SB2026110721 - Multiple vulnerabilities in Communications Unified Assurance

Description

This security bulletin contains information about 14 vulnerabilities.

1) 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.

2) Improper input validation (CVE-ID: CVE-2026-46863)

CWE-ID: CWE-20 - Improper input validation

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 non-authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper input validation within the Server: Connection Handling component in MySQL Cluster. A remote non-authenticated attacker can exploit this vulnerability to perform a denial of service (DoS) attack.

3) Resource exhaustion (CVE-ID: CVE-2026-42587)

CWE-ID: CWE-400 - Resource exhaustion

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 resource consumption in HttpContentDecompressor and DelegatingDecompressorFrameListener when processing compressed HTTP request bodies with Content-Encoding set to br, zstd, or snappy. A remote attacker can send a specially crafted compressed payload to cause a denial of service.

The configured maxAllocation limit is enforced for gzip and deflate, but is silently ignored for brotli, zstd, and snappy. The issue affects both HTTP/1.1 and HTTP/2 handling.

4) Improper Certificate Validation (CVE-ID: CVE-2026-34500)

CWE-ID: CWE-295 - Improper Certificate Validation

CVSSv4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote user to bypass client certificate authentication.

The vulnerability exists due to improper certificate validation in CLIENT_CERT authentication when processing OCSP checks with FFM and soft-fail disabled. A remote user can present a certificate in affected scenarios to bypass client certificate authentication.

Only some scenarios using FFM are affected.

5) Improper Encoding or Escaping of Output (CVE-ID: CVE-2026-34480)

CWE-ID: CWE-116 - Improper Encoding or Escaping of Output

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 log event loss.

The vulnerability exists due to improper output neutralization in XmlLayout when processing log messages or MDC values containing XML 1.0 forbidden characters. A remote attacker can supply crafted input containing forbidden characters to cause log event loss.

The impact depends on the StAX implementation in use: built-in JRE StAX may produce malformed XML that downstream parsers reject, while alternative implementations may throw an exception during the logging call so the event is delivered only to Log4j's internal status logger.

6) Improper input validation (CVE-ID: CVE-2026-23903)

CWE-ID: CWE-20 - Improper input validation

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 non-authenticated attacker to gain access to sensitive information.

The vulnerability exists due to improper input validation within the Third Party (Apache Shiro) component in Oracle Communications Session Report Manager. A remote non-authenticated attacker can exploit this vulnerability to gain access to sensitive information.

7) Input validation error (CVE-ID: CVE-2026-22747)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 7.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote user to impersonate another user.

The vulnerability exists due to improper input validation in SubjectX500PrincipalExtractor when processing malformed X.509 certificate CN values. A remote user can present a carefully crafted certificate to impersonate another user.

Exploitation presupposes compromise of a trusted upstream that validates the presented credentials in the pre-authentication flow.

8) XML External Entity injection (CVE-ID: CVE-2026-24400)

CWE-ID: CWE-611 - Improper Restriction of XML External Entity Reference ('XXE')

CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to `org.assertj.core.util.xml.XmlStringPrettyFormatter`: the `toXmlDocument(String)` method initializes `DocumentBuilderFactory` with default settings, without disabling DTDs or external entities. A remote attacker can pass a specially crafted XML code to the affected application and view contents of arbitrary files on the system or initiate requests to external systems.

Successful exploitation of the vulnerability may allow an attacker to view contents of arbitrary file on the server or perform network scanning of internal and external infrastructure.

9) Improper access control (CVE-ID: CVE-2026-40976)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to gain unauthorized access to all endpoints.

The vulnerability exists due to improper access control in the default web security filter chain when handling requests in certain actuator configurations. A remote attacker can send requests to application endpoints to gain unauthorized access to all endpoints.

Only servlet-based web applications that rely on the default web security filter chain, depend on spring-boot-actuator-autoconfigure, and do not depend on spring-boot-health are vulnerable.

10) Out-of-bounds read (CVE-ID: CVE-2025-64713)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/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 out-of-bounds read in frame_offset_bottom array in fast interpreter mode when loading WASM bytecode containing a GET_GLOBAL(I32) opcode immediately followed by an if opcode. A remote attacker can load a specially crafted WASM module to cause a denial of service.

Exploitation requires fast interpreter mode to be enabled.

11) Improper input validation (CVE-ID: CVE-2026-24051)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 5.4 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to execute arbitrary code.

The vulnerability exists due to improper input validation within the Core (OpenTelemetry-Go) component in Oracle Communications Unified Assurance. A local privileged user can exploit this vulnerability to execute arbitrary code.

12) Heap-based buffer overflow (CVE-ID: CVE-2026-9256)

CWE-ID: CWE-122 - Heap-based Buffer Overflow

CVSSv4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to heap-based buffer overflow in ngx_http_rewrite_module when processing crafted HTTP requests that trigger rewrite directives using overlapping PCRE captures and multiple capture references in a redirect or arguments context. A remote attacker can send crafted HTTP requests to execute arbitrary code or crash the web server.

There is no control plane exposure; this is a data plane issue only. Code execution is possible on systems with ASLR disabled or when ASLR can be bypassed.

13) NULL pointer dereference (CVE-ID: CVE-2025-6491)

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 perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the PHP SOAP extension. A remote attacker can pass a large XML namespace prefix to the application and perform a denial of service (DoS) attack.

14) Input validation error (CVE-ID: CVE-2026-27135)

CWE-ID: CWE-20 - Improper input validation

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 missing state validation in the nghttp2 session handling logic when processing malformed frames after session termination has been initiated. A remote attacker can send specially crafted frames to cause a denial of service.

For PRIORITY_UPDATE and ALTSVC frames, the affected extension types must be explicitly enabled. Builds with assertions disabled may not crash under the same conditions.

Remediation

Install update from vendor's website.

References

• https://www.oracle.com/security-alerts/cpujul2026.html