CVE-2022-50237 — The ed25519-dalek crate before 2 for Rust allows a double public key signing fun

The ed25519-dalek crate before 2 for Rust allows a double public key signing function oracle attack. The Keypair implementation leads to a simple computation for extracting a private key.

01What is this vulnerability?

The ed25519-dalek crate before 2 for Rust allows a double public key signing function oracle attack. The Keypair implementation leads to a simple computation for extracting a private key.

02Affected products

Vendor	Product	Versions
dalek-cryptography	ed25519	dalek — 0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2025-07-28T00:00:00.000Z
• Last modified: 2025-07-28T13:56:12.178Z

09References

• rustsec.org — https://rustsec.org/advisories/RUSTSEC-2022-0093.html
• github.com — https://github.com/MystenLabs/ed25519-unsafe-libs
• crates.io — https://crates.io/crates/ed25519-dalek