EUVD-2026-30482
GHSA-xv59-967r-8726
Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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
4DescriptionGitHub Advisory
CipherCtxRef::cipher_update, CipherCtxRef::cipher_update_vec, and symm::Crypter::update incorrectly sized output buffers when used with AES key-wrap-with-padding ciphers (EVP_aes_{128,192,256}_wrap_pad). For a non-multiple-of-8 input, OpenSSL writes up to 7 bytes past the end of the caller's buffer or Vec, producing attacker-controllable heap corruption when the plaintext length is attacker-influenced.
This only impacts users using AES key-wrap-with-padding ciphers.
AnalysisAI
Heap buffer overflow in rust-openssl's AES key-wrap-with-padding cipher functions allows attackers to write up to 7 bytes past allocated buffer boundaries when processing non-multiple-of-8 plaintext inputs, enabling attacker-controlled heap corruption. Affected versions 0.10.0 through 0.10.78 are vulnerable when CipherCtxRef::cipher_update, CipherCtxRef::cipher_update_vec, or symm::Crypter::update are used with EVP_aes_128/192/256_wrap_pad ciphers.
Technical ContextAI
rust-openssl wraps OpenSSL's EVP cipher interface, exposing AES key-wrap-with-padding ciphers (EVP_aes_128/192/256_wrap_pad) via CipherCtxRef and symm::Crypter APIs. The vulnerability stems from incorrect output buffer allocation logic in these wrapper functions - OpenSSL's key-wrap padding mechanism requires output buffers sized to handle non-standard length requirements, but rust-openssl miscalculates required output size for non-multiple-of-8 inputs. When the underlying OpenSSL EVP_EncryptUpdate writes output, it extends beyond the undersized buffer, causing heap overflow (CWE-122: Heap-based Buffer Overflow). The issue is specific to padded key-wrap ciphers; standard AES modes and unpadded key-wrap are unaffected.
RemediationAI
Upgrade rust-openssl to version 0.10.79 or later immediately. This can typically be done by updating the Cargo.toml dependency to openssl = "0.10.79" or higher and running cargo update. No workarounds exist for versions prior to 0.10.79 if AES key-wrap-with-padding ciphers are in use; affected code paths must be disabled or removed entirely. If upgrading is not immediately feasible, the only mitigation is to refrain from using EVP_aes_128_wrap_pad, EVP_aes_192_wrap_pad, or EVP_aes_256_wrap_pad ciphers until the patch is applied. Validate that input plaintext length is always a multiple of 8 bytes as a temporary compensating control, though this does not fully eliminate the heap corruption risk if the underlying OpenSSL behavior changes. See vendor advisory at https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-xv59-967r-8726 for additional details.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Heap Overflow
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External POC / Exploit Code
Leaving vuln.today