EUVD-2026-25587
GHSA-hppc-g8h3-xhp3
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
8Blast Radius
ecosystem impact- 368 cargo packages depend on openssl (77 direct, 291 indirect)
Ecosystem-wide dependent count for version 0.9.24.
DescriptionNVD
rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.24 to before 0.10.78, the FFI trampolines behind SslContextBuilder::set_psk_client_callback, set_psk_server_callback, set_cookie_generate_cb, and set_stateless_cookie_generate_cb forwarded the user closure's returned usize directly to OpenSSL without checking it against the &mut [u8] that was handed to the closure. This can lead to buffer overflows and other unintended consequences. This vulnerability is fixed in 0.10.78.
AnalysisAI
Buffer overflow in rust-openssl 0.9.24 through 0.10.77 allows remote unauthenticated attackers to trigger memory corruption via crafted PSK (Pre-Shared Key) or cookie callback responses. The FFI trampolines in SslContextBuilder fail to validate closure-returned buffer sizes against allocated memory regions before passing values to OpenSSL, enabling out-of-bounds writes. …
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RemediationAI
Within 24 hours: Inventory all applications and services using rust-openssl and identify those running versions 0.9.24-0.10.77. Within 7 days: Upgrade rust-openssl to version 0.10.78 or later across all affected systems and redeploy applications. …
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External POC / Exploit Code
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