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CVE-2025-24898: rust openssl ssl::select_next_proto use after free

• Severity: medium (CVSS 6.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-03 · updated 2026-06-17
• Weakness: CWE-416

Description

rust-openssl is a set of OpenSSL bindings for the Rust programming language. In affected versions `ssl::select_next_proto` can return a slice pointing into the `server` argument's buffer but with a lifetime bound to the `client` argument. In situations where the `sever` buffer's lifetime is shorter than the `client` buffer's, this can cause a use after free. This could cause the server to crash or to return arbitrary memory contents to the client. The crate`openssl` version 0.10.70 fixes the signature of `ssl::select_next_proto` to properly constrain the output buffer's lifetime to that of both input buffers. Users are advised to upgrade. In standard usage of `ssl::select_next_proto` in the callback passed to `SslContextBuilder::set_alpn_select_callback`, code is only affected if the `server` buffer is constructed *within* the callback.

Affected products

• sfackler rust-openssl: from 0.10.0, < 0.10.70

References

• https://crates.io/crates/openssl
• https://github.com/sfackler/rust-openssl/pull/2360
• https://github.com/sfackler/rust-openssl/security/advisories/GHSA-rpmj-rpgj-qmpm
• https://lists.debian.org/debian-lts-announce/2025/02/msg00009.html

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