Buffer overflow in Rust-Openssl
CVE-2026-45784
rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.10.50 until 0.10.80, CipherCtxRef::cipher_update_inplace in openssl/src/cipher_ctx.rs 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 issue is fixed in version 0.10.80.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.001 (2.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 2.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: 0.000
Affected products
- Rust-Openssl — versions >= 0.10.50, < 0.10.80
- Sfackler OpenSSL
Weakness classification (CWE)
References
- github.com/rust-openssl/rust-openssl/security/advisories/GHSA-phqj-4mhp-q6mq (Vendor Advisory)
- github.com/rust-openssl/rust-openssl/pull/2638 (Patch, Issue Tracking)
- github.com/rust-openssl/rust-openssl/commit/19eceb26f2404aae187e5444e65c404ebc1… (Patch)
- github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.80 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-45784?
- CVE-2026-45784 is a high-severity vulnerability in Rust-Openssl, classified under Incorrect Calculation of Buffer Size. CVSS score: 7.1/10. Published 2026-07-17.
- How severe is CVE-2026-45784?
- High severity. CVSS v3 base score is 7.1 out of 10.