Quick answers
- Is CVE-2026-93491 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-93491 being exploited in the wild.
- How severe is CVE-2026-93491?
- High severity, with a CVSS score of 7.5, published 18 September 2026.
- Which products and versions are affected?
- Netty Netty.
- Is there a fix for CVE-2026-93491?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-93491 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-93491?
- Check whether you run Netty. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability exists in Netty's HttpServerCodec HTTP/1.1 handler, which uses an internal methodOverflowQueue to buffer data during request pipelining. When an attacker sends multiple pipelined HTTP/1.1 requests on a single connection without triggering reads, the queue grows without bounds due to lack of size limits, causing unbounded heap memory consumption. No authentication is required; the attack is triggered by network-accessible HTTP services. A successful exploit leads to denial of service through memory exhaustion and process termination. Patches are expected to impose limits on the queue size.
Affected products
- Netty Netty
Timeline
- 2026-09-18: disclosed