{"action":"Upgrade apache2 to 2.4.46-6 or later.","affected":[{"fixed":"2.4.46-6","introduced":"0"}],"component":"apache2","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:13","exploited":false,"fixed_versions":["2.4.46-6"],"id":"tcs_01M5NFGA64FHFKFJFCJB0EYYPG","modified_at":"2026-10-23T18:03:59.182761630Z","published_at":"2021-06-10T07:15:07.580Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-26691","https://security-tracker.debian.org/tracker/CVE-2021-26691"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-26691#Debian:13/apache2","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-26691"}],"summary":"In Apache HTTP Server versions 2.4.0 to 2.4.46 a specially crafted SessionHeader sent by an origin server could cause a heap overflow"}