CVE-2026-9547

HIGHPre-NVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-07-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — Patch released this weekElevated
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: Elevated riskExposed: 0

A fix is available — apply it.

When a libcurl-based application performs transfers via SCP:// or SFTP:// and utilizes the CURLOPT_SSH_KEYFUNCTION callback, it may silently accept an untrusted server. This vulnerability occurs when a server presents a host key type that does not match the specific key type already recorded for that host in the known_hosts file. Instead of rejecting the mismatch, the callback mechanism fails to properly enforce the restriction, allowing the connection to succeed without warning and risking a potential man-in-the-middle attack.

CVSS v3
7.4
EG Score
7.4(medium)
EG Risk
49(Track*)
EG Risk 49/100SSVC: 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
Severity74% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

July 3, 2026

Last Modified

September 15, 2026

Advisory Details (3)

Auto-updated Jul 7, 2026
No patch confirmed yet.
generic

HackerOne

https://hackerone.com/reports/3751712
generic
https://curl.se/docs/CVE-2026-9547.json
generic

curl - SSH improper host validation - CVE-2026-9547

https://curl.se/docs/CVE-2026-9547.html

Vendor Advisories for CVE-2026-9547(15)

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

Patch Availability(15)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibcurl4t64 (8.14.1-2ubuntu1.4) @ questing2026-09-18ubuntu
redhatrhcos-4.22.9.8.202609081748-02026-09-15redhat
redhatrhui5/rhua-rhel9:17888805812026-09-09redhat
redhatcert-manager/jetstack-cert-manager-rhel9:17883485712026-09-03redhat
redhatcert-manager/cert-manager-operator-rhel9:17883485222026-09-03redhat
redhatcert-manager/cert-manager-istio-csr-rhel9:17883485942026-09-03redhat
redhatrhcos-4.22.9.8.202608251819-02026-09-01redhat
redhatdevspaces/code-rhel9:17877627932026-09-01redhat
redhatdiscovery/discovery-ui-rhel9:17882061962026-08-31redhat
redhatrhui5/rhua-tp-rhel9:17872412602026-08-24redhat
redhatpatch2026-08-19redhat
redhatcurl-0:7.76.1-40.el9_8.52026-08-17redhat
redhatcurl-0:8.12.1-4.el10_2.32026-08-17redhat
redhatrust-main-1.96.1-1.hum12026-07-02redhat
redhatcurl-main-8.21.0-0.1.hum12026-06-24redhat

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

(6 across 6 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
curl—8.22.0-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
curl—8.21.0-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
curl7.74.0-1.3 ... 8.9.1-2~bpo12+1 (219 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
curl7.88.1-10 ... 8.9.1-2~bpo12+1 (178 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
curl8.14.1-2 ... 8.22.0~rc3-1+exp1 (78 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
curl8.14.1-2 ... 8.21.0~rc1-1+exp1 (59 versions)8.21.0~rc2-1—

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 24× in last 7d / 86× 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 301 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-9547?
CVE-2026-9547 is a high vulnerability published on July 3, 2026. When a libcurl-based application performs transfers via SCP:// or SFTP:// and utilizes the CURLOPTSSHKEYFUNCTION callback, it may silently accept an untrusted server. This vulnerability occurs when a server presents a host key type that does not match the specific key type already recorded for that…
When was CVE-2026-9547 disclosed?
CVE-2026-9547 was first published in the National Vulnerability Database on July 3, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9547 actively exploited?
CVE-2026-9547 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 74.2% of all scored CVEs.
What is the CVSS score of CVE-2026-9547?
CVE-2026-9547 has a CVSS v3.1 base score of 7.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-9547?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9547, 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-2026-9547

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