CVE-2026-41676 (GCVE-0-2026-41676)

Vulnerability from cvelistv5 – Published: 2026-04-24 17:16 – Updated: 2026-04-24 17:43
VLAI
Title
rust-openssl: Deriver::derive and PkeyCtxRef::derive can overflow short buffers on OpenSSL 1.1.1
Summary
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.
Severity
7.2 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-24 17:43 UTC
CWE
  • CWE-787 - Out-of-bounds Write
  • CWE-131 - Incorrect Calculation of Buffer Size
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7790 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
rust-openssl rust-openssl Affected: >= 0.9.27, < 0.10.78
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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