SB20260831124 - Multiple vulnerabilities in Red Hat OpenShift Container Platform 4.20
Published: August 31, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 8 vulnerabilities.
1) CRLF injection (CVE-ID: CVE-2026-12143)
CWE-ID: CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
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 inject arbitrary data in server response.
The vulnerability exists due to insufficient validation of attacker-supplied data. A remote attacker can pass specially crafted data to the application containing CR-LF characters and modify application behavior.
2) Information disclosure (CVE-ID: CVE-2026-40895)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
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 exposure of sensitive information in the redirect handling logic in index.js when following cross-domain redirects. A remote attacker can cause a request to be redirected to an attacker-controlled domain to disclose sensitive information.
Custom authentication headers such as API keys or auth tokens may be forwarded to the redirect target, while only authorization, proxy-authorization, and cookie headers are stripped.
3) Uncontrolled Memory Allocation (CVE-ID: CVE-2026-42154)
CWE-ID: CWE-789 - Uncontrolled Memory Allocation
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 memory allocation with excessive size value in the remote read endpoint (/api/v1/read) when processing snappy-compressed request bodies. A remote attacker can send a specially crafted request body to cause a denial of service.
Concurrent exploitation can exhaust available memory and crash the Prometheus process.
4) Cross-site scripting (CVE-ID: CVE-2026-42338)
CWE-ID: CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
The vulnerability allows a remote attacker to execute arbitrary script in a victim\'s browser.
The vulnerability exists due to cross-site scripting in Address6.group(), Address6.link(), and AddressError.parseMessage handling when rendering untrusted Address6 input or related HTML output as HTML. A remote attacker can supply crafted input or option values to inject script and execute arbitrary script in a victim\'s browser.
User interaction is required because a victim application must render the returned HTML or parseMessage as HTML.
5) Use of uninitialized resource (CVE-ID: CVE-2026-45736)
CWE-ID: CWE-908 - Use of Uninitialized Resource
CVSSv4: 5.9 [CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to use of uninitialized resource in websocket.close() when processing a TypedArray passed as the reason argument. A remote privileged user can pass a crafted TypedArray as the close reason to disclose sensitive information.
The issue is only exploitable through misuse that is unlikely in practice.
6) Resource exhaustion (CVE-ID: CVE-2026-59869)
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 the js-yaml parser when parsing YAML documents containing chained merge keys. A remote attacker can send a specially crafted YAML document to cause a denial of service.
The issue results in quadratic CPU consumption for input whose size grows only linearly.
7) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2026-59873)
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 allocation of resources without limits or throttling in the Unpack stream in src/extract.ts when extracting crafted compressed tar archives. A remote attacker can send a specially crafted archive to cause a denial of service.
The issue can exhaust disk space and CPU through decompression and parsing of highly compressible input.
8) Command Injection (CVE-ID: CVE-2026-9277)
CWE-ID: CWE-77 - Command injection
CVSSv4: 9.2 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to execute arbitrary commands on the system.
The vulnerability exists due to shell-quote's `quote()` function did not validate object-token inputs against the operator model used by `parse()`.. A remote attacker can pass specially crafted data to the application and execute arbitrary commands.
Remediation
Install update from vendor's website.