CVE-2026-67445

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (41st percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
5.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Mailpit is an email testing tool and API for developers. Prior to 1.30.4, Mailpit reads SMTP commands through internal/smtpd/smtpd.go session.readLine() using bufio.Reader.ReadString before session.parseLine() parses the verb or the RFC 5321 512-octet command-line limit is enforced. An unauthenticated remote SMTP client can send an oversized single command line that is fully allocated before syntax rejection or timeout, and the normal MaxMessageSize and DATA limits do not apply to this pre-DATA path. The same command reader is used by handleAuthLogin(), handleAuthPlain(), and handleAuthCramMD5() continuation lines, so concurrent oversized inputs can create memory pressure and reduce service availability. This issue is fixed in version 1.30.4.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100

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 (value × EchelonGraph’s weight)
Severity53% × 45%
The EG Score, 5.3 of 10.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
41st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 20, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Aug 20, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

SMTP command parser buffers unbounded command lines before syntax rejection · Advisory · axllent/mailpit · GitHub

https://github.com/axllent/mailpit/security/advisories/GHSA-w878-pj84-3j5v
GitHub release Patch Available

Release v1.30.4 (axllent/mailpit)

Patch available: axllent/mailpit v1.30.4

https://github.com/axllent/mailpit/releases/tag/v1.30.4
GitHub commit

commit 993bed95b3c7 (axllent/mailpit)

Fix landed in axllent/mailpit commit 993bed95b3c7 — awaiting tagged release

https://github.com/axllent/mailpit/commit/993bed95b3c74d95231af93bd0e0d4c3d5b4db4d

Vendor Advisories for CVE-2026-67445(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 rangeFix by version rangeDependents
github.com/axllent/mailpit—
  • every version up to 1.30.4: fixed in 1.30.4
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 48× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  3. 2026-10-12 15:45 UTCEG score recompute
  4. 2026-10-11 19:30 UTCEG score recompute
  5. 2026-10-11 16:46 UTCEG score recompute
  6. 2026-10-11 14:06 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  10. 2026-10-09 08:16 UTCEG score recompute
  11. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  12. 2026-10-08 05:21 UTCEG score recompute
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  14. 2026-10-07 04:16 UTCEG score recompute
  15. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  16. 2026-10-06 03:12 UTCEG score recompute
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  19. 2026-10-03 16:46 UTCEG score recompute
  20. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  21. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  22. 2026-10-02 10:15 UTCEG score recompute
  23. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  24. 2026-10-01 09:11 UTCEG score recompute
  25. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
Show 64 more
  1. 2026-09-30 08:08 UTCEG score recompute
  2. 2026-09-29 05:01 UTCEG score recompute
  3. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  4. 2026-09-28 03:57 UTCEG score recompute
  5. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  6. 2026-09-27 02:54 UTCEG score recompute
  7. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-09-25 02:40 UTCEG score recompute
  9. 2026-09-24 01:36 UTCEG score recompute
  10. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  11. 2026-09-23 00:33 UTCEG score recompute
  12. 2026-09-21 23:30 UTCEG score recompute
  13. 2026-09-20 22:26 UTCEG score recompute
  14. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  15. 2026-09-19 21:22 UTCEG score recompute
  16. 2026-09-18 20:18 UTCEG score recompute
  17. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  18. 2026-09-18 11:56 UTCEG score recompute
  19. 2026-09-17 10:53 UTCEG score recompute
  20. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  21. 2026-09-16 09:40 UTCEG score recompute
  22. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  23. 2026-09-15 08:13 UTCEG score recompute
  24. 2026-09-14 07:09 UTCEG score recompute
  25. 2026-09-13 06:06 UTCEG score recompute
  26. 2026-09-12 05:03 UTCEG score recompute
  27. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  28. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  29. 2026-09-11 03:59 UTCEG score recompute
  30. 2026-09-09 01:53 UTCEG score recompute
  31. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  32. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  33. 2026-09-06 14:22 UTCEG score recompute
  34. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  35. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  36. 2026-09-05 13:19 UTCEG score recompute
  37. 2026-09-04 12:16 UTCEG score recompute
  38. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  39. 2026-09-03 11:11 UTCEG score recompute
  40. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  41. 2026-09-02 10:06 UTCEG score recompute
  42. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  43. 2026-09-01 09:02 UTCEG score recompute
  44. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  45. 2026-08-31 07:57 UTCEG score recompute
  46. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  47. 2026-08-30 06:54 UTCEG score recompute
  48. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  49. 2026-08-29 05:50 UTCEG score recompute
  50. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  51. 2026-08-28 04:46 UTCEG score recompute
  52. 2026-08-27 03:42 UTCEG score recompute
  53. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  54. 2026-08-26 02:39 UTCEG score recompute
  55. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  56. 2026-08-25 01:35 UTCEG score recompute
  57. 2026-08-24 00:32 UTCEG score recompute
  58. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  59. 2026-08-22 23:29 UTCEG score recompute
  60. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  61. 2026-08-21 22:25 UTCEG score recompute
  62. 2026-08-21 21:52 UTCEG score recompute
  63. 2026-08-20 21:17 UTCEG score recomputeFirst assessed: 5.3 MEDIUM
  64. 2026-08-20 21:16 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-67445?
CVE-2026-67445 is a medium-severity vulnerability; its CVE record was published on August 20, 2026. Mailpit is an email testing tool and API for developers. Prior to 1.30.4, Mailpit reads SMTP commands through internal/smtpd/smtpd.go session.readLine() using bufio.Reader.ReadString before session.parseLine() parses the verb or the RFC 5321 512-octet command-line limit is enforced. An…
When was the CVE record for CVE-2026-67445 published?
The CVE record for CVE-2026-67445 was published on August 20, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 18, 2026; the record at its source may have been updated since.
Is CVE-2026-67445 actively exploited?
CVE-2026-67445 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (41st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-67445?
CVE-2026-67445 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-67445?
A fix for CVE-2026-67445 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-67445 are linked in the Vendor Advisories panel on this page.

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