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
45%
KEV
Not listed

Published

June 2, 2026

Last Modified

September 17, 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(20)

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

Patch Availability(30)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatosbuild-composer-0:75-10.el8_82026-09-17redhat
redhatopentelemetry-collector-0:0.152.1-2.el9_62026-09-16redhat
redhatopentelemetry-collector-0:0.152.1-2.el10_02026-09-16redhat
redhatflightctl-0:1.1.4-1.el9em2026-09-16redhat
redhatopenshift-0:4.20.0-202609041738.p2.g4012064.assembly.stream.el82026-09-15redhat
redhatose-crio-credential-provider-0:4.21.0-202609021357.p2.g83d4961.assembly.stream.el102026-09-15redhat
redhatgrafana-pcp-0:5.1.1-9.el9_42026-09-14redhat
redhatosbuild-composer-0:101.5-3.el8_102026-09-14redhat
redhatgrafana-pcp-0:5.1.1-5.el9_2.22026-09-14redhat
redhatosbuild-composer-0:134.1-12.el10_02026-09-10redhat
redhatoadp/oadp-velero-rhel9:17888604612026-09-09redhat
redhatimage-builder-0:52.1-1.el9_8.22026-09-09redhat
redhatosbuild-composer-0:165.1-3.el10_2.22026-09-09redhat
redhatopentelemetry-collector-0:0.152.1-2.el9_82026-09-08redhat
redhatosbuild-composer-0:165.1-4.el9_8.12026-09-08redhat
redhatimage-builder-0:52.1-1.el10_2.22026-09-08redhat
redhatopentelemetry-collector-0:0.152.1-2.el10_22026-09-08redhat
redhatose-crio-credential-provider-0:4.22.0-202608271248.p2.g83d4961.assembly.stream.el82026-09-08redhat
redhatgrafana-pcp-0:5.3.0-8.el10_2.12026-09-03redhat
redhatopenshift-gitops-1/dex-rhel9:17877361982026-09-03redhat
redhatopenshift4/ose-ansible-rhel9-operator:17875543472026-09-03redhat
redhatose-gcp-gcr-image-credential-provider-0:4.17.0-202608122146.p2.g8ce997d.assembly.stream.el82026-09-03redhat
redhatopenshift4/frr-rhel9:17875434722026-09-03redhat
redhatopenshift-gitops-1/dex-rhel8:17877516132026-09-03redhat
redhatgrafana-pcp-0:5.1.1-18.el8_102026-09-03redhat
redhatgo-fdo-client-0:1.0.0-4.el10_2.72026-09-02redhat
redhatgolang-github-openprinting-ipp-usb-0:0.9.27-7.el10_2.32026-09-02redhat
redhatgolang-0:1.26.7-1.el10_02026-09-01redhat
redhatgolang-0:1.26.5-1.el9_22026-08-31redhat
redhatose-gcp-gcr-image-credential-provider-0:4.18.0-202608121933.p2.g6ea2356.assembly.stream.el82026-08-26redhat

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

(6 across 5 ecosystems)
Debian:14(2)
PackageVulnerable rangeFixed inDependents
golang-1.251.25.0-1 ... 1.25.9-1 (15 versions)1.25.11-1—
golang-1.261.26.0-1 ... 1.26~rc3-2 (13 versions)1.26.4-1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
golang-1.151.15.15-1 ... 1.15.9-6 (10 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
golang-1.191.19.10-1 ... 1.19.9-1 (12 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
golang-1.241.24.12-1 ... 1.24.9-1 (10 versions)——
Go(1)
PackageVulnerable rangeFixed inDependents
stdlib—1.26.4—

Weakness Classification(1)

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

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 15× in last 7d / 78× 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 404 total refreshes for this CVE.

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

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 September 17, 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 54.6% 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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