CVE-2025-26465

MEDIUMNVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

Score 6.8 from GitHub Security Advisory published 2025-02-18. NVD baseline CVSS 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
6.8
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • 11 internet-exposed hosts are running an affected version right now
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 7%CVSS: 6.8Exploit: NoneExposed: 11

A fix is available — apply it.

A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high.

Live · internet exposure

11 internet-exposed hosts are running an affected version of CVE-2025-26465 right now.

across 5 countries (France, China, Austria, Germany, United States)top: openssh
See the live KEV-Exposure radar →Found passively from public internet-scan data — aggregate, host-redacted.

EchelonGraph is the only CVE feed that fuses live vulnerability intelligence with its own live internet-exposure radar — so you see not just that a CVE is exploited, but how much of the internet is exposed to it right now.

CVSS v3
6.8
EG Score
6.8(medium)
EPSS
93.8%
KEV
Not listed

Published

February 18, 2025

Last Modified

July 14, 2026

Advisory Details (10)

Auto-updated Jul 14, 2026
🔬 Proof of concept available. Patch available. Sources: redhat.
generic

Full Disclosure: APPLE-SA-05-12-2025-3 macOS Sequoia 15.5

http://seclists.org/fulldisclosure/2025/May/7
generic🟡 PoC Available

Full Disclosure: Re: MitM attack against OpenSSH's VerifyHostKeyDNS-enabled client

http://seclists.org/fulldisclosure/2025/Feb/18
generic🟡 PoC Available

oss-sec: MitM attack against OpenSSH's VerifyHostKeyDNS-enabled client

https://seclists.org/oss-sec/2025/q1/144
redhat Patch Available

2344780 – (CVE-2025-26465) CVE-2025-26465 openssh: Machine-in-the-middle attack if VerifyHostKeyDNS is enabled

Affected: Red Hat Enterprise Linux 9 openssh Affected

https://bugzilla.redhat.com/show_bug.cgi?id=2344780
redhat Patch Available

How to apply mitigation for CVE-2025-26465? - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 7 and higher

https://access.redhat.com/solutions/7109879
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2025-26465
redhat Patch Available
https://access.redhat.com/errata/RHSA-2025:8385
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2025:6993
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.4 Extended Update Support.

https://access.redhat.com/errata/RHSA-2025:3837
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2025:16823

Vendor Advisories for CVE-2025-26465(5)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntussh-askpass-gnome (1:9.7p1-7ubuntu4.2) @ oracular2026-05-21ubuntu
ubuntussh-krb5 (1:7.2p2-4ubuntu2.10+esm7) @ xenial2026-05-21ubuntu
redhatopenssh-0:8.0p1-26.el8_102025-09-26redhat
redhatdiscovery/discovery-server-rhel9:1.14.3-17485292792025-06-02redhat
redhatopenssh-0:8.7p1-45.el92025-05-13redhat
redhatopenssh-0:8.7p1-38.el9_4.52025-04-14redhat

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.

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 42× 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 102 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCrxerium/CVE-2025-26465
    First seen Feb 18, 2025

    MitM attack allowing a malicious interloper to impersonate a legitimate server when a client attempts to connect to it

    Open source ↗

Frequently asked(5)

What is CVE-2025-26465?
CVE-2025-26465 is a medium vulnerability published on February 18, 2025. A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For…
When was CVE-2025-26465 disclosed?
CVE-2025-26465 was first published in the National Vulnerability Database on February 18, 2025, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-26465 actively exploited?
CVE-2025-26465 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 93.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-26465?
CVE-2025-26465 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2025-26465?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-26465, 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

Explore the affected products and dependency analysis for CVE-2025-26465

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