Resource exhaustion in Io.netty Netty-codec-http
CVE-2026-42587
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpContentDecompressor accepts a maxAllocation parameter to limit decompression buffer size and prevent decompression bomb atta…
Vulnerability class: DoS (Denial of Service)
EPSS: 0.000 (4.8th percentile) — read the EPSS interpretation.
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.
Affected products
- Io.netty Netty-codec-http — versions >= 4.2.0.Alpha1, < 4.2.13.Final, < 4.1.133.Final
- Io.netty Netty-codec-http2 — versions >= 4.2.0.Alpha1, < 4.2.13.Final, < 4.1.133.Final
- Netty — versions >= 4.2.0.Alpha1, < 4.2.13.Final, < 4.1.133.Final
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-42587?
- CVE-2026-42587 is a high-severity vulnerability in Io.netty Netty-codec-http, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-05-13.
- How severe is CVE-2026-42587?
- High severity. CVSS v3 base score is 7.5 out of 10.