What’s Vulnerable › Vulnerabilities

CVE-2026-41898: rust-openssl: Unchecked callback-returned length in PSK and cookie generate trampolines can cause OpenSSL to leak adjacent memory to the network peer

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-24 · updated 2026-07-15
• Weakness: CWE-126

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.

Affected products

• rust-openssl: from 0.9.24 before 0.10.78 — fixed in 0.10.78

How to fix

Upgrade to a fixed version: rust-openssl 0.10.78. Check the vendor advisory for mitigations.

References

• https://github.com/rust-openssl/rust-openssl/commit/1d109020d98fff2fb2e45c39a373af3dff99b24c
• https://github.com/rust-openssl/rust-openssl/pull/2607
• https://github.com/rust-openssl/rust-openssl/releases/tag/openssl-v0.10.78
• https://github.com/rust-openssl/rust-openssl/security/advisories/GHSA-hppc-g8h3-xhp3

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