CVE-2026-93572
Io.netty/netty-codec-redis: netty: redisarrayaggregator nested resp headers multiply patched preallocation limits
Description
## 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: ```java 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
INFO
Published Date :
Sept. 18, 2026, 11:17 a.m.
Last Modified :
Sept. 18, 2026, 1:18 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-93572
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update RedisArrayAggregator with enforced limits.
- Apply patches for resource exhaustion vulnerabilities.
- Monitor Redis for unusual resource consumption.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-93572.
| URL | Resource |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-93572 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2536963 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-93572 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-93572
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-93572 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-93572 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Sep. 18, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H -
New CVE Received by [email protected]
Sep. 18, 2026
Action Type Old Value New Value Added Description ## 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: ```java 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 Added CWE CWE-770 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/93xxx/CVE-2026-93572.json">CVE-2026-93572</a> Added Reference https://access.redhat.com/security/cve/CVE-2026-93572 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2536963