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GHSA-xp3w-r5p5-63rr

rust-openssl has undefined behavior in X509Ref::ocsp_responders for certificates with non-UTF-8 OCSP URLs

Source: GitHub Advisory Database (reviewed) High CVE-2026-42327

Packages

EcosystemPackageAffectedFixed in
crates.io openssl >= 0.9.7, < 0.10.79 0.10.79

Details

As written in the advisory (Markdown source, shown as plain text).

`X509Ref::ocsp_responders` returns OCSP responder URLs from a certificate's AIA extension as `OpensslString`, whose `Deref<Target = str>` 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.

References

External links from the advisory. They lead to third-party sites.