Medium [CVE-2026-45784] Heap Corruption from Incorrect Buffer Sizing
This medium-severity Red Hat Linux advisory covers CVE-2026-45784.
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Summary
rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.10.50 until 0.10.80, CipherCtxRef::cipher_update_inplace in openssl/src/cipher_ctx.rs incorrectly sized output buffers when used with AES key-wrap-with-padding ciphers EVP_aes_{128,192,256}_wrap_pad.
For a non-multiple-of-8 input, OpenSSL writes up to 7 bytes past the end of the caller's buffer or Vec, producing attacker-controllable heap corruption when the plaintext length is attacker-influenced. This issue is fixed in version 0.10.80.
When processing data with AES key-wrap-with-padding ciphers, the library incorrectly calculates the size of output buffers. This error can lead to memory corruption, where OpenSSL writes beyond the intended buffer boundaries.
An attacker capable of influencing the input data's length could exploit this to cause a denial of service or potentially corrupt data. This Moderate flaw in `rust-openssl` can lead to heap corruption when processing data with AES key-wrap-with-padding ciphers.
An attacker able to influence the plaintext length could trigger an out-of-bounds write, potentially causing a denial of service or data integrity issues. Exploitation requires the use of these specific ciphers, limiting the attack surface.
Red Hat severity: Moderate — CVSS 5.1 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L). Weakness: CWE-787.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
Mitigation
Upgrade to a fixed release: 0.10.80. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 6 days ago·verify at source
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