Vulnerability in Rust-Openssl
CVE-2026-41898
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (18.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Rust-Openssl — versions >= 0.9.24, < 0.10.78
- Rust-Openssl Project
Weakness classification (CWE)
References
- github.com/rust-openssl/rust-openssl/security/advisories/GHSA-hppc-g8h3-xhp3 (Vendor Advisory)
- github.com/rust-openssl/rust-openssl/pull/2607 (Issue Tracking)
- github.com/rust-openssl/rust-openssl/commit/1d109020d98fff2fb2e45c39a373af3dff9… (Patch)
- github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78 (Release Notes)
Frequently asked questions
- What is CVE-2026-41898?
- CVE-2026-41898 is a medium-severity vulnerability in Rust-Openssl, classified under Buffer Over-read. CVSS score: 5.3/10. Published 2026-04-24.
- How severe is CVE-2026-41898?
- Medium severity. CVSS v3 base score is 5.3 out of 10.