Is io.netty:netty-codec-http2 affected by CVE-2026-33871?

Maven io.netty:netty-codec-http2 is affected in =4.2.0.Alpha1 <4.2.11.Final.

Is CVE-2026-33871 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.6%.

high

CVE-2026-33871

Q: Is CVE-2026-33871 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.6%.

Maven · io.netty:netty-codec-http2

Summary

Netty HTTP/2 CONTINUATION Frame Flood DoS via Zero-Byte Frame Bypass

Severity: high
EPSS: 0.6% (p44)
Also known as: GHSA-w9fj-cfpg-grvv
Published: 2026-03-26

References

https://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv
https://nvd.nist.gov/vuln/detail/CVE-2026-33871
https://github.com/netty/netty

Related advisories

CVE-2026-42587 — high · Maven/io.netty:netty-codec-http2
CVE-2025-55163 — high · Maven/io.netty:netty-codec-http2
CVE-2026-50560 — medium · Maven/io.netty:netty-codec-http2
CVE-2026-48043 — medium · Maven/io.netty:netty-codec-http2
CVE-2026-47244 — medium · Maven/io.netty:netty-codec-http2

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.