CVE-2026-42507

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2026-06-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

A fix is available — apply it.

When returning errors, functions in the net/textproto package would include its input as part of the error. This might allow an attacker to inject misleading content to errors that are printed or logged.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
30%
KEV
Not listed

Published

June 2, 2026

Last Modified

July 22, 2026

Advisory Details (4)

Auto-updated Jun 15, 2026
No patch confirmed yet.
generic

GO-2026-5039 - Go Packages

https://pkg.go.dev/vuln/GO-2026-5039
generic
https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw
generic

net/textproto: arbitrary input are included as part of error without escaping · Issue #79346 · golang/go · GitHub

https://go.dev/issue/79346
generic
https://go.dev/cl/777060

Vendor Advisories for CVE-2026-42507(7)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhosdt/tempo-rhel9-operator:17825011952026-06-30redhat
redhatgolang-0:1.26.4-1.el10_22026-06-25redhat
redhatgolang-0:1.26.4-1.el9_82026-06-25redhat
redhatgolang1-25-main-1.25.11-2.hum12026-06-04redhat
redhatgolang1-26-main-1.26.4-2.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—

Data Freshness Timeline

(refreshed 12× in last 7d / 55× 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 128 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. 2026-07-25 14:18 UTCEPSS rescore
  7. 2026-07-24 14:17 UTCEPSS rescore
  8. 2026-07-23 14:18 UTCEPSS rescore
  9. 2026-07-23 03:11 UTCEG score recompute
  10. 2026-07-22 14:08 UTCEPSS rescore
  11. 2026-07-21 15:24 UTCEPSS rescore
  12. 2026-07-20 17:08 UTCEPSS rescore
  13. 2026-07-19 14:31 UTCEPSS rescore
  14. 2026-07-19 02:29 UTCEPSS rescore
  15. 2026-07-18 10:04 UTCEPSS rescore
  16. 2026-07-16 17:03 UTCEPSS rescore
  17. 2026-07-16 00:51 UTCVendor advisory
  18. 2026-07-16 00:50 UTCGHSA enrichment
  19. 2026-07-15 16:57 UTCEPSS rescore
  20. 2026-07-15 02:00 UTCEPSS rescore
  21. 2026-07-14 03:35 UTCVendor advisory
  22. 2026-07-14 03:35 UTCGHSA enrichment
  23. 2026-07-13 22:30 UTCEPSS rescore
  24. 2026-07-13 06:13 UTCEPSS rescore
  25. 2026-07-12 05:46 UTCEPSS rescore
Show 75 more
  1. 2026-07-11 12:48 UTCVendor advisory
  2. 2026-07-11 12:48 UTCGHSA enrichment
  3. 2026-07-11 08:27 UTCEPSS rescore
  4. 2026-07-09 19:10 UTCEPSS rescore
  5. 2026-07-08 16:34 UTCVendor advisory
  6. 2026-07-08 16:34 UTCGHSA enrichment
  7. 2026-07-06 16:27 UTCEPSS rescore
  8. 2026-07-06 16:27 UTCEPSS rescore
  9. 2026-07-06 02:23 UTCEPSS rescore
  10. 2026-07-06 02:23 UTCEPSS rescore
  11. 2026-07-05 02:30 UTCEPSS rescore
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-03 20:28 UTCVendor advisory
  14. 2026-07-03 20:28 UTCGHSA enrichment
  15. 2026-07-02 18:35 UTCVendor advisory
  16. 2026-07-02 18:35 UTCGHSA enrichment
  17. 2026-07-01 20:27 UTCVendor advisory
  18. 2026-07-01 20:27 UTCGHSA enrichment
  19. 2026-07-01 15:06 UTCEPSS rescore
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 22:21 UTCVendor advisory
  22. 2026-06-30 22:21 UTCGHSA enrichment
  23. 2026-06-29 13:34 UTCVendor advisory
  24. 2026-06-29 13:34 UTCGHSA enrichment
  25. 2026-06-28 15:28 UTCVendor advisory
  26. 2026-06-28 15:28 UTCGHSA enrichment
  27. 2026-06-28 14:07 UTCEPSS rescore
  28. 2026-06-28 04:56 UTCEPSS rescore
  29. 2026-06-27 17:03 UTCVendor advisory
  30. 2026-06-27 17:03 UTCGHSA enrichment
  31. 2026-06-27 03:08 UTCEPSS rescore
  32. 2026-06-26 18:45 UTCVendor advisory
  33. 2026-06-26 18:45 UTCGHSA enrichment
  34. 2026-06-25 20:33 UTCVendor advisory
  35. 2026-06-25 20:33 UTCGHSA enrichment
  36. 2026-06-25 13:49 UTCEPSS rescore
  37. 2026-06-25 13:49 UTCEPSS rescore
  38. 2026-06-24 22:26 UTCVendor advisory
  39. 2026-06-24 22:26 UTCGHSA enrichment
  40. 2026-06-24 14:05 UTCEPSS rescore
  41. 2026-06-23 21:33 UTCEPSS rescore
  42. 2026-06-23 19:25 UTCVendor advisory
  43. 2026-06-23 19:25 UTCGHSA enrichment
  44. 2026-06-22 14:25 UTCEPSS rescore
  45. 2026-06-22 14:25 UTCEPSS rescore
  46. 2026-06-21 14:56 UTCEPSS rescore
  47. 2026-06-21 14:56 UTCEPSS rescore
  48. 2026-06-21 01:59 UTCEPSS rescore
  49. 2026-06-20 12:57 UTCVendor advisory
  50. 2026-06-20 12:57 UTCGHSA enrichment
  51. 2026-06-19 19:25 UTCEPSS rescore
  52. 2026-06-19 02:45 UTCVendor advisory
  53. 2026-06-19 02:45 UTCGHSA enrichment
  54. 2026-06-18 17:52 UTCEPSS rescore
  55. 2026-06-18 17:52 UTCEPSS rescore
  56. 2026-06-18 04:30 UTCGHSA enrichment
  57. 2026-06-17 17:53 UTCEPSS rescore
  58. 2026-06-17 06:22 UTCGHSA enrichment
  59. 2026-06-16 17:52 UTCEPSS rescore
  60. 2026-06-16 08:13 UTCVendor advisory
  61. 2026-06-16 08:12 UTCGHSA enrichment
  62. 2026-06-15 17:49 UTCEPSS rescore
  63. 2026-06-15 10:06 UTCVendor advisory
  64. 2026-06-15 10:06 UTCGHSA enrichment
  65. 2026-06-14 11:55 UTCVendor advisory
  66. 2026-06-14 11:55 UTCGHSA enrichment
  67. 2026-06-13 23:00 UTCEPSS rescore
  68. 2026-06-13 13:49 UTCGHSA enrichment
  69. 2026-06-12 23:12 UTCEPSS rescore
  70. 2026-06-12 23:12 UTCEPSS rescore
  71. 2026-06-12 15:25 UTCVendor advisory
  72. 2026-06-12 15:25 UTCGHSA enrichment
  73. 2026-06-11 17:19 UTCVendor advisory
  74. 2026-06-11 17:19 UTCGHSA enrichment
  75. 2026-06-11 14:00 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-42507?
CVE-2026-42507 is a medium vulnerability published on June 2, 2026. When returning errors, functions in the net/textproto package would include its input as part of the error. This might allow an attacker to inject misleading content to errors that are printed or logged.
When was CVE-2026-42507 disclosed?
CVE-2026-42507 was first published in the National Vulnerability Database on June 2, 2026, with the most recent update on July 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42507 actively exploited?
CVE-2026-42507 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 70.3% of all scored CVEs.
What is the CVSS score of CVE-2026-42507?
CVE-2026-42507 has a CVSS v3.1 base score of 5.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-42507?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42507, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-42507

Explore →

Is Your Infrastructure Affected by CVE-2026-42507?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs