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Advisory record · GHSA-9xhm-w3wj-xhqh

Tinyauth: Unauthenticated login attempts can trigger global login lockdown denial of service

CVSS 5.3 MediumEPSS 0.0060 · 48th percentile

Published by the GitHub Advisory Database at 22 Sept 2026, 20:37 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/steveiliop56/tinyauthGo<1.0.1-0.20260715123057-dade1e2c8f271.0.1-0.20260715123057-dade1e2c8f27
Identifiers
GHSA-9xhm-w3wj-xhqh · CVE-2026-77561 · GO-2026-6564
Weakness (CWE)
CWE-307
Tags
Published
22 Sept 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Tinyauth (Go module github.com/steveiliop56/tinyauth) versions before 1.0.1-0.20260715123057-dade1e2c8f27 are affected. An unauthenticated remote attacker who can reach the login endpoint can submit 257 unique nonexistent usernames, which puts the login rate limiter into a global lockdown that rejects valid logins for other users for the login timeout period (300 seconds by default). Upgrade to 1.0.1-0.20260715123057-dade1e2c8f27 or later. The source gives no workaround.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0060, the 48th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.