Red Hat Security Advisory: OpenShift Container Platform 4.21.31 security and extras update

Important

A flaw was found in brace-expansion. A remote attacker can exploit this vulnerability by providing specially crafted input to the expand() function, which can lead to excessive memory consumption. This can cause a denial of service (DoS) by crashing the application due to an out-of-memory error.

CWE-770 - Allocation of Resources Without Limits or Throttling

A flaw was found in the HTTP/2 protocol implementation within the Go standard library (golang.org/x/net and net/http/internal/http2). A remote attacker can exploit this vulnerability by sending a specially crafted HTTP/2 SETTINGS frame with the SETTINGS_MAX_FRAME_SIZE parameter set to zero. This malicious frame causes the transport layer to enter an infinite loop of writing CONTINUATION frames, leading to resource exhaustion and a Denial of Service (DoS) condition.

CWE-606 - Unchecked Input for Loop Condition

A flaw was found in the brace-expansion library. The `expand()` function does not apply `maxLength` when constructing comma-alternative intermediate arrays or padded sequences, allowing attacker-controlled input to exhaust memory or block the event loop, resulting in a denial of service. This issue is due to an incomplete mitigation of CVE-2026-14257.

CWE-770 - Allocation of Resources Without Limits or Throttling

A flaw was found in Browserslist, a tool for sharing browser and Node.js versions. An attacker could provide specially crafted statistics data, which the tool processes without proper validation. This improper handling of untrusted data can lead to prototype pollution, potentially causing the application to crash and resulting in a denial of service.

CWE-915 - Improperly Controlled Modification of Dynamically-Determined Object Attributes

A flaw was found in Browserslist, a configuration tool for front-end development. An attacker can exploit this vulnerability by influencing repeated query values, leading to unbounded memory growth. This issue can cause the application to consume excessive memory, resulting in an out-of-memory process crash and a Denial of Service (DoS) for affected systems.

CWE-770 - Allocation of Resources Without Limits or Throttling