Reported

April 19, 2026

Issued

November 10, 2026

Package

openssl (crates.io)

Type

Vulnerability

Categories

• memory-exposure

Keywords

#pem #password #callback #out-of-bounds-read

Aliases

• CVE-2026-41677
• GHSA-xmgf-hq76-4vx2

References

• https://github.com/rust-openssl/rust-openssl/pull/2605

Patched

• >=0.10.78

Unaffected

• <0.9.0

Description

The *_from_pem_callback functions, such as EcKey::private_key_from_pem_callback, pass the length returned by the user's password callback to OpenSSL without checking it against the size of the buffer the callback was given. If the callback reports more bytes than the buffer holds, some OpenSSL versions read past the end of the buffer while deriving the decryption key. OpenSSL 3.x is not affected.

0.10.78 treats a returned length larger than the buffer as a failed callback.

Advisory available under CC0-1.0 license.