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The `rsa` crate is an RSA implementation written in rust. Prior to version 0.9.10, when creating a RSA private key from its components, the construction panics instead of returning an error when one of the primes is `1`. Version 0.9.10 fixes the issue.

CVE-2026-21895 identifies a vulnerability in the RustCrypto RSA crate, a Rust language implementation of RSA cryptography. The flaw is related to improper handling of exceptional conditions during RSA private key construction from its prime components. Specifically, in versions before 0.9.10, if one of the primes is set to 1, the constructor panics (causing a runtime crash) instead of returning a controlled error. This behavior is classified under CWE-703, which concerns improper checks or handling of exceptional conditions. The panic can lead to denial-of-service (DoS) scenarios where applications relying on this crate may unexpectedly terminate or become unstable when processing malformed or maliciously crafted key components. However, this vulnerability does not affect the cryptographic strength or confidentiality of RSA keys, as it does not allow key extraction or cryptographic bypass. The issue was addressed in version 0.9.10 by ensuring that invalid prime inputs are properly rejected with error returns rather than panics. The CVSS 4.0 score of 2.7 reflects a low-severity issue with network attack vector, no privileges or user interaction required, and limited impact confined to availability (denial of service). No known exploits have been reported in the wild, indicating limited active threat. The vulnerability is relevant for developers and organizations using the RustCrypto RSA crate in their software, especially those constructing RSA keys dynamically or from external inputs.

Detailed information about CVE-2026-21895: CWE-703: Improper Check or Handling of Exceptional Conditions in RustCrypto RSA affecting RustCrypto RSA. Get real-ti

CVE-2026-21895: CWE-703: Improper Check or Handling of Exceptional Conditions in RustCrypto RSA - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-21895: CWE-703: Improper Check or Handling of Exceptional Conditions in RustCrypto RSA

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