Improper Input Validation Affecting rustup package, versions <1.29.0-r7
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published7 May 2026
- disclosed14 May 2026
Introduced: 7 May 2026
NewCVE-2026-42327 (opens in a new tab)How to fix?
Upgrade Wolfi rustup to version 1.29.0-r7 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream rustup package and not the rustup package as distributed by Wolfi.
See How to fix? for Wolfi relevant fixed versions and status.
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<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. This vulnerability is fixed in 0.10.79.