Vulnerability Details CVE-2026-41207
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 9.2%
CVSS Severity
CVSS v3 Score 5.3
References
Products affected by CVE-2026-41207
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.1
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.10
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.11
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.12
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.13
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.14
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.15
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.16
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.17
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.18
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.19
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.2
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.3
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.4
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.5
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.6
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.7
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.8
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cpe:2.3:a:netty:netty-incubator-codec-ohttp:0.0.9