CVE-2026-53839

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-06-13. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

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

OpenClaw before 2026.5.7 contains a hostname validation vulnerability in retry endpoint checks that allows matching hostname prefixes instead of exact hostnames. Attackers can exploit this by crafting a hostname prefix resembling a trusted host to send authentication material to untrusted endpoints.

CVSS v3
6.5
EG Score
6.5(high)
EPSS
17.9%
KEV
Not listed

Published

June 12, 2026

Last Modified

June 16, 2026

Advisory Details (2)

Auto-updated Jun 13, 2026
Patch available. Sources: github.
generic

OpenClaw < 2026.5.7 - Hostname Prefix Matching Bypass in Trusted Retry Endpoint Validation | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openclaw-hostname-prefix-matching-bypass-in-trusted-retry-endpoint-validation
github Patch Available

Trusted retry endpoint checks could match hostname prefixes · Advisory · openclaw/openclaw · GitHub

https://github.com/openclaw/openclaw/security/advisories/GHSA-77q5-rr5v-x43q

Vendor Advisories for CVE-2026-53839(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 24× in last 7d / 88× 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.

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

Frequently asked(5)

What is CVE-2026-53839?
CVE-2026-53839 is a medium vulnerability published on June 12, 2026. OpenClaw before 2026.5.7 contains a hostname validation vulnerability in retry endpoint checks that allows matching hostname prefixes instead of exact hostnames. Attackers can exploit this by crafting a hostname prefix resembling a trusted host to send authentication material to untrusted endpoints.
When was CVE-2026-53839 disclosed?
CVE-2026-53839 was first published in the National Vulnerability Database on June 12, 2026, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53839 actively exploited?
CVE-2026-53839 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 17.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-53839?
CVE-2026-53839 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-53839?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53839, 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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