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Duplicate Advisory: curve25519-dalek has timing variability in `curve25519-dalek`'s `Scalar29::sub`/`Scalar52::sub`

Low severity GitHub Reviewed Published Jul 27, 2025 to the GitHub Advisory Database • Updated Jul 28, 2025
Withdrawn This advisory was withdrawn on Jul 28, 2025

Package

cargo curve25519-dalek (Rust)

Affected versions

< 4.1.3

Patched versions

4.1.3

Description

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-x4gp-pqpj-f43q. This link is maintained to preserve external references.

Original Description

The curve25519-dalek crate before 4.1.3 for Rust has a constant-time operation on elliptic curve scalars that is removed by LLVM.

References

Published by the National Vulnerability Database Jul 27, 2025
Published to the GitHub Advisory Database Jul 27, 2025
Reviewed Jul 28, 2025
Withdrawn Jul 28, 2025
Last updated Jul 28, 2025

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS score

Weaknesses

Compiler Optimization Removal or Modification of Security-critical Code

The developer builds a security-critical protection mechanism into the software, but the compiler optimizes the program such that the mechanism is removed or modified. Learn more on MITRE.

CVE ID

No known CVE

GHSA ID

GHSA-4hff-hh47-7788

Source code

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