CVE-2025-26465

MEDIUMNVD 6.86.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

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, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this weekElevated
6.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 7.7%CVSS: 6.8Exploit: Public PoCExposed services: Not assessed

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.

CVSS v3
6.8
EG Score
6.8MEDIUMmedium confidence
EG Risk
47
EG Risk 47/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity68% × 45%
Impact severity (EG Severity): CVSS 6.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
7.7%
EPSS %ILE
94th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.8): severity, escalated by confirmed exploitation. This CVE's 6.8 is its impact severity (EG Severity), not escalated.

EG Severity
6.8 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
7.7% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-21). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

February 18, 2025

Last Modified

October 21, 2026

Advisory Details (10)

Auto-updated Jul 14, 2026
Patch available. Sources: redhat.
Web page

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

http://seclists.org/fulldisclosure/2025/May/7
Web page

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

http://seclists.org/fulldisclosure/2025/Feb/18
Web page

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

https://seclists.org/oss-sec/2025/q1/144
Red HatMentions a patch (unverified)

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
Red HatMentions a patch (unverified)

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
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2025-26465
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2025:8385
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2025:6993
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.4 Extended Update Support.

https://access.redhat.com/errata/RHSA-2025:3837
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 8.

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

Patch Availability(6)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntussh-askpass-gnome (1:9.7p1-7ubuntu4.2) @ oracular2026-10-21ubuntu
ubuntussh-askpass-gnome (1:7.6p1-4ubuntu0.7+esm4) @ bionic2026-10-21ubuntu
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.

Affected Packages

(11 across 11 ecosystems)
Alpine:v3.18(1)
PackageVulnerable rangeFix by version rangeDependents
openssh—
  • 6.9 up to 9.3_p2-r3: fixed in 9.3_p2-r3
—
Alpine:v3.19(1)
PackageVulnerable rangeFix by version rangeDependents
openssh—
  • 6.9 up to 9.6_p1-r2: fixed in 9.6_p1-r2
—
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
openssh—
  • 6.9 up to 9.7_p1-r5: fixed in 9.7_p1-r5
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
openssh—
  • 6.9 up to 9.9_p2-r0: fixed in 9.9_p2-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
openssh—
  • 6.9 up to 9.9_p2-r0: fixed in 9.9_p2-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
openssh—
  • 6.9 up to 9.9_p2-r0: fixed in 9.9_p2-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
openssh—
  • 6.9 up to 9.9_p2-r0: fixed in 9.9_p2-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
openssh1:8.4p1-5, 1:8.4p1-5+deb11u1, 1:8.4p1-5+deb11u2, 1:8.4p1-5+deb11u3
  • every version up to 1:8.4p1-5+deb11u4: fixed in 1:8.4p1-5+deb11u4
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
openssh1:9.2p1-2, 1:9.2p1-2+deb12u1, 1:9.2p1-2+deb12u2, 1:9.2p1-2+deb12u3, 1:9.2p1-2+deb12u4
  • every version up to 1:9.2p1-2+deb12u5: fixed in 1:9.2p1-2+deb12u5
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
openssh—
  • every version up to 1:9.9p2-1: fixed in 1:9.9p2-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
openssh—
  • every version up to 1:9.9p2-1: fixed in 1:9.9p2-1
—

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 16× in last 7d / 44× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 96 of 211 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 4 repeat rows among the latest 100 are merged into the row they repeat. The 115 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-23 16:30 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  2. 2026-10-22 16:32 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  3. 2026-10-21 21:35 UTCVendor advisory
  4. 2026-10-21 21:34 UTCGHSA enrichmentGHSA-jrwv-mv4h-7rrq · GitHub CVSS 6.8
  5. 2026-10-21 20:26 UTCVendor advisory
  6. 2026-10-21 20:26 UTCGHSA enrichmentGHSA-jrwv-mv4h-7rrq · GitHub CVSS 6.8
  7. 2026-10-21 17:28 UTCVendor advisory
  8. 2026-10-21 17:28 UTCGHSA enrichmentGHSA-jrwv-mv4h-7rrq · GitHub CVSS 6.8
  9. 2026-10-21 17:13 UTCEG score recompute
  10. 2026-10-21 17:13 UTCVendor advisory
  11. 2026-10-21 17:13 UTCGHSA enrichmentGHSA-jrwv-mv4h-7rrq · GitHub CVSS 6.8
  12. 2026-10-21 16:30 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  13. 2026-10-20 16:31 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  14. 2026-10-19 16:30 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  15. 2026-10-18 05:42 UTCEG score recompute
  16. 2026-10-17 16:32 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  17. 2026-10-16 16:38 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  18. 2026-10-15 16:30 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  19. 2026-10-15 02:00 UTCEG score recompute
  20. 2026-10-15 02:00 UTCVendor advisory
  21. 2026-10-15 01:59 UTCGHSA enrichmentGHSA-jrwv-mv4h-7rrq · GitHub CVSS 6.8
  22. 2026-10-14 16:31 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  23. 2026-10-13 16:32 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  24. 2026-10-12 17:15 UTCEG score recompute
  25. 2026-10-12 16:32 UTCEPSS rescoreEPSS 7.7% · 94th percentile
Show 71 more
  1. 2026-10-11 20:47 UTCEG score recompute
  2. 2026-10-11 18:57 UTCEG score recompute
  3. 2026-10-11 15:36 UTCEG score recompute
  4. 2026-10-11 13:47 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  5. 2026-10-10 19:59 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  6. 2026-10-10 17:03 UTCOSV refresh
  7. 2026-10-09 20:06 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  8. 2026-10-08 17:09 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  9. 2026-10-07 23:46 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  10. 2026-10-06 15:16 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  11. 2026-10-05 17:42 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  12. 2026-10-04 23:21 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  13. 2026-10-03 14:24 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  14. 2026-10-02 16:26 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  15. 2026-10-01 19:48 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  16. 2026-09-30 15:02 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  17. 2026-09-28 13:50 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  18. 2026-09-26 15:58 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  19. 2026-09-26 00:24 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  20. 2026-09-24 14:02 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  21. 2026-09-23 13:46 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  22. 2026-09-22 14:47 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  23. 2026-09-21 04:19 UTCOSV refresh
  24. 2026-09-20 20:15 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  25. 2026-09-18 19:27 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  26. 2026-09-16 14:06 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  27. 2026-09-16 05:13 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  28. 2026-09-15 03:09 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  29. 2026-09-13 16:46 UTCEPSS rescoreEPSS 7.7% · 94th percentile
  30. 2026-09-12 15:00 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  31. 2026-09-11 14:51 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  32. 2026-09-11 09:35 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  33. 2026-09-10 09:33 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  34. 2026-09-08 21:59 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  35. 2026-09-07 16:00 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  36. 2026-09-06 13:46 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  37. 2026-09-05 15:28 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  38. 2026-09-04 05:05 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  39. 2026-09-02 14:11 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  40. 2026-09-02 02:31 UTCVendor advisory
  41. 2026-09-02 02:31 UTCGHSA enrichmentGHSA-jrwv-mv4h-7rrq · GitHub CVSS 6.8
  42. 2026-09-02 02:05 UTCEG score recompute
  43. 2026-09-02 02:05 UTCVendor advisory
  44. 2026-09-02 02:04 UTCGHSA enrichmentGHSA-jrwv-mv4h-7rrq · GitHub CVSS 6.8
  45. 2026-09-01 13:52 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  46. 2026-09-01 04:38 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  47. 2026-08-30 19:16 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  48. 2026-08-30 01:21 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  49. 2026-08-29 06:43 UTCOSV refresh
  50. 2026-08-28 21:40 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  51. 2026-08-27 14:24 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  52. 2026-08-25 13:47 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  53. 2026-08-23 00:18 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  54. 2026-08-21 23:48 UTCEPSS rescoreEPSS 7.6% · 94th percentile
  55. 2026-08-20 22:54 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  56. 2026-08-19 17:03 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  57. 2026-08-18 13:47 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  58. 2026-08-17 13:46 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  59. 2026-08-16 14:55 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  60. 2026-08-16 02:13 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  61. 2026-08-15 01:29 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  62. 2026-08-13 21:59 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  63. 2026-08-12 18:13 UTCOSV refresh
  64. 2026-08-12 13:50 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  65. 2026-08-10 23:59 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  66. 2026-08-09 13:45 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  67. 2026-08-07 16:26 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  68. 2026-08-06 13:46 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  69. 2026-08-05 19:16 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  70. 2026-08-04 15:09 UTCEPSS rescoreEPSS 7.4% · 93rd percentile
  71. 2026-08-04 10:37 UTCEPSS rescoreEPSS 7.4% · 93rd percentile

Publicly available exploits

(1 reference)

Public exploit code is referenced for this CVE (1 GitHub PoC). Defenders should treat patch urgency accordingly.

  • GitHub PoCrxerium/CVE-2025-26465
    Published 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-severity vulnerability; its CVE record was 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 made public?
CVE-2025-26465 was made public on February 17, 2025: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on February 18, 2025. EchelonGraph's copy of the record carries a last-modified date of October 21, 2026; the record at its source may have been updated since.
Is CVE-2025-26465 actively exploited?
CVE-2025-26465 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 7.7% probability of exploitation in the next 30 days (94th percentile of EPSS-scored CVEs).
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?
A fix for CVE-2025-26465 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-26465 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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