CVE-2022-50237 – ed25519-dalek

Package

Manager: cargo
Name: ed25519-dalek
Vulnerable Version: >=0 <2.0.0

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS v4.0: CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

EPSS: 0.00016 pctl0.02449

Details

`ed25519-dalek` Double Public Key Signing Function Oracle Attack Versions of `ed25519-dalek` prior to v2.0 model private and public keys as separate types which can be assembled into a `Keypair`, and also provide APIs for serializing and deserializing 64-byte private/public keypairs. Such APIs and serializations are inherently unsafe as the public key is one of the inputs used in the deterministic computation of the `S` part of the signature, but not in the `R` value. An adversary could somehow use the signing function as an oracle that allows arbitrary public keys as input can obtain two signatures for the same message sharing the same `R` and only differ on the `S` part. Unfortunately, when this happens, one can easily extract the private key. Revised public APIs in v2.0 of `ed25519-dalek` do NOT allow a decoupled private/public keypair as signing input, except as part of specially labeled "hazmat" APIs which are clearly labeled as being dangerous if misused.

Metadata

Created: 2023-08-14T21:10:29Z
Modified: 2025-07-28T15:53:32Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/08/GHSA-w5vr-6qhr-36cc/GHSA-w5vr-6qhr-36cc.json
CWE IDs: ["CWE-497"]
Alternative ID: GHSA-w5vr-6qhr-36cc
Finding: F017
Auto approve: 1