 * Session fixation in OIDC login flow that can lead to account takeover (CVE-2026-7507)
 * Denial of Service via specially crafted SAML input (CVE-2026-7307)
 * Denial of Service due to excessive SAMLRequest decompression (CVE-2026-2575)
 * Denial of Service via excessive processing of OpenID Connect scope parameters (CVE-2026-4634)
 * Unauthorized access via improper validation of encrypted SAML assertions (CVE-2026-2092)

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

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL Red Hat Single Sign-On 7.6.13 package based on the guidance in RHSA-2026:76130.

See Also

https://access.redhat.com/errata/RHSA-2026:76130

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

http://www.nessus.org/u?97e4890a

Plugin Details

Severity: Critical

ID: 363125

File Name: redhat-RHSA-2026-76130.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/6/2026

Updated: 10/6/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.5

Percentile: 96.92

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: CVE-2026-42581

CVSS v3

Risk Factor: Critical

Base Score: 10

Temporal Score: 9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS Score Source: CVE-2026-47691

CVSS v4

Risk Factor: Critical

Base Score: 9.3

Threat Score: 8.4

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

CVSS Score Source: CVE-2025-14813

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:rh-sso7-keycloak-server, p-cpe:/a:redhat:enterprise_linux:rh-sso7-keycloak

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/6/2026

Vulnerability Publication Date: 9/2/2025

Reference Information

CVE: CVE-2025-12543, CVE-2025-14813, CVE-2025-9784, CVE-2026-0603, CVE-2026-15563, CVE-2026-2092, CVE-2026-2575, CVE-2026-3505, CVE-2026-42578, CVE-2026-42579, CVE-2026-42581, CVE-2026-42587, CVE-2026-44249, CVE-2026-44893, CVE-2026-45416, CVE-2026-45674, CVE-2026-4634, CVE-2026-47691, CVE-2026-48043, CVE-2026-48059, CVE-2026-50010, CVE-2026-50193, CVE-2026-54512, CVE-2026-5588, CVE-2026-68494, CVE-2026-7307, CVE-2026-7507

CWE: 1050, 1286, 1287, 20, 290, 306, 327, 346, 347, 409, 444, 502, 770, 772, 805, 89, 93

RHSA: 2026:76130