CVE-2026-55187

MEDIUMPre-NVD 5.85.8—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 69% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
5.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.8
EG Score
5.8(medium)
EG Risk
57(Attend)
EG Risk 57/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity58% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

June 19, 2026

Last Modified

July 13, 2026

Advisory Details (3)

Auto-updated Jul 10, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github.
github Patch Available🟡 PoC Available

Incomplete SSRF protection in Link Check API via uncovered IPv6 forms (follow-up to GHSA-mpf7-p9x7-96r3 / CVE-2026-27808) · Advisory · axllent/mailpit · GitHub

https://github.com/axllent/mailpit/security/advisories/GHSA-w4mc-hhc6-xp28
github_release Patch Available

Release v1.30.2 (axllent/mailpit)

Patch available: axllent/mailpit v1.30.2

https://github.com/axllent/mailpit/releases/tag/v1.30.2
github_commit

commit a88dadbbe1df (axllent/mailpit)

Fix landed in axllent/mailpit commit a88dadbbe1df — awaiting tagged release

https://github.com/axllent/mailpit/commit/a88dadbbe1df016a35a445089ef2a362a6c2de78

Vendor Advisories for CVE-2026-55187(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/axllent/mailpit—1.30.2—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 37× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-10 09:35 UTCEPSS rescore
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-07 16:01 UTCEPSS rescore
  5. 2026-09-06 13:47 UTCEPSS rescore
  6. 2026-09-04 05:06 UTCEPSS rescore
  7. 2026-09-02 14:12 UTCEPSS rescore
  8. 2026-09-01 13:54 UTCEPSS rescore
  9. 2026-09-01 04:40 UTCEPSS rescore
  10. 2026-08-30 20:45 UTCEG score recompute
  11. 2026-08-30 19:17 UTCEPSS rescore
  12. 2026-08-30 01:22 UTCEPSS rescore
  13. 2026-08-28 21:41 UTCEPSS rescore
  14. 2026-08-27 14:25 UTCEPSS rescore
  15. 2026-08-26 14:46 UTCEPSS rescore
  16. 2026-08-25 13:49 UTCEPSS rescore
  17. 2026-08-25 01:56 UTCEG score recompute
  18. 2026-08-24 00:42 UTCEG score recompute
  19. 2026-08-23 00:19 UTCEPSS rescore
  20. 2026-08-22 23:32 UTCEG score recompute
  21. 2026-08-21 23:49 UTCEPSS rescore
  22. 2026-08-21 09:26 UTCEG score recompute
  23. 2026-08-20 22:55 UTCEPSS rescore
  24. 2026-08-20 07:59 UTCEG score recompute
  25. 2026-08-19 17:04 UTCEPSS rescore
Show 61 more
  1. 2026-08-19 05:55 UTCEG score recompute
  2. 2026-08-18 13:48 UTCEPSS rescore
  3. 2026-08-17 13:47 UTCEPSS rescore
  4. 2026-08-17 06:37 UTCEG score recompute
  5. 2026-08-16 14:56 UTCEPSS rescore
  6. 2026-08-16 05:25 UTCEG score recompute
  7. 2026-08-16 02:14 UTCEPSS rescore
  8. 2026-08-15 04:16 UTCEG score recompute
  9. 2026-08-15 01:30 UTCEPSS rescore
  10. 2026-08-14 03:05 UTCEG score recompute
  11. 2026-08-13 22:00 UTCEPSS rescore
  12. 2026-08-13 01:56 UTCEG score recompute
  13. 2026-08-12 13:51 UTCEPSS rescore
  14. 2026-08-12 00:46 UTCEG score recompute
  15. 2026-08-11 00:00 UTCEPSS rescore
  16. 2026-08-09 22:26 UTCEG score recompute
  17. 2026-08-09 13:46 UTCEPSS rescore
  18. 2026-08-08 21:16 UTCEG score recompute
  19. 2026-08-08 16:37 UTCEPSS rescore
  20. 2026-08-07 20:05 UTCEG score recompute
  21. 2026-08-06 18:55 UTCEG score recompute
  22. 2026-08-06 13:47 UTCEPSS rescore
  23. 2026-08-05 19:17 UTCEPSS rescore
  24. 2026-08-04 15:18 UTCEG score recompute
  25. 2026-08-04 15:10 UTCEPSS rescore
  26. 2026-08-04 10:39 UTCEPSS rescore
  27. 2026-08-03 10:36 UTCEPSS rescore
  28. 2026-08-02 06:33 UTCEG score recompute
  29. 2026-08-02 02:27 UTCEPSS rescore
  30. 2026-08-01 05:23 UTCEG score recompute
  31. 2026-08-01 04:16 UTCEPSS rescore
  32. 2026-07-31 04:11 UTCEG score recompute
  33. 2026-07-30 16:28 UTCEPSS rescore
  34. 2026-07-30 02:54 UTCEG score recompute
  35. 2026-07-30 01:30 UTCEPSS rescore
  36. 2026-07-29 01:33 UTCEG score recompute
  37. 2026-07-28 15:37 UTCEPSS rescore
  38. 2026-07-27 18:02 UTCEG score recompute
  39. 2026-07-26 16:47 UTCEG score recompute
  40. 2026-07-26 14:54 UTCEPSS rescore
  41. 2026-07-25 14:18 UTCEPSS rescore
  42. 2026-07-24 14:18 UTCEPSS rescore
  43. 2026-07-23 14:18 UTCEPSS rescore
  44. 2026-07-23 03:20 UTCEG score recompute
  45. 2026-07-22 14:08 UTCEPSS rescore
  46. 2026-07-21 15:25 UTCEPSS rescore
  47. 2026-07-20 17:08 UTCEPSS rescore
  48. 2026-07-19 14:31 UTCEPSS rescore
  49. 2026-07-19 14:31 UTCEPSS rescore
  50. 2026-07-19 02:29 UTCEPSS rescore
  51. 2026-07-18 10:04 UTCEPSS rescore
  52. 2026-07-16 17:03 UTCEPSS rescore
  53. 2026-07-15 16:57 UTCEPSS rescore
  54. 2026-07-15 16:57 UTCEPSS rescore
  55. 2026-07-15 02:00 UTCEPSS rescore
  56. 2026-07-15 02:00 UTCEPSS rescore
  57. 2026-07-13 22:31 UTCEPSS rescore
  58. 2026-07-13 06:13 UTCEPSS rescore
  59. 2026-07-13 06:13 UTCEPSS rescore
  60. 2026-07-12 05:46 UTCEPSS rescore
  61. 2026-06-19 21:23 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-55187?
CVE-2026-55187 is a medium vulnerability published on June 19, 2026. 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…
When was CVE-2026-55187 disclosed?
CVE-2026-55187 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on July 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55187 actively exploited?
CVE-2026-55187 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 68.2% of all scored CVEs.
What is the CVSS score of CVE-2026-55187?
CVE-2026-55187 has a CVSS v3 base score of 5.8 (NVD).
How do I remediate CVE-2026-55187?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55187, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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