SB20261110102 - Multiple vulnerabilities in Oracle Communications Cloud Native Core Console

Description

This security bulletin contains information about 7 vulnerabilities.

1) Improper input validation (CVE-ID: CVE-2026-5704)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 5.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local authenticated user to manipulate data.

The vulnerability exists due to improper input validation within the Configuration (node-tar) component in Oracle Communications Cloud Native Core Console. A local authenticated user can exploit this vulnerability to manipulate data.

2) Algorithm Downgrade (CVE-ID: CVE-2026-54291)

CWE-ID: CWE-757 - Selection of Less-Secure Algorithm During Negotiat

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to bypass channel-binding protection and enable a man-in-the-middle downgrade of authentication.

The vulnerability exists due to failing open and algorithm downgrade in ScramAuthenticator when processing certificates whose signature algorithm has no tls-server-end-point channel-binding hash. A remote attacker can present a certificate with an unsupported signature algorithm while intercepting the TLS connection to bypass channel-binding protection and enable a man-in-the-middle downgrade of authentication.

Only connections configured with channelBinding=require are affected.

3) Improper input validation (CVE-ID: CVE-2026-55858)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a remote non-authenticated attacker to manipulate data.

The vulnerability exists due to improper input validation within the Configuration (JDBC) component in Oracle Communications Cloud Native Core Console. A remote non-authenticated attacker can exploit this vulnerability to manipulate data.

4) Input validation error (CVE-ID: CVE-2026-13321)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to poison the DNS cache and cause authenticated denial-of-service responses.

The vulnerability exists due to improper input validation in DNSSEC NSEC record validation when processing validly signed NSEC records whose next domain name points outside the signer's zone. A remote attacker can craft malicious NSEC records to poison the DNS cache and cause authenticated denial-of-service responses.

Exploitation requires control of any DNSSEC-signed zone.

5) Integer underflow (CVE-ID: CVE-2026-58016)

CWE-ID: CWE-191 - Integer underflow

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 perform a denial of service attack.

The vulnerability exists due to state confusion issue exists in g_dbus_node_info_new_for_xml() in the gio/gdbusintrospection.c file when processing malformed D-Bus introspection XML, specifically with a `node` element nested within other elements like `method`, `signal`, `property` or `arg`. A remote attacker can send a specially crafted request to the affected application, trigger an unsigned integer overflow and lead to an out-of-bounds read, resulting in a denial of service.

6) Improper input validation (CVE-ID: CVE-2026-84939)

CWE-ID: CWE-20 - Improper input validation

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 non-authenticated attacker to read and manipulate data.

The vulnerability exists due to improper input validation within the Core (Apache FreeMarker) component in Oracle Communications Unified Assurance. A remote non-authenticated attacker can exploit this vulnerability to read and manipulate data.

7) Improper input validation (CVE-ID: CVE-2026-6653)

CWE-ID: CWE-20 - Improper input validation

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

The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.

The vulnerability exists due to improper input validation within the Console (libxml2) component in Oracle Communications Cloud Native Core Console. A remote non-authenticated attacker can exploit this vulnerability to execute arbitrary code.

Remediation

Install update from vendor's website.

References

• https://www.oracle.com/security-alerts/cpuoct2026.html