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Vulnerability · Published Apr 24, 2026 · Assigned by GitHub_M

CVE-2026-41681rust-openssl: MdCtxRef::digest_final() writes past caller buffer with no length check

High 8.1

In plain English

A high-severity stack buffer overflow 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 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.1High
Exploit odds (30 days)0.4%top 70.1% 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 0.10.39 to before 0.10.78, EVP_DigestFinal() always writes EVP_MD_CTX_size(ctx) to the out buffer. If out is smaller than that, MdCtxRef::digest_final() writes past its end, usually corrupting the stack. This is reachable from safe Rust. This vulnerability is fixed in 0.10.78.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12rust-opensslno fix listedDEBIAN-CVE-2026-41681
Debian:13rust-opensslno fix listedDEBIAN-CVE-2026-41681
Debian:14rust-openssl0.10.78-1DEBIAN-CVE-2026-41681
Ubuntu:25.10rust-opensslno fix listedUBUNTU-CVE-2026-41681
Ubuntu:26.04:LTSrust-opensslno fix listedUBUNTU-CVE-2026-41681
Ubuntu:26.10rust-opensslno fix listedUBUNTU-CVE-2026-41681

Affected products (as reported)

VendorProductVersions
rust-openssl rust-openssl >= 0.10.39, < 0.10.78

Weakness: CWE-121 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U

References