Vulnerability · Published Apr 24, 2026 · Assigned by GitHub_M
CVE-2026-41678rust-openssl: Incorrect bounds assertion in aes key wrap
High 7.2
In plain English
A high-severity out-of-bounds write 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 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
rust-openssl provides OpenSSL bindings for the Rust programming language. From to before 0.10.78, aes::unwrap_key() contains an incorrect assertion: it checks that out.len() + 8 <= in_.len(), but this condition is reversed. The intended invariant is out.len() >= in_.len() - 8, ensuring the output buffer is large enough. Because of the inverted check, the function only accepts buffers at or below the minimum required size and rejects larger ones. If a smaller buffer is provided the function will write past the end of out by in_.len() - 8 - out.len() bytes, causing an out-of-bounds write from a safe public function. This vulnerability is fixed in 0.10.78.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | rust-openssl | no fix listed | DEBIAN-CVE-2026-41678 |
| Debian:13 | rust-openssl | no fix listed | DEBIAN-CVE-2026-41678 |
| Debian:14 | rust-openssl | 0.10.78-1 | DEBIAN-CVE-2026-41678 |
| Ubuntu:25.10 | rust-openssl | no fix listed | UBUNTU-CVE-2026-41678 |
| Ubuntu:26.04:LTS | rust-openssl | no fix listed | UBUNTU-CVE-2026-41678 |
| Ubuntu:26.10 | rust-openssl | no fix listed | UBUNTU-CVE-2026-41678 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| rust-openssl | rust-openssl | >= 0.10.24, < 0.10.78 |
Weakness: CWE-787 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U