CVE-2026-53859

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-06-16. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

OpenClaw before 2026.5.26 contains a hostname validation vulnerability allowing attackers to bypass blocklist comparisons using trailing-dot notation in model or workspace-derived URLs. Attackers can exploit inconsistent hostname checks to reach destinations that operators intended to block through hostname policies.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
11%
KEV
Not listed

Published

June 16, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Jun 16, 2026
Patch available. Sources: github.
generic

OpenClaw < 2026.5.26 - Hostname Validation Bypass via Trailing-Dot Inconsistency | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openclaw-hostname-validation-bypass-via-trailing-dot-inconsistency
github Patch Available

Hostname checks could treat trailing-dot hosts inconsistently · Advisory · openclaw/openclaw · GitHub

https://github.com/openclaw/openclaw/security/advisories/GHSA-gxg4-2rrr-jhc7

Vendor Advisories for CVE-2026-53859(1)

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

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
openclaw—2026.5.26—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 48× 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 113 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-53859?
CVE-2026-53859 is a medium vulnerability published on June 16, 2026. OpenClaw before 2026.5.26 contains a hostname validation vulnerability allowing attackers to bypass blocklist comparisons using trailing-dot notation in model or workspace-derived URLs. Attackers can exploit inconsistent hostname checks to reach destinations that operators intended to block through…
When was CVE-2026-53859 disclosed?
CVE-2026-53859 was first published in the National Vulnerability Database on June 16, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53859 actively exploited?
CVE-2026-53859 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 88.9% of all scored CVEs.
What is the CVSS score of CVE-2026-53859?
CVE-2026-53859 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-53859?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53859, 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-2026-53859

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