CVE-2026-42504

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — Patch released this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

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
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

June 2, 2026

Last Modified

July 24, 2026

Advisory Details (4)

Auto-updated Jun 11, 2026
No patch confirmed yet.
generic

GO-2026-5038 - Go Packages

https://pkg.go.dev/vuln/GO-2026-5038
generic
https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw
generic

mime: quadratic complexity in WordDecoder.DecodeHeader · Issue #79217 · golang/go · GitHub

https://go.dev/issue/79217
generic
https://go.dev/cl/774481

Vendor Advisories for CVE-2026-42504(14)

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

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhoai/odh-rhel9-operator:17840049142026-07-21redhat
redhatmta/mta-cli-rhel9:17842113782026-07-21redhat
redhatweb-terminal/web-terminal-exec-rhel9:17842961272026-07-20redhat
redhatweb-terminal/web-terminal-exec-rhel9:17842957672026-07-20redhat
redhatweb-terminal/web-terminal-exec-rhel9:17842962032026-07-20redhat
redhatweb-terminal/web-terminal-exec-rhel9:17842960332026-07-20redhat
redhatweb-terminal/web-terminal-exec-rhel9:17842476102026-07-20redhat
redhatweb-terminal/web-terminal-exec-rhel9:17842961142026-07-20redhat
redhatrhdh/rhdh-rhel9-operator:17842105752026-07-20redhat
redhatquay/quay-rhel9:17839558462026-07-16redhat
redhatgolang1-26-main-1.26.4-2.hum12026-06-04redhat
redhatgolang1-25-main-1.25.11-2.hum12026-06-04redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
stdlib—1.26.4—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 77× 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.

Showing the most recent 100 of 181 total refreshes for this CVE.

  1. 2026-07-26 22:46 UTCEG score recompute
  2. 2026-07-26 22:46 UTCVendor advisory
  3. 2026-07-26 22:46 UTCGHSA enrichment
  4. 2026-07-26 14:54 UTCEPSS rescore
  5. 2026-07-26 14:54 UTCEPSS rescore
  6. 2026-07-26 07:36 UTCEG score recompute
  7. 2026-07-26 07:36 UTCVendor advisory
  8. 2026-07-26 07:36 UTCGHSA enrichment
  9. 2026-07-25 14:18 UTCEPSS rescore
  10. 2026-07-24 14:17 UTCEPSS rescore
  11. 2026-07-23 14:18 UTCEPSS rescore
  12. 2026-07-23 03:11 UTCEG score recompute
  13. 2026-07-22 14:08 UTCEPSS rescore
  14. 2026-07-21 15:24 UTCEPSS rescore
  15. 2026-07-20 17:08 UTCEPSS rescore
  16. 2026-07-19 14:31 UTCEPSS rescore
  17. 2026-07-19 02:29 UTCEPSS rescore
  18. 2026-07-18 10:04 UTCEPSS rescore
  19. 2026-07-16 17:03 UTCEPSS rescore
  20. 2026-07-16 00:50 UTCVendor advisory
  21. 2026-07-16 00:50 UTCGHSA enrichment
  22. 2026-07-15 16:57 UTCEPSS rescore
  23. 2026-07-15 02:00 UTCEPSS rescore
  24. 2026-07-14 15:15 UTCVendor advisory
  25. 2026-07-14 15:15 UTCGHSA enrichment
Show 75 more
  1. 2026-07-14 03:35 UTCVendor advisory
  2. 2026-07-14 03:35 UTCGHSA enrichment
  3. 2026-07-13 22:30 UTCEPSS rescore
  4. 2026-07-13 06:13 UTCEPSS rescore
  5. 2026-07-12 05:46 UTCEPSS rescore
  6. 2026-07-12 00:32 UTCVendor advisory
  7. 2026-07-12 00:32 UTCGHSA enrichment
  8. 2026-07-11 12:48 UTCVendor advisory
  9. 2026-07-11 12:48 UTCGHSA enrichment
  10. 2026-07-11 08:27 UTCEPSS rescore
  11. 2026-07-09 19:10 UTCEPSS rescore
  12. 2026-07-09 07:21 UTCVendor advisory
  13. 2026-07-09 07:21 UTCGHSA enrichment
  14. 2026-07-08 16:34 UTCVendor advisory
  15. 2026-07-08 16:34 UTCGHSA enrichment
  16. 2026-07-08 15:15 UTCEPSS rescore
  17. 2026-07-07 13:46 UTCEPSS rescore
  18. 2026-07-06 16:27 UTCEPSS rescore
  19. 2026-07-06 16:27 UTCEPSS rescore
  20. 2026-07-06 02:23 UTCEPSS rescore
  21. 2026-07-06 02:23 UTCEPSS rescore
  22. 2026-07-05 02:30 UTCEPSS rescore
  23. 2026-07-04 06:31 UTCEPSS rescore
  24. 2026-07-03 20:31 UTCVendor advisory
  25. 2026-07-03 20:31 UTCGHSA enrichment
  26. 2026-07-02 19:51 UTCVendor advisory
  27. 2026-07-02 19:51 UTCGHSA enrichment
  28. 2026-07-02 08:24 UTCVendor advisory
  29. 2026-07-02 08:24 UTCGHSA enrichment
  30. 2026-07-01 21:03 UTCVendor advisory
  31. 2026-07-01 21:03 UTCGHSA enrichment
  32. 2026-07-01 15:06 UTCEPSS rescore
  33. 2026-07-01 09:42 UTCVendor advisory
  34. 2026-07-01 09:41 UTCGHSA enrichment
  35. 2026-06-30 23:22 UTCEPSS rescore
  36. 2026-06-30 22:21 UTCVendor advisory
  37. 2026-06-30 22:21 UTCGHSA enrichment
  38. 2026-06-29 23:12 UTCVendor advisory
  39. 2026-06-29 23:12 UTCGHSA enrichment
  40. 2026-06-29 14:06 UTCEPSS rescore
  41. 2026-06-29 11:48 UTCVendor advisory
  42. 2026-06-29 11:48 UTCGHSA enrichment
  43. 2026-06-29 00:26 UTCVendor advisory
  44. 2026-06-29 00:26 UTCGHSA enrichment
  45. 2026-06-28 14:07 UTCEPSS rescore
  46. 2026-06-28 13:05 UTCVendor advisory
  47. 2026-06-28 13:05 UTCGHSA enrichment
  48. 2026-06-28 04:56 UTCEPSS rescore
  49. 2026-06-28 01:45 UTCVendor advisory
  50. 2026-06-28 01:45 UTCGHSA enrichment
  51. 2026-06-27 14:16 UTCVendor advisory
  52. 2026-06-27 14:16 UTCGHSA enrichment
  53. 2026-06-27 03:08 UTCEPSS rescore
  54. 2026-06-27 02:56 UTCVendor advisory
  55. 2026-06-27 02:56 UTCGHSA enrichment
  56. 2026-06-26 15:21 UTCVendor advisory
  57. 2026-06-26 15:21 UTCGHSA enrichment
  58. 2026-06-26 01:26 UTCVendor advisory
  59. 2026-06-26 01:26 UTCGHSA enrichment
  60. 2026-06-25 13:49 UTCEPSS rescore
  61. 2026-06-25 13:49 UTCEPSS rescore
  62. 2026-06-25 13:14 UTCVendor advisory
  63. 2026-06-25 13:14 UTCGHSA enrichment
  64. 2026-06-25 01:53 UTCVendor advisory
  65. 2026-06-25 01:53 UTCGHSA enrichment
  66. 2026-06-24 14:33 UTCVendor advisory
  67. 2026-06-24 14:33 UTCGHSA enrichment
  68. 2026-06-24 14:05 UTCEPSS rescore
  69. 2026-06-23 21:33 UTCEPSS rescore
  70. 2026-06-23 19:25 UTCVendor advisory
  71. 2026-06-23 19:25 UTCGHSA enrichment
  72. 2026-06-22 14:25 UTCEPSS rescore
  73. 2026-06-22 14:25 UTCEPSS rescore
  74. 2026-06-21 14:56 UTCEPSS rescore
  75. 2026-06-21 14:56 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-42504?
CVE-2026-42504 is a high vulnerability published on June 2, 2026. Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.
When was CVE-2026-42504 disclosed?
CVE-2026-42504 was first published in the National Vulnerability Database on June 2, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42504 actively exploited?
CVE-2026-42504 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.7% of all scored CVEs.
What is the CVSS score of CVE-2026-42504?
CVE-2026-42504 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42504?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42504, 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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