CVE-2026-41676— rust-openssl: Deriver::derive and PkeyCtxRef::derive can overflow short buffers on OpenSSL 1.1.1
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I. Basic Information for CVE-2026-41676
Vulnerability Information
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Vulnerability Title
rust-openssl: Deriver::derive and PkeyCtxRef::derive can overflow short buffers on OpenSSL 1.1.1
Source: NVD (National Vulnerability Database)
Vulnerability Description
rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.27 to before 0.10.78, Deriver::derive (and PkeyCtxRef::derive) sets len = buf.len() and passes it as the in/out length to EVP_PKEY_derive, relying on OpenSSL to honor it. On OpenSSL 1.1.x, X25519, X448, DH and HKDF-extract ignore the incoming *keylen, unconditionally writing the full shared secret (32/56/prime-size bytes). A caller passing a short slice gets a heap/stack overflow from safe code. OpenSSL 3.x providers do check, so this only impacts older OpenSSL. This vulnerability is fixed in 0.10.78.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
跨界内存写
Source: NVD (National Vulnerability Database)
Vulnerability Title
rust-openssl 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
rust-openssl是rust-openssl开源的一个用于与 OpenSSL 库进行交互的库。 rust-openssl 0.9.27版本至0.10.78之前版本存在安全漏洞，该漏洞源于Deriver::derive设置len = buf.len()并将其作为输入/输出长度传递给EVP_PKEY_derive，在OpenSSL 1.1.x上X25519、X448、DH和HKDF-extract忽略传入的*keylen，无条件写入完整共享密钥，导致安全代码出现堆/栈溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| rust-openssl | rust-openssl | >= 0.9.27, < 0.10.78 | - |
II. Public POCs for CVE-2026-41676
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · rust-openssl · 2026-04-24 · 5 CVEs total
| CVE-2026-41678 | rust-openssl: Incorrect bounds assertion in aes key wrap | |
| CVE-2026-41677 | rust-openssl: Out-of-bounds read in PEM password callback when user callback returns an ov | |
| CVE-2026-41681 | rust-openssl: MdCtxRef::digest_final() writes past caller buffer with no length check | |
| CVE-2026-41898 | rust-openssl: Unchecked callback-returned length in PSK and cookie generate trampolines ca |
IV. Related Vulnerabilities
Same product: rust-openssl
- CVE-2026-41898
rust-openssl: Unchecked callback-returned length in PSK and - CVE-2026-41681
rust-openssl: MdCtxRef::digest_final() writes past caller bu - CVE-2026-41678
rust-openssl: Incorrect bounds assertion in aes key wrap - CVE-2026-41677
rust-openssl: Out-of-bounds read in PEM password callback wh - CVE-2025-24898
rust openssl ssl::select_next_proto use after free
Same vendor: rust-openssl
V. Comments for CVE-2026-41676
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