{"action":"Upgrade flask to 3.1.3 or later.","affected":[{"fixed":"3.1.3","introduced":"0"}],"component":"flask","cve_ids":["CVE-2026-27205"],"ecosystem":"PyPI","epss":0.00485,"exploited":false,"fixed_versions":["3.1.3"],"ghsa_id":"GHSA-68rp-wp8r-4726","id":"tcs_01M5KF2WYVC5J2YBPAEH4WR1AM","modified_at":"2026-09-10T03:49:54.354981590Z","published_at":"2026-02-19T20:45:41Z","references":["https://osv.dev/vulnerability/GHSA-68rp-wp8r-4726","https://github.com/pallets/flask/security/advisories/GHSA-68rp-wp8r-4726","https://nvd.nist.gov/vuln/detail/CVE-2026-27205","https://github.com/pallets/flask/commit/089cb86dd22bff589a4eafb7ab8e42dc357623b4","https://github.com/pallets/flask","https://github.com/pallets/flask/releases/tag/3.1.3"],"severity":{"label":"low"},"sources":[{"source":"osv","source_id":"GHSA-68rp-wp8r-4726","url":"https://osv.dev/vulnerability/GHSA-68rp-wp8r-4726"}],"summary":"Flask session does not add `Vary: Cookie` header when accessed in some ways"}