CVE-2026-93572

A flaw was found in Netty's RedisArrayAggregator component. A remote attacker can exploit this vulnerability by sending specially crafted nested Redis (RESP) array headers. This can cause the RedisArrayAggregator to eagerly preallocate a large amount of heap memory, leading to heap memory exhaustion and a Denial of Service (DoS) for applications using RedisDecoder with RedisArrayAggregator on untrusted traffic.

A flaw was found in Netty's RedisArrayAggregator component. A remote attacker can exploit this vulnerability by sending specially crafted nested Redis (RESP) array headers. This can cause the RedisArrayAggregator to eagerly preallocate a large amount of heap memory, leading to heap memory exhaustion and a Denial of Service (DoS) for applications using RedisDecoder with RedisArrayAggregator on untrusted traffic.

Summary

RedisArrayAggregator recently added maxElements and maxNestedArrayDepth limits to fix public Redis resource-exhaustion advisories. The limits are independent, but the allocator remains eager: every positive nested RESP array header creates new ArrayList<RedisMessage>(length) before any child element exists.

With the default constructor, an attacker can send nested array headers with length 1,000,000 until the default nesting limit of 1024 is reached. This can reserve up to 1,024,000,000 child slots from roughly 12 KB of RESP input. This is backing capacity, not logical list size: ArrayList(int) constructs an empty list with the specified initial capacity.

Technical Details

Current decodeRedisArrayHeader(...) checks the two limits independently:

if (header.length() > maxElements) {
    throw new CodecException("this codec doesn't support longer length than " + maxElements);
}

if (depths.size() >= maxNestedArrayDepth) {
    releaseAndClearDepths();
    throw new CodecException("max nested array depth exceeded: "  + maxNestedArrayDepth);
}
depths.push(new AggregateState((int) header.length()));

AggregateState i

A flaw was found in Netty's RedisArrayAggregator component. A remote attacker can exploit this vulnerability by sending specially crafted nested Redis (RESP) array headers. This can cause the RedisArrayAggregator to eagerly preallocate a large amount of heap memory, leading to heap memory exhaustion and a Denial of Service (DoS) for applications using RedisDecoder with RedisArrayAggregator on untrusted traffic.

A flaw was found in Netty's RedisArrayAggregator component. A remote attacker can exploit this vulnerability by sending specially crafted nested Redis (RESP) array headers. This can cause the RedisArrayAggregator to eagerly preallocate a large amount of heap memory, leading to heap memory exhaustion and a Denial of Service (DoS) for applications using RedisDecoder with RedisArrayAggregator on untrusted traffic.

A flaw was found in Netty's RedisArrayAggregator component. A remote attacker can exploit this vulnerability by sending specially crafted nested Redis (RESP) array headers. This can cause the RedisArrayAggregator to eagerly preallocate a large amount of heap memory, leading to heap memory exhaustion and a Denial of Service (DoS) for applications using RedisDecoder with RedisArrayAggregator on untrusted traffic.

These are all security issues fixed in the netty-4.1.138-1.1 package on the GA media of openSUSE Tumbleweed.

This update for netty, netty-tcnative fixes the following issues:

• CVE-2026-59902: Netty: Memory Exhaustion in SctpMessageCompletionHandler (bsc#1275501).
• CVE-2026-59903: Netty Vulnerable to Cache Poisoning and Information Disclosure via CORS Vary Header Overwrite (bsc#1275500).
• CVE-2026-62243: TLS hostname verification bypass in Netty OpenSSL client path (bsc#1276455).
• CVE-2026-62380: null byte and CRLF injection in Socks4ClientEncoder and Socks5ClientEncoder (bsc#1276456).
• CVE-2026-75595: fragmented TLS ClientHello causes fallback to default SslContext and allows for SNI routing and mTLS requirement bypass (bsc#1276420).
• CVE-2026-75596: fragmented ClientHellorecords can trigger quadratic pre-handshake reassembly in default SNI parsing (bsc#1276421).
• CVE-2026-76816: missing input validation in MqttEncoder allows for null-byte injection, topic hijacking, and ACL bypassing (bsc#1277243).
• CVE-2026-89044: HTTP request smuggling in Netty via improper validation of final Transfer-Encoding coding (bsc#1280048).
• CVE-2026-93488: Denial of Service via unbounded concurrent SPDY streams (bsc#1282084).
• CVE-2026-93491: Denial of Service via unbounded HttpServerCodec HTTP/1.1 pipeline queue (bsc#1282085).
• CVE-2026-93492: HTTP/2 HpackEncoder DoS with large table size (bsc#1282132).
• CVE-2026-93493: missing nextUpdate field in OCSP responses leads to silent validation bypass (bsc#1281431).
• CVE-2026-93494: ByteBuf Leak in StompSubframeDecoder When a Frame Body Is Never Terminated (bsc#1282506).
• CVE-2026-93558: Unbounded Per-Connection Queue Growth in WebSocketServerExtensionHandler Leads to Denial of Service (bsc#1282140).
• CVE-2026-93560: STOMP codec content-length long-to-int truncation causes infinite decode loop DoS (bsc#1282141).
• CVE-2026-93562: Incomplete validation of malformed Transfer-Encoding allows HTTP request smuggling (bsc#1282362).
• CVE-2026-93563: unbounded multi-line response accumulation in SmtpResponseDecoder leads to memory exhaustion and a DoS (bsc#1281432).
• CVE-2026-93564: HAProxy PROXY-v2 nested-TLV grandchild ByteBuf reference-count leak (bsc#1282363).
• CVE-2026-93565: RtspDecoder Method-Token Smuggling via Trailing Control Byte (bsc#1282364).
• CVE-2026-93566: HTTP Request Smuggling due to control characters in the chunk-size line (bsc#1282366).
• CVE-2026-93567: HTTP/1 authority-form CONNECT is translated to malformed HTTP/2 CONNECT with Host-controlled :authority (bsc#1282367).
• CVE-2026-93568: HTTP/2 and HTTP/3 Extended CONNECT requests are downgraded as regular CONNECT requests (bsc#1282370).
• CVE-2026-93569: HTTP/1 absolute-form Host mismatch is translated to HTTP/2 :authority, overriding the request-target authority (bsc#1282372).
• CVE-2026-93572: multiplication of patched preallocation limits in RedisArrayAggregator nested RESP headers can lead to denial of service (bsc#1281433).
• CVE-2026-93573: Incomplete validation of malformed Transfer-Encoding allows HTTP request smuggling (bsc#1282373).
• CVE-2026-93574: HTTP request smuggling via post-digit whitespace in chunk-size parsing (bsc#1282374).
• CVE-2026-93575: missing validations in the MqttDecoder can lead to excessive resource consumption and a DoS (bsc#1281434).
• CVE-2026-93576: netty-codec-smtp -- SMTP command-name field is not CRLF-validated (bsc#1282507).
• CVE-2026-93578: missing Extended Key Usage (EKU) check in OCSP client allows certificate revocation bypass (bsc#1281435).
• CVE-2026-93579: HTTP/2 header field values are not validated by default (bsc#1282378).

Changes for netty:

• Upgrade to upstream version 4.1.138

Changes for netty-tcnative:

• Upgrade to version 2.0.84 Final