{"answers":{"affected":"3 open source packages ship an affected version, including github.com/tinyauthapp/tinyauth and github.com/steveiliop56/tinyauth.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77561 exists.","fix":"Upgrade github.com/tinyauthapp/tinyauth to 1.0.1-0.20260715123057-dade1e2c8f27 or later.","what":"CVE-2026-77561 is a medium-severity denial of service vulnerability in tinyauthapp tinyauth, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-77561 and fix it if it is affected.\n\nWhat it is: CVE-2026-77561 is a medium-severity denial of service vulnerability in tinyauthapp tinyauth, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77561 exists.\n\nAffected packages and fixed versions:\n- github.com/tinyauthapp/tinyauth (Go): affected all versions; fixed in 1.0.1-0.20260715123057-dade1e2c8f27\n- github.com/steveiliop56/tinyauth (Go): affected all versions; fixed in 1.0.1-0.20260715123057-dade1e2c8f27\n- github.com/steveiliop56/tinyauth (Go): affected all versions; fixed in 1.0.1-0.20260715123057-dade1e2c8f27\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-77561/ (Markdown: https://insights.sbomify.com/CVE-2026-77561/index.md)","id":"CVE-2026-77561","markdown":"https://insights.sbomify.com/CVE-2026-77561/index.md","name":"CVE-2026-77561","record":{"aliases":["GHSA-9xhm-w3wj-xhqh","GO-2026-6564"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Tinyauth authentication server","requires_auth":"none","summary":"Unauthenticated attackers can trigger a global login lockdown in Tinyauth, denying service to valid users by exhausting login attempt records.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-307","name":"Improper Restriction of Excessive Authentication Attempts"}],"description":"Tinyauth is an authentication and authorization server. Prior to 5.1.0, an unauthenticated remote attacker can send POST /api/user/login requests with 257 distinct nonexistent usernames to fill MaxLoginAttemptRecords and activate a global login lockdown. internal/controller/user_controller.go loginHandler passes each attacker-controlled identifier to internal/service/auth_service.go RecordLoginAttempt, which invokes lockdownMode after the map reaches its cap. IsAccountLocked checks that global state before validating unrelated accounts, causing valid users to receive HTTP 429 until auth.loginTimeout expires, approximately 300 seconds by default. The attack can be repeated, but existing authenticated sessions are not invalidated. This issue is fixed in version 5.1.0.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Tinyauth: Unauthenticated login attempts can trigger global login lockdown denial of service","id":"CVE-2026-77561","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":6,"next":{"headline":"Talos Linux: Support bundle does not redact registry credentials","id":"CVE-2026-77564"},"packages":[{"ecosystem":"Go","fixed":["1.0.1-0.20260715123057-dade1e2c8f27"],"introduced":["0"],"last_affected":[],"package":"github.com/steveiliop56/tinyauth","purl":null,"source":"GHSA-9xhm-w3wj-xhqh"},{"ecosystem":"Go","fixed":["1.0.1-0.20260715123057-dade1e2c8f27"],"introduced":["0"],"last_affected":[],"package":"github.com/steveiliop56/tinyauth","purl":"pkg:golang/github.com/steveiliop56/tinyauth","source":"GHSA-9xhm-w3wj-xhqh"},{"ecosystem":"Go","fixed":["1.0.1-0.20260715123057-dade1e2c8f27"],"introduced":["0"],"last_affected":[],"package":"github.com/tinyauthapp/tinyauth","purl":"pkg:golang/github.com/tinyauthapp/tinyauth","source":"GO-2026-6564"}],"prev":{"headline":"Tinyauth: forward-auth per-app ACL is matched case-sensitively against the (case-insensitive) hostname, letting an authenticated user reach apps they are not on the allowlist for","id":"CVE-2026-77560"},"products":["tinyauth"],"published":"2026-09-21","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-24","vendors":["tinyauthapp"]},"summary":"Unauthenticated attackers can trigger a global login lockdown in Tinyauth, denying service to valid users by exhausting login attempt records.","url":"https://insights.sbomify.com/CVE-2026-77561/"}