{"action":"Upgrade glewlwyd to 2.5.2-3 or later.","affected":[{"fixed":"2.5.2-3","introduced":"0"}],"component":"glewlwyd","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["2.5.2-3"],"id":"tcs_01M5NFZHXFXWM4RG47WMK66J3P","modified_at":"2026-10-23T18:03:33.970828918Z","published_at":"2021-09-08T22:15:11.383Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-40818","https://security-tracker.debian.org/tracker/CVE-2021-40818"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-40818","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-40818"}],"summary":"scheme/webauthn.c in Glewlwyd SSO server through 2.5.3 has a buffer overflow during FIDO2 signature validation in webauthn registration."}