Vulnerability/
https://seclists.org/oss-sec/2026/q3/628

https://seclists.org/oss-sec/2026/q3/628: Fwd: [Announce] Libgcrypt 1.12.3 leased

Published Aug 31, 2026

Updated

Affected Software

1 affected component

gnupg Libgcrypt=1.12.3

Frequently Asked Questions

What must an attacker control to trigger the failure?

The attacker must be able to supply a degenerate or small-order Ed25519 public key to Libgcrypt's Ed25519 signature-verification path. The point passes the initial on-curve check but reaches a fatal internal arithmetic assertion during scalar multiplication.

What is the practical impact?

The reported behavior is a fatal log_bug condition, so the issue can cause a denial of service in software that performs verification using an attacker-supplied Ed25519 public key.

Which release includes the fix?

The announcement identifies Libgcrypt 1.12.3 as released and states that this issue, tracked as T8380, was fixed.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.