netty-incubator-codec-ohttp's HPKEContext operations may produce empty byte[] on failures
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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-41207US | medium5.3OT elevated | — | ||
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 h… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/netty/netty-incubator-codec-ohttpPACKAGE
- https://github.com/netty/netty-incubator-codec-ohttp/commit/3d3b4e527fc82ad0fe3db1af951ffd0ec9a10680WEB
- https://github.com/netty/netty-incubator-codec-ohttp/security/advisories/GHSA-f659-372h-6x3xWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-41207ADVISORY
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