CVE-2026-67446

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
Elevated
5.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.3Exploit: No code on recordExposed 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 decodes attacker-supplied image attachments into a full raster before checking decoded dimensions, pixel count, or memory use in the GET /api/v1/message/{id}/part/{partID}/thumb endpoint. The Thumbnail handler in server/apiv1/thumbnails.go obtains attachment bytes through storage.GetAttachmentPart(), accepts image/* content, and calls imaging.Decode() with AutoOrientation before imaging.Fill() scales the image to 180 by 120 pixels. A compact image declaring very large dimensions can therefore consume disproportionately large memory and CPU, and opening the message UI can trigger the same endpoint through server/ui-src/components/message/MessageAttachments.vue. This can degrade availability when an unauthenticated client can store the crafted attachment and reach the web API. This issue is fixed in version 1.30.4.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
55
EG Risk 55/100

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.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
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 public PoC (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 public PoC (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)

Thumbnail generation decodes unbounded image dimensions before scaling · Advisory · axllent/mailpit · GitHub

https://github.com/axllent/mailpit/security/advisories/GHSA-75mr-qw9x-3r39
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 6bcb6337838b (axllent/mailpit)

Fix landed in axllent/mailpit commit 6bcb6337838b — awaiting tagged release

https://github.com/axllent/mailpit/commit/6bcb6337838b542d53c348e38c7977f569b6db35

Vendor Advisories for CVE-2026-67446(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(2)

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

Data Freshness Timeline

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

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Frequently asked(5)

What is CVE-2026-67446?
CVE-2026-67446 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 decodes attacker-supplied image attachments into a full raster before checking decoded dimensions, pixel count, or memory use in the GET /api/v1/message/{id}/part/{partID}/thumb endpoint. The Thumbnail handler in…
When was the CVE record for CVE-2026-67446 published?
The CVE record for CVE-2026-67446 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-2026-67446 actively exploited?
CVE-2026-67446 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-2026-67446?
CVE-2026-67446 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-2026-67446?
A fix for CVE-2026-67446 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-67446 are linked in the Vendor Advisories panel on this page.

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