{
"id": "GHSA-xx3c-qf5g-hc39",
"aliases": [
"CVE-2026-45068"
],
"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.",
"summary": "Symfony has an Argument Injection in SendmailTransport via Dash-Prefixed Recipient Address",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "5.4.52"
}
]
}
],
"package": {
"name": "symfony/mailer",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "5.4.52"
}
]
}
],
"package": {
"name": "symfony/symfony",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.0.0"
},
{
"fixed": "6.4.40"
}
]
}
],
"package": {
"name": "symfony/mailer",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "7.0.0"
},
{
"fixed": "7.4.12"
}
]
}
],
"package": {
"name": "symfony/mailer",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "8.0.0"
},
{
"fixed": "8.0.12"
}
]
}
],
"package": {
"name": "symfony/mailer",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.0.0"
},
{
"fixed": "6.4.40"
}
]
}
],
"package": {
"name": "symfony/symfony",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "7.0.0"
},
{
"fixed": "7.4.12"
}
]
}
],
"package": {
"name": "symfony/symfony",
"ecosystem": "Packagist"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "8.0.0"
},
{
"fixed": "8.0.12"
}
]
}
],
"package": {
"name": "symfony/symfony",
"ecosystem": "Packagist"
}
}
],
"modified": "2026-05-27T20:46:05Z",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U"
}
],
"published": "2026-05-27T20:46:05Z",
"references": [
{
"url": "https://github.com/symfony/symfony/security/advisories/GHSA-xx3c-qf5g-hc39",
"type": "WEB"
},
{
"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": "WEB"
},
{
"url": "https://github.com/symfony/symfony",
"type": "PACKAGE"
},
{
"url": "https://symfony.com/cve-2026-45068",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-88"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": null,
"github_reviewed_at": "2026-05-27T20:46:05Z"
}
}