CVE-2026-21895: rsa crate has potential panic on a prime being equal to 1

January 6, 2026 (updated January 8, 2026)

When creating a RSA private key from its components, the construction panics, instead of returning an error, when one of the primes is 1.

Discovered by Christian Reitter from Radically Open Security during a security review for Proton AG.

References

github.com/RustCrypto/RSA
github.com/RustCrypto/RSA/commit/2926c91bef7cb14a7ccd42220a698cf4b1b692f7
github.com/RustCrypto/RSA/security/advisories/GHSA-9c48-w39g-hm26
github.com/advisories/GHSA-9c48-w39g-hm26
nvd.nist.gov/vuln/detail/CVE-2026-21895

Code Behaviors & Features

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