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
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(15)

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

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatmulticluster-engine/hypershift-addon-rhel9-operator:17869120062026-08-19redhat
redhatrhosdt/opentelemetry-rhel9-operator:17857045472026-08-04redhat
redhatgo-toolset:rhel8-8100020260710105056.a3795dee2026-07-13redhat
redhatrhosdt/tempo-rhel9-operator:17825011952026-06-30redhat
redhatgolang-0:1.26.4-1.el9_82026-06-25redhat
redhatgolang-0:1.26.4-1.el10_22026-06-25redhat
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

(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—

Data Freshness Timeline

(refreshed 4× in last 7d / 59× 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 235 total refreshes for this CVE.

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

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 69.8% 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

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