SB2026090219 - Multiple vulnerabilities in IBM QRadar SIEM
Published: September 2, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 21 vulnerabilities.
1) Improper Encoding or Escaping of Output (CVE-ID: CVE-2026-34479)
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 downstream log processing systems to drop or fail to index affected records.
The vulnerability exists due to improper output neutralization in Log4j1XmlLayout when producing XML log output containing characters forbidden by the XML 1.0 standard. A remote attacker can cause such characters to be included in logged data to cause downstream log processing systems to drop or fail to index affected records.
The issue affects configurations using Log4j1XmlLayout directly in a Log4j Core 2 configuration file or through the Log4j 1 configuration compatibility layer with org.apache.log4j.xml.XMLLayout specified as the layout class.
2) OS Command Injection (CVE-ID: CVE-2025-61984)
CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CVSSv4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.
The vulnerability exists due to improper validation of control characters in usernames obtained from an untrusted source (such as command line and %-sequence expansion of a configuration file). A remote attacker can trick the victim into initiating an ssh connection using a specially crafted configuration file and execute arbitrary shell commands on the system.
This vulnerability affects ssh client command and does not affect the sshd daemon.
3) Improper Certificate Validation (CVE-ID: CVE-2026-34477)
CWE-ID: CWE-295 - Improper Certificate Validation
CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a man-in-the-middle attack.
The vulnerability exists due to improper certificate validation in the TLS hostname verification handling of the verifyHostName attribute in Log4j Core SSL configuration when establishing TLS connections for SMTP, Socket, or Syslog appenders. A remote attacker can present a certificate issued by a trusted certificate authority to perform a man-in-the-middle attack.
The issue occurs only when TLS is configured via a nested SSL configuration element, and it does not affect the HTTP appender.
4) Improper Output Neutralization for Logs (CVE-ID: CVE-2026-34478)
CWE-ID: CWE-117 - Improper Output Neutralization for Logs
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to inject arbitrary log entries.
The vulnerability exists due to improper neutralization of CRLF sequences in Rfc5424Layout when processing logged data with direct Rfc5424Layout configuration using TCP framing. A remote attacker can supply specially crafted input containing CRLF sequences to inject arbitrary log entries.
Only users of stream-based syslog services who configure Rfc5424Layout directly are affected. Users of the SyslogAppender are not 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) Use of a broken or risky cryptographic algorithm (CVE-ID: CVE-2026-5588)
CWE-ID: CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass signature verification.
The vulnerability exists due to use of a broken or risky cryptographic algorithm in the PKIX draft CompositeVerifier when processing composite signatures. A remote attacker can provide an empty signature sequence to bypass signature verification.
7) Uncontrolled Recursion (CVE-ID: CVE-2025-9714)
CWE-ID: CWE-674 - Uncontrolled Recursion
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 uncontrolled recursion in XPath evaluation within the xmlXPathRunEval() function in xpath.c. A remote attacker can pass specially crated XML data to the application and perform a denial of service (DoS) attack.
8) Improper authorization (CVE-ID: CVE-2025-66614)
CWE-ID: CWE-285 - Improper Authorization
CVSSv4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass client certificate verification.
The vulnerability exists due to Tomcat does not validate that the host name provided via the SNI extension is the same as the host name provided in the HTTP host header field. If there is more than one virtual host configured and the TLS configuration for one of those hosts does not require client certificate authentication, it is possible for a client to bypass the client certificate authentication for the target host by sending different host names in the SNI extension and the HTTP host header field.
9) Protection mechanism failure (CVE-ID: CVE-2026-24733)
CWE-ID: CWE-693 - Protection Mechanism Failure
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 bypass implemented security restrictions.
The vulnerability exists due to insufficient implementation of security measures when handling HTTP/0.9 requests. If the server is configured to allow HEAD requests to a URI but deny GET requests, an attacker can bypass that constraint on GET requests by sending a (specification invalid) HEAD request.
10) Improper Neutralization of Null Byte or NUL Character (CVE-ID: CVE-2025-61985)
CWE-ID: CWE-158 - Improper Neutralization of Null Byte or NUL Character
CVSSv4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to execute arbitrary OS commands on the system.
The vulnerability exists due to incorrect handling of the nullbyte character in an ssh:// URI if a ProxyCommand that uses the %r expansion was configured. A remote attacker can trick the victim into using a specially crafted ssh command to connect to a remote server and execute arbitrary OS commands on the system.
This vulnerability affects ssh client command and does not affect the sshd daemon.
11) Improper authorization (CVE-ID: CVE-2026-24734)
CWE-ID: CWE-285 - Improper Authorization
CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass authorization checks.
The vulnerability exists due to incomplete OCSP verification checks. When using an OCSP responder, Tomcat's FFM integration with OpenSSL does not complete verification or freshness checks on the OCSP response. A remote attacker can bypass certificate revocation and gain unauthorized access to the application.
12) Improper input validation (CVE-ID: CVE-2026-22016)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/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 JAXP component in Oracle GraalVM Enterprise Edition. A remote non-authenticated attacker can exploit this vulnerability to gain access to sensitive information.
13) Integer overflow (CVE-ID: CVE-2026-23865)
CWE-ID: CWE-190 - Integer overflow
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to integer overflow within the tt_var_load_item_variation_store() function when parsing HVAR/VVAR/MVAR tables in OpenType variable fonts. A remote attacker can trick the victim into opening a specially crafted file, trigger an integer overflow and read memory contents on the system.
14) Improper input validation (CVE-ID: CVE-2026-22021)
CWE-ID: CWE-20 - Improper input validation
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 non-authenticated attacker to perform service disruption.
The vulnerability exists due to improper input validation within the JSSE component in Oracle GraalVM Enterprise Edition. A remote non-authenticated attacker can exploit this vulnerability to perform service disruption.
15) Improper input validation (CVE-ID: CVE-2026-22013)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 5.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/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 JGSS component in Oracle GraalVM Enterprise Edition. A remote non-authenticated attacker can exploit this vulnerability to gain access to sensitive information.
16) Improper input validation (CVE-ID: CVE-2026-22018)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
The vulnerability exists due to improper input validation within the Libraries component in Oracle GraalVM Enterprise Edition. A remote non-authenticated attacker can exploit this vulnerability to perform service disruption.
17) Improper input validation (CVE-ID: CVE-2026-22008)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/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 Libraries component in Oracle Java SE. A remote non-authenticated attacker can exploit this vulnerability to manipulate data.
18) Improper input validation (CVE-ID: CVE-2026-34268)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 2.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local non-authenticated attacker to gain access to sensitive information.
The vulnerability exists due to improper input validation within the Security component in Oracle GraalVM Enterprise Edition. A local non-authenticated attacker can exploit this vulnerability to gain access to sensitive information.
19) Improper input validation (CVE-ID: CVE-2026-22007)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 2.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local non-authenticated attacker to gain access to sensitive information.
The vulnerability exists due to improper input validation within the Security component in Oracle GraalVM Enterprise Edition. A local non-authenticated attacker can exploit this vulnerability to gain access to sensitive information.
20) Out-of-bounds read (CVE-ID: CVE-2026-6918)
CWE-ID: CWE-125 - Out-of-bounds read
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 out-of-bounds read in Message::deserialize() and MessageBuffer::readData() when processing a crafted TCP message containing an attacker-controlled DataDescriptor._size value. A remote attacker can send a specially crafted TCP message to cause a denial of service.
The issue occurs before protocol-level validation, and no authentication, encryption, or valid JIT compilation request is required. Deployments running without TLS client authentication are affected by default.
21) Improper input validation (CVE-ID: CVE-2026-34282)
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 Networking component in Oracle GraalVM Enterprise Edition. A remote non-authenticated attacker can exploit this vulnerability to perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.