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CVE-2026-41676 affects rust-openssl from 0.9.27 before 0.10.78. The flaw is in Deriver::derive and PkeyCtxRef::derive, which set len = buf.len() and pass that value as the in/out length parameter to OpenSSL's EVP_PKEY_derive, assuming the underlying library will honor the caller-provided buffer length. On OpenSSL 1.1.x, the implementations for X25519, X448, DH, and HKDF-extract ignore the incoming *keylen and unconditionally write the full derived secret length (for example 32 bytes, 56 bytes, or DH prime-sized output). If the Rust caller supplies a slice shorter than the actual derived output, the OpenSSL call writes past the end of the provided buffer, causing a heap or stack overflow reachable from safe Rust code. The issue does not affect OpenSSL 3.x providers for this code path because they validate the output length.
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A vulnerability in a Rust openssl dependency mentioned as addressed by upgrading dependencies in ClamAV 1.5.3; no further details are provided in the content.
A vulnerability in the Rust openssl dependency that was resolved by upgrading the dependency.
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Cross-references every affected SKU, including bundled OEM variants.
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