Resource exhaustion in Netty
CVE-2026-59902
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, io.netty.handler.codec.sctp.SctpMessageCompletionHandler limits incomplete messages and fragment counts but not maxBufferedBytes, allowing unauthenticated peers to exhaust memory with large SCTP fragments. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (50.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Netty — versions < 4.1.137.Final, >= 4.2.0.Final, < 4.2.17.Final
Weakness classification (CWE)
References
- github.com/netty/netty/security/advisories/GHSA-2qj4-mmr9-4v2f (Vendor Advisory)
- github.com/netty/netty/pull/17213 (Patch, Issue Tracking)
- github.com/netty/netty/pull/17217 (Patch, Issue Tracking)
- github.com/netty/netty/commit/1b5abc6443b63726c72cdd285af2feb7ddbb8ff7 (Patch)
- github.com/netty/netty/releases/tag/netty-4.1.137.Final (Release Notes)
- github.com/netty/netty/releases/tag/netty-4.2.17.Final (Release Notes)
Frequently asked questions
- What is CVE-2026-59902?
- CVE-2026-59902 is a high-severity vulnerability in Netty, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-08-17.
- How severe is CVE-2026-59902?
- High severity. CVSS v3 base score is 7.5 out of 10.