CVE-2026-41207 netty-incubator-codec-ohttp's HPKEContext operations may produce empty byte[] on failures
A flaw in Netty's OHTTP codec allows silent failures to produce all-zero cryptographic keys, enabling attackers to predict AEAD keys and bypass encryption.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41207?
CVE-2026-41207 is a medium-severity vulnerability in netty-incubator-codec-ohttp, published on 4 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The netty incubator codec.bhttp is a java language binary http parser. Prior to version 0.0.21.Final, HKDF_expand returns non-NULL on failure. The byte[] is filled with zeros and has no way to distinguish success from failure. Since this output is used as HKDF key material for the response AEAD, a failure silently produces an all-zero key. When EVP_HPKE_CTX_export fails it also returns an empty byte[] array filled with zeros. This byte[] feeds directly into OHttpCrypto.createResponseAEAD(...). A silent all-zero export secret would produce a deterministic, attacker-predictable AEAD key. Version 0.0.21.Final patches the issue.
Weakness: CWE-330
Which versions are affected by CVE-2026-41207?
2 open source packages ship an affected version, including io.netty.incubator:netty-incubator-codec-ohttp. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
io.netty.incubator:netty-incubator-codec-ohttp Maven | All versions | 0.0.21.Final |
io.netty.incubator:netty-incubator-codec-ohttp Maven | All versions | 0.0.21.Final |
Products include Netty Netty-Incubator-Codec-Ohttp.
How do I fix CVE-2026-41207?
Upgrade io.netty.incubator:netty-incubator-codec-ohttp to 0.0.21.Final or later.
Is CVE-2026-41207 being exploited?
There is no known exploitation of CVE-2026-41207 in the wild and no public exploit code.
Other vulnerabilities in netty-incubator-codec-ohttp
- CVE-2024-40642 Absent Input Validation in BinaryHttpParser in the netty incubator codec.bhttp
- CVE-2026-48040 netty-incubator-codec-ohttp's Incorrect Native Pointer Derivation in Pooled Direct ByteBuf Fallback Leads to Out-of-Bounds Native Memory Access
- CVE-2024-36121 netty-incubator-codec-ohttp's BoringSSLAEADContext Repeats Nonces
Sources
Also known as GHSA-f659-372h-6x3x.