Is openssl affected by CVE-2026-42327?

crates.io openssl is affected in >=0.9.7 <0.10.79.

Is CVE-2026-42327 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

high

CVE-2026-42327

Q: Is CVE-2026-42327 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

crates.io · openssl

Summary

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

Severity: high
EPSS: 0.2% (p11)
Also known as: GHSA-xp3w-r5p5-63rr
Published: 2026-05-05

References

Related advisories

CVE-2018-16395 — critical · RubyGems/openssl
CVE-2026-41676 — high · crates.io/openssl
CVE-2026-41678 — high · crates.io/openssl
CVE-2026-41681 — high · crates.io/openssl
CVE-2026-41898 — high · crates.io/openssl
GHSA-9qwg-crg9-m2vc — high · crates.io/openssl
GHSA-6hcf-g6gr-hhcr — high · crates.io/openssl
CVE-2017-14033 — high · RubyGems/openssl

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.