CVE-2026-41677 rust-openssl: Out-of-bounds read in PEM password callback when user callback returns an oversized length
An out-of-bounds read in rust-openssl allows attackers to read memory or cause crashes via oversized password callback returns.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41677?
CVE-2026-41677 is a low-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 0.9.0 to before 0.10.78, the *_from_pem_callback APIs did not validate the length returned by the user's callback. A password callback that returns a value larger than the buffer it was given can cause some versions of OpenSSL to over-read this buffer. OpenSSL 3.x is not affected by this. This vulnerability is fixed in 0.10.78.
Which versions are affected by CVE-2026-41677?
2 open source packages ship an affected version, including openssl. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
openssl crates.io | From 0.9.0 | 0.10.78 |
openssl crates.io | From 0.9.0 | 0.10.78 |
Products include Rust-Openssl Project Rust-Openssl.
How do I fix CVE-2026-41677?
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-2026-41677 being exploited?
There is no known exploitation of CVE-2026-41677 in the wild and no public exploit code.
Other vulnerabilities in rust-openssl
- CVE-2018-20997 Use after free in openssl
- CVE-2026-41898 rust-openssl: Unchecked callback length in PSK/cookie trampolines leaks adjacent memory to peer
- 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
Sources
Also known as AZL-83621, DEBIAN-CVE-2026-41677, GHSA-xmgf-hq76-4vx2, MINI-25h5-3584-hvjm, MINI-28gj-w9c7-6jfw, MINI-49wx-842g-786p and 6 more.