SB2026100614 - Multiple vulnerabilities in IBM Storage Scale
Published: October 6, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 11 vulnerabilities.
1) Resource exhaustion (CVE-ID: CVE-2026-46340)
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 SCTP message reassembly in netty-transport-sctp when processing non-complete SCTP message fragments. A remote attacker can send a sequence of tiny fragmented DATA chunks that never set the complete flag to cause a denial of service.
Each stream identifier maintains its own accumulator entry, and there is no limit on fragment depth, total buffered bytes, or the number of stream identifiers tracked.
2) Input validation error (CVE-ID: CVE-2026-6790)
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:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass host-based access controls and interfere with hostname-based security decisions.
The vulnerability exists due to improper input validation in HTTP/2 and HTTP/3 server-side request handling when processing requests with mismatched :authority and Host values. A remote attacker can send a specially crafted request containing conflicting host identities to bypass host-based access controls and interfere with hostname-based security decisions.
Different layers may interpret different host values from the same request, which can affect virtual host isolation, multi-tenant routing, redirect or callback URL construction, proxy trust chains, and logging.
3) Inconsistent interpretation of HTTP requests (CVE-ID: CVE-2026-50020)
CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
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 smuggle HTTP requests.
The vulnerability exists due to inconsistent interpretation of HTTP requests in HttpObjectDecoder when parsing requests with non-CRLF control characters before the request-line. A remote attacker can send a specially crafted request to smuggle HTTP requests.
The issue can cause request-boundary confusion when a front-end component interprets the prepended bytes differently in pipelined or multiplexed transports.
4) Inconsistent interpretation of HTTP requests (CVE-ID: CVE-2026-33870)
CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
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 perform HTTP request smuggling attacks.
The vulnerability exists due to improper validation of HTTP requests within chunked transfer encoding extension values. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.
5) CRLF injection (CVE-ID: CVE-2026-41417)
CWE-ID: CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
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 additional HTTP or RTSP requests.
The vulnerability exists due to improper neutralization of CRLF sequences in DefaultHttpRequest.setUri() and DefaultFullHttpRequest.setUri() when encoding attacker-controlled URIs into request lines through HttpRequestEncoder or RtspEncoder. A remote attacker can supply a specially crafted URI containing CRLF sequences to inject additional HTTP or RTSP requests.
Exploitation requires an application to create the request object first, later modify it through setUri(), and then serialize it with HttpRequestEncoder or RtspEncoder.
6) Inconsistent interpretation of HTTP requests (CVE-ID: CVE-2026-42580)
CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to inject arbitrary HTTP requests.
The vulnerability exists due to inconsistent interpretation of HTTP requests in io.netty.handler.codec.http.HttpObjectDecoder#getChunkSize when parsing chunked HTTP requests. A remote attacker can send a specially crafted chunked request to inject arbitrary HTTP requests.
7) Inconsistent interpretation of HTTP requests (CVE-ID: CVE-2026-42581)
CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
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 perform request smuggling.
The vulnerability exists due to improper input validation in HttpObjectDecoder when processing HTTP/1.0 requests containing both Transfer-Encoding: chunked and Content-Length headers. A remote attacker can send a specially crafted HTTP/1.0 request to perform request smuggling.
Exploitation requires Netty to be deployed behind a downstream proxy or handler that trusts Content-Length over Transfer-Encoding.
8) Inconsistent interpretation of HTTP requests (CVE-ID: CVE-2026-42584)
CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to disrupt HTTP parsing integrity and availability on the connection.
The vulnerability exists due to inconsistent interpretation of HTTP responses in HttpClientCodec when processing pipelined HTTP/1.1 responses that include a 1xx response before a GET response body and a subsequent HEAD response. A remote attacker can send a specially crafted sequence of HTTP responses to disrupt HTTP parsing integrity and availability on the connection.
Exploitation requires HTTP/1.1 pipelining, a HEAD request in the pipeline, and a server response sequence that includes a 1xx response.
9) Inconsistent interpretation of HTTP requests (CVE-ID: CVE-2026-42585)
CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
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 inject arbitrary HTTP requests.
The vulnerability exists due to inconsistent interpretation of HTTP requests in HttpRequestDecoder when parsing malformed Transfer-Encoding headers. A remote attacker can send a specially crafted HTTP request with a malformed "Transfer-Encoding: chunked, identity" header to inject arbitrary HTTP requests.
Exploitation is possible in deployments where a proxy forwards such malformed requests to Netty instead of rejecting them.
10) 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.
11) Uncontrolled Memory Allocation (CVE-ID: CVE-2026-45416)
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 uncontrolled memory allocation in SslClientHelloHandler.decode() when processing a TLS ClientHello that does not fit in the first record. A remote attacker can send a specially crafted ClientHello with a large handshake length to cause a denial of service.
The issue is exposed by the commonly used SniHandler and AbstractSniHandler constructors because they disable the client hello length guard and do not schedule a handshake timeout.
Remediation
Install update from vendor's website.