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Vulnerability · Published Apr 24, 2026 · Assigned by GitHub_M

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

High 8.3

In plain English

A high-severity security flaw in rust-openssl from rust-openssl. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.3High
Exploit odds (30 days)0.3%top 79.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12rust-opensslno fix listedDEBIAN-CVE-2026-41898
Debian:13rust-opensslno fix listedDEBIAN-CVE-2026-41898
Debian:14rust-openssl0.10.78-1DEBIAN-CVE-2026-41898
Ubuntu:25.10rust-opensslno fix listedUBUNTU-CVE-2026-41898
Ubuntu:26.04:LTSrust-opensslno fix listedUBUNTU-CVE-2026-41898
Ubuntu:26.10rust-opensslno fix listedUBUNTU-CVE-2026-41898

Affected products (as reported)

VendorProductVersions
rust-openssl rust-openssl >= 0.9.24, < 0.10.78

Weakness: CWE-126, CWE-130 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N

References