CVE-2026-42506

MEDIUMNVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2026-05-26. NVD baseline CVSS 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: None knownExposed: 0

A fix is available — apply it.

Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: 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
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
14%
KEV
Not listed

Published

May 26, 2026

Last Modified

July 23, 2026

Advisory Details (4)

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

GO-2026-5025 - Go Packages

https://pkg.go.dev/vuln/GO-2026-5025
generic
https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8
generic

x/net/html: incorrect handling of namespaced elements in foreign content · Issue #79571 · golang/go · GitHub

https://go.dev/issue/79571
generic
https://go.dev/cl/781700

Vendor Advisories for CVE-2026-42506(6)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatmulticluster-engine/hypershift-addon-rhel9-operator:17869120062026-08-19redhat
redhatoadp/oadp-velero-rhel9:17840588222026-07-22redhat
redhatodf4/rook-ceph-rhel9-operator:17829342842026-07-09redhat
redhatcluster-observability-operator/monitoring-console-plugin-rhel9:17828384762026-07-01redhat

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

(5 across 5 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
golang-golang-x-net1:0.0+git20210119.5f4716e+dfsg-4 ... 1:0.7.0+dfsg-1 (40 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
golang-golang-x-net1:0.10.0-1 ... 1:0.7.0+dfsg-1 (27 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
golang-golang-x-net1:0.27.0-2 ... 1:0.58.0-1 (10 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
golang-golang-x-net1:0.27.0-2 ... 1:0.53.0-2~bpo13+1 (6 versions)1:0.55.0-1—
Go(1)
PackageVulnerable rangeFixed inDependents
golang.org/x/net—0.55.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 52× 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 215 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-42506?
CVE-2026-42506 is a medium vulnerability published on May 26, 2026. Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.
When was CVE-2026-42506 disclosed?
CVE-2026-42506 was first published in the National Vulnerability Database on May 26, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42506 actively exploited?
CVE-2026-42506 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 85.6% of all scored CVEs.
What is the CVSS score of CVE-2026-42506?
CVE-2026-42506 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-42506?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42506, 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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