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CVE-2026-55187

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 A
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:54e68b2f3fc7ea08e271437be36fc2da2aebd1838774164bcb9970ee0675be91
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"mailpit","vendor":"axllent","versions":[{"status":"affected","version":"< 1.30.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:c95000f7accf66367042db6cc2311605aa12800652051562f4abbec666f5acc4 · sha256:b52d41fa5a96f4a9… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.8,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:c95000f7accf66367042db6cc2311605aa12800652051562f4abbec666f5acc4 · sha256:b52d41fa5a96f4a9… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-918","description":"CWE-918: Server-Side Request Forgery (SSRF)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:c95000f7accf66367042db6cc2311605aa12800652051562f4abbec666f5acc4 · sha256:b52d41fa5a96f4a9… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/axllent/mailpit/commit/a88dadbbe1df016a35a445089ef2a362a6c2de78","tags":["x_refsource_MISC"],"url":"https://github.com/axllent/mailpit/commit/a88dadbbe1df016a35a445089ef2a362a6c2de78"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c95000f7accf66367042db6cc2311605aa12800652051562f4abbec666f5acc4 · sha256:b52d41fa5a96f4a9… · /containers/cna/references/1
{"name":"https://github.com/axllent/mailpit/releases/tag/v1.30.2","tags":["x_refsource_MISC"],"url":"https://github.com/axllent/mailpit/releases/tag/v1.30.2"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c95000f7accf66367042db6cc2311605aa12800652051562f4abbec666f5acc4 · sha256:b52d41fa5a96f4a9… · /containers/cna/references/2
{"tags":["exploit"],"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c95000f7accf66367042db6cc2311605aa12800652051562f4abbec666f5acc4 · sha256:b52d41fa5a96f4a9… · /containers/adp/0/references/0
{"name":"https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28","tags":["x_refsource_CONFIRM"],"url":"https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:c95000f7accf66367042db6cc2311605aa12800652051562f4abbec666f5acc4 · sha256:b52d41fa5a96f4a9… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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