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High severityGHSA Advisory· Published May 14, 2026· Updated Jun 17, 2026

CVE-2026-42327

CVE-2026-42327

Description

rust-openssl provides OpenSSL bindings for the Rust programming language. From 0.9.7 to before 0.10.79, X509Ref::ocsp_responders returns OCSP responder URLs from a certificate's AIA extension as OpensslString, whose Deref wraps the raw bytes with str::from_utf8_unchecked. OpenSSL does not enforce that the underlying IA5String is ASCII, so a certificate with non-UTF-8 bytes in its OCSP accessLocation causes safe Rust code to construct a &str that violates the UTF-8 invariant — resulting in undefined behavior. This vulnerability is fixed in 0.10.79.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
opensslcrates.io
>= 0.9.7, < 0.10.790.10.79

Affected products

43

Patches

Vulnerability mechanics

References

3

News mentions

0

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