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CVE-2026-41898 is a memory-safety flaw in rust-openssl, the Rust bindings for OpenSSL, affecting versions 0.9.24 through before 0.10.78. The issue is in the FFI trampolines used by SslContextBuilder::set_psk_client_callback, SslContextBuilder::set_psk_server_callback, set_cookie_generate_cb, and set_stateless_cookie_generate_cb. These trampolines passed the usize length returned by a user-supplied Rust closure directly to OpenSSL without validating that the returned length was less than or equal to the size of the mutable output buffer (&mut [u8]) provided to that closure. If the closure returns an oversized length, OpenSSL may treat bytes beyond the actual buffer as valid output, resulting in out-of-bounds reads, potential buffer overflow conditions, and unintended disclosure of adjacent memory.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.