CVE-2026-55187
- Source
- https://cve.org/CVERecord?id=CVE-2026-55187
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-55187.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2026-55187
- Aliases
- Downstream
- Related
- Published
- 2026-07-10T21:43:59Z
- Modified
- 2026-10-16T03:00:02Z
- Severity
-
- 5.8 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N CVSS Calculator
- Summary
- Mailpit: Incomplete SSRF protection in Link Check API via IPv6 transition mechanisms (follow-up to CVE-2026-27808)
- Details
-
Mailpit is an email testing tool and API for developers. Prior to 1.30.2, the remediation shipped for CVE-2026-27808 is incomplete because the tools.IsInternalIP deny-list in internal/tools/net.go relies on Go's standard library classification helpers and does not block IPv6 transition mechanisms or prefixes such as NAT64, 6to4, IPv4-compatible IPv6, ISATAP, fec0::/10, and 2001:db8::/32. An attacker who can deliver email and invoke POST /api/v1/message/{ID}/link-check can coerce the Link Check API's safeDialContext path into dialing internal destinations and can use status-code and error feedback to map internal service reachability, including cloud metadata endpoints. This issue is fixed in version 1.30.2.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-918" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55187.json" }- References
-
- https://github.com/axllent/mailpit/releases/tag/v1.30.2
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55187.json
- https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28
- https://nvd.nist.gov/vuln/detail/CVE-2026-55187
- https://github.com/axllent/mailpit/commit/a88dadbbe1df016a35a445089ef2a362a6c2de78
Affected packages
Git / github.com/axllent/mailpit
Affected ranges
- Type
- GIT
- Repo
- https://github.com/axllent/mailpit
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixed
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "0" }, { "fixed": "1.30.2" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "fixed": "a88dadbbe1df016a35a445089ef2a362a6c2de78" } ], "source": "REFERENCES_COMMIT" }, { "original_tag": "v1.30.2", "range": [ { "fixed": "0fb1c79f4bf75418e138424f276f48b4aa4f802b" } ], "source": "REFERENCES_TAG" } ] }
Affected versions
1.*
1.1.7
1.2.0
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
v1.*
v1.10.0
v1.10.1
v1.10.2
v1.10.3
v1.10.4
v1.11.0
v1.11.1
v1.12.0
v1.12.1
v1.13.0
v1.13.1
v1.13.2
v1.13.3
v1.14.0
v1.14.1
v1.14.2
v1.14.3
v1.14.4
v1.15.0
v1.15.1
v1.16.0
v1.17.0
v1.17.1
v1.18.0
v1.18.1
v1.18.2
v1.18.3
v1.18.4
v1.18.5
v1.18.6
v1.18.7
v1.19.0
v1.19.1
v1.19.2
v1.19.3
v1.2.6
v1.2.7
v1.2.8
v1.2.9
v1.20.0
v1.20.1
v1.20.2
v1.20.3
v1.20.4
v1.20.5
v1.20.6
v1.20.7
v1.21.0
v1.21.1
v1.21.2
v1.21.3
v1.21.4
v1.21.5
v1.21.6
v1.21.7
v1.21.8
v1.22.0
v1.22.1
v1.22.2
v1.22.3
v1.23.0
v1.23.1
v1.23.2
v1.24.0
v1.24.1
v1.24.2
v1.25.0
v1.25.1
v1.26.0
v1.26.1
v1.26.2
v1.27.0
v1.27.1
v1.27.10
v1.27.11
v1.27.2
v1.27.3
v1.27.4
v1.27.5
v1.27.6
v1.27.7
v1.27.8
v1.27.9
v1.28.0
v1.28.1
v1.28.2
v1.28.3
v1.28.4
v1.29.0
v1.29.1
v1.29.2
v1.29.3
v1.29.4
v1.29.5
v1.29.6
v1.29.7
v1.3.0
v1.3.1
v1.3.10
v1.3.11
v1.3.2
v1.3.3
v1.3.4
v1.3.5
v1.3.6
v1.3.7
v1.3.8
v1.3.9
v1.30.0
v1.30.1
v1.4.0
v1.5.0
v1.5.1
v1.5.2
v1.5.3
v1.5.4
v1.5.5
v1.6.0
v1.6.1
v1.6.10
v1.6.11
v1.6.12
v1.6.13
v1.6.14
v1.6.15
v1.6.16
v1.6.17
v1.6.18
v1.6.19
v1.6.2
v1.6.20
v1.6.21
v1.6.22
v1.6.3
v1.6.4
v1.6.5
v1.6.6
v1.6.7
v1.6.8
v1.6.9
v1.7.0
v1.7.1
v1.8.0
v1.8.1
v1.8.2
v1.8.3
v1.8.4
v1.9.0
v1.9.1
v1.9.10
v1.9.2
v1.9.3
v1.9.4
v1.9.5
v1.9.6
v1.9.7
v1.9.8
v1.9.9