{"id":"CVE-2026-45068","aliases":["GHSA-xx3c-qf5g-hc39"],"url":"https://o3.security/vulnerability/CVE-2026-45068","summary":"Symfony: Argument Injection in SendmailTransport via Dash-Prefixed Recipient Address","details":"### Description\n\nSymfony Mailer selects a transport via the `MAILER_DSN` environment variable / configuration (e.g. `smtp://...`, `sendmail://...`, `native://default`). `SendmailTransport` invokes the local `sendmail` binary and supports two modes: `-bs` (speak SMTP over stdin: the default) and `-t` (read the message on stdin, pass recipients as command-line arguments).\n\nIn `-t` mode, recipient addresses are appended to the sendmail command line **without a `--` end-of-options separator**. A recipient address beginning with `-` (which `Symfony\\Component\\Mime\\Address` accepts as valid) is therefore interpreted by sendmail as a command-line option rather than an address.\n\n### Resolution\n\nThe `SendmailTransport` transport now ensure `--` is set before the list of recipients.\n\nThe patch for this issue is available [here](https://github.com/symfony/symfony/commit/c45144862dc289d03952f41f6078174089a3afc6) for branch 5.4.\n\n### Credits\n\nSymfony would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.","published":"2026-07-14T19:02:10.265Z","modified":"2026-08-12T03:51:13.851880678Z","cvss":null,"epss":{"score":0.00524,"percentile":0.43256,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"symfony/mailer","fixedVersion":"5.4.52"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"5.4.52"},{"ecosystem":"Packagist","name":"symfony/mailer","fixedVersion":"6.4.40"},{"ecosystem":"Packagist","name":"symfony/mailer","fixedVersion":"7.4.12"},{"ecosystem":"Packagist","name":"symfony/mailer","fixedVersion":"8.0.12"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"6.4.40"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"7.4.12"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"8.0.12"}],"fix":{"url":"https://github.com/symfony/symfony/commit/c45144862dc289d03952f41f6078174089a3afc6","label":"symfony/symfony@c451448"},"references":[{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v5.4.52"},{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v6.4.40"},{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v7.4.12"},{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v8.0.12"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45068.json"},{"type":"ADVISORY","url":"https://github.com/symfony/symfony/security/advisories/GHSA-xx3c-qf5g-hc39"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45068"},{"type":"FIX","url":"https://github.com/symfony/symfony/commit/c45144862dc289d03952f41f6078174089a3afc6"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/mailer/CVE-2026-45068.yaml"},{"type":"WEB","url":"https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-45068.yaml"},{"type":"PACKAGE","url":"https://github.com/symfony/symfony"},{"type":"WEB","url":"https://symfony.com/cve-2026-45068"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:13.851880678Z"}}