Vulnerability MediumRUSTSEC-2023-0022 · openssl
RUSTSEC-2023-0022: `openssl` `X509NameBuilder::build` returned object is not thread safe
Short answerA security vulnerability in the openssl crate: `openssl` `X509NameBuilder::build` returned object is not thread safe. GitHub rates it Medium. Fixed in 0.10.48: update to a fixed version.
| Crate | openssl |
|---|---|
| Type | Vulnerability (thread-safety) |
| Affected versions | Before 0.10.48. |
| Fixed in | 0.10.48 |
| Severity | Medium (GitHub rating) |
| Published | 2023-03-24 |
| Last changed | 2023-11-08 |
| Also known as | GHSA-3gxf-9r58-2ghg |
| Affected functions | openssl::x509::X509NameBuilder::build |
What to do
- See which version you have:
cargo tree -i openssl(it also shows which of your dependencies pulls it in). - Update within your version requirement:
cargo update -p openssl. If the fix is a newer major or minor than your requirement allows, raise it in Cargo.toml (for exampleopenssl = "0.10.48") or update the dependency that pulls it in. - Check again with
cargo audit, or paste your Cargo.lock into our Cargo.toml checker.
Details from the advisory
OpenSSL has a modified bit that it can set on on X509_NAME objects. If this bit is set then the object is not thread-safe even when it appears the code is not modifying the value.
Thanks to David Benjamin (Google) for reporting this issue.
References
- Package: crates.io/crates/openssl
- Advisory: rustsec.org/advisories/RUSTSEC-2023-0022.html
- Web: github.com/sfackler/rust-openssl/pull/1854
From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.
Other advisories for openssl
- Vulnerability HighRUSTSEC-2016-0001 · 2016-11-05SSL/TLS MitM vulnerability due to insecure defaults
- Vulnerability CriticalRUSTSEC-2018-0010 · 2018-06-01Use after free in CMS Signing
- VulnerabilityRUSTSEC-2023-0023 · 2023-03-24`openssl` `SubjectAlternativeName` and `ExtendedKeyUsage::other` allow arbitrary file read
- VulnerabilityRUSTSEC-2023-0024 · 2023-03-24`openssl` `X509Extension::new` and `X509Extension::new_nid` null pointer dereference
- VulnerabilityRUSTSEC-2023-0044 · 2023-06-20`openssl` `X509VerifyParamRef::set_host` buffer over-read
- UnsoundRUSTSEC-2023-0072 · 2023-11-23`openssl` `X509StoreRef::objects` is unsound
- VulnerabilityRUSTSEC-2024-0357 · 2024-07-21`MemBio::get_buf` has undefined behavior with empty buffers
- VulnerabilityRUSTSEC-2025-0004 · 2025-02-02ssl::select_next_proto use after free
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