{"action":"Upgrade aiosmtplib to 5.1.2 or later.","affected":[{"fixed":"5.1.2","introduced":"0"}],"component":"aiosmtplib","cve_ids":["CVE-2026-55558"],"ecosystem":"PyPI","epss":0.00403,"exploited":false,"fixed_versions":["5.1.2"],"ghsa_id":"GHSA-vxj7-4xrp-5vr4","id":"tcs_01M5KH7WJB346EQFSM5P8QV5XW","modified_at":"2026-09-10T12:15:06.298327536Z","published_at":"2026-09-10T09:44:57.851407Z","references":["https://osv.dev/vulnerability/PYSEC-2026-3805","https://github.com/cole/aiosmtplib/security/advisories/GHSA-vxj7-4xrp-5vr4","https://nvd.nist.gov/vuln/detail/CVE-2026-55558","https://github.com/cole/aiosmtplib/commit/9fab7ba1361dbf7622ede1315a24be805cff09c9","https://github.com/cole/aiosmtplib","https://github.com/cole/aiosmtplib/releases/tag/v5.1.2","https://pypi.org/project/aiosmtplib","https://github.com/advisories/GHSA-vxj7-4xrp-5vr4"],"severity":{"label":"medium","score":5.9},"sources":[{"source":"osv","source_id":"PYSEC-2026-3805","url":"https://osv.dev/vulnerability/PYSEC-2026-3805"}],"summary":"aiosmtplib: STARTTLS response injection"}