Mailpit: Path traversal & arbitrary file write in mailpit dump --http via attacker-controlled message IDs
Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the mailpit dump --http sub-command downloads every message from a remote Mailpit instance and writes each one as .eml inside the user-supplied output directory. The message ID field is taken verbatim from the JSON response of the remote server and concatenated into the output path with path.Join, which silently normalizes `..` segments. A malicious HTTP server impersonating Mailpit can therefore make mailpit dump write attacker-controlled bytes to any path the running user can write, fully outside the intended output directory. Version 1.30.0 contains a patch.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-45711
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 08:40 UTC · Revision 1
Source evidence
Mailpit: Path traversal & arbitrary file write in mailpit dump --http via attacker-controlled message IDs
core-osv · Original sourcePublished 20 Jul 2026, 14:39 UTC
Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the mailpit dump --http sub-command downloads every message from a remote Mailpit instance and writes each one as .eml inside the user-supplied output directory. The message ID field is taken verbatim from the JSON response of the remote server and concatenated into the output path with path.Join, which silently normalizes `..` segments. A malicious HTTP server impersonating Mailpit can therefore make mailpit dump write attacker-controlled bytes to any path the running user can write, fully outside the intended output directory. Version 1.30.0 contains a patch.
osv:CVE-2026-45711
Complete source record
{
"id": "cf963d75877c3df81573bc3482e1ab7d47f106e7b93389b81317b3e57b6e6a01",
"url": "https://osv.dev/vulnerability/CVE-2026-45711",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Mailpit: Path traversal & arbitrary file write in mailpit dump --http via attacker-controlled message IDs",
"summary": "Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the mailpit dump --http sub-command downloads every message from a remote Mailpit instance and writes each one as .eml inside the user-supplied output directory. The message ID field is taken verbatim from the JSON response of the remote server and concatenated into the output path with path.Join, which silently normalizes `..` segments. A malicious HTTP server impersonating Mailpit can therefore make mailpit dump write attacker-controlled bytes to any path the running user can write, fully outside the intended output directory. Version 1.30.0 contains a patch.",
"evidence": "osv:CVE-2026-45711",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2026-45711",
"aliases": [
"CVE-2026-45711",
"GHSA-qx5x-85p8-vg4j",
"GO-2026-5599"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/axllent/mailpit",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "af8756a32cf7ecf06bef109c1348b783f1a239ee"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "1.30.0"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
},
{
"range": [
{
"fixed": "af8756a32cf7ecf06bef109c1348b783f1a239ee"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v1.30.0"
},
{
"cpe": "cpe:2.3:a:axllent:mailpit:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.30.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45711.json"
}
}
],
"modified": "2026-10-28T02:30:34.016514320Z",
"provider": "osv",
"references": [
"https://github.com/axllent/mailpit/releases/tag/v1.30.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45711.json",
"https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4j",
"https://nvd.nist.gov/vuln/detail/CVE-2026-45711"
],
"provider_metadata": {
"cwe_ids": [
"CWE-22",
"CWE-829"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45711.json"
}
},
"related_cves": [
{
"value": "CVE-2026-45711",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 501193,
"published_at": "2026-07-20T14:39:06.69+00:00"
}