CVE-2026-41898 rust-openssl: Unchecked callback length in PSK/cookie trampolines leaks adjacent memory to peer
Attackers can trigger memory leaks or corruption in Rust applications using rust-openssl by exploiting unchecked callback lengths in PSK and cookie generation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41898?
CVE-2026-41898 is a high-severity memory corruption vulnerability in rust-openssl, published on 24 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-41898?
2 open source packages ship an affected version, including openssl. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
openssl crates.io | From 0.9.24 | 0.10.78 |
openssl crates.io | From 0.9.24 | 0.10.78 |
Products include Rust-Openssl Project Rust-Openssl.
How do I fix CVE-2026-41898?
Upgrade openssl to 0.10.78 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-41898 being exploited?
There is no known exploitation of CVE-2026-41898 in the wild and no public exploit code.
Other vulnerabilities in rust-openssl
- CVE-2018-20997 Use after free in openssl
- CVE-2026-41681 rust-openssl: MdCtxRef::digest_final() writes past caller buffer with no length check
- CVE-2016-10931 Improper Certificate Validation in openssl
- CVE-2026-41676 rust-openssl: Deriver::derive and PkeyCtxRef::derive can overflow short buffers on OpenSSL 1.1.1
- CVE-2026-41678 rust-openssl: Incorrect bounds assertion in aes key wrap
Sources
Also known as AZL-84606, DEBIAN-CVE-2026-41898, GHSA-hppc-g8h3-xhp3, MINI-2cxv-gvqx-8whw, MINI-3xfr-hhf8-mgg3, MINI-48g7-r9w8-84xf and 6 more.