CVE-2025-15079Public exploitNetwork attack vector

Host impersonation via global known_hosts fallback

Published Jan 8, 2026 · Updated Jan 8, 2026

Improper SSH host verification in curl 7.58.0 through 8.17.0 allows man-in-the-middle attackers to impersonate SCP or SFTP hosts. With the libssh backend, libcurl sets a custom known_hosts file but leaves libssh's build-time global file enabled, so a host absent from the custom file is accepted when it appears globally. Exploitation requires a configured known_hosts file, a libssh-based build, user interaction to start the transfer, and a network position able to intercept it; the result is unauthorized trust in the attacker's SSH host.

CVSS severity5.3
Medium
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper SSH host verification in curl 7.58.0 through 8.17.0 allows man-in-the-middle attackers to impersonate SCP or SFTP hosts. With the libssh backend, libcurl sets a custom known_hosts file but leaves libssh's build-time global file enabled, so a host absent from the custom file is accepted when it appears globally. Exploitation requires a configured known_hosts file, a libssh-based build, user interaction to start the transfer, and a network position able to intercept it; the result is unauthorized trust in the attacker's SSH host.

The record

CVE
CVE-2025-15079
Published
Jan 8, 2026
Updated
Jan 8, 2026
Vendor
curl
Product
curl
Classifications
CWE-297, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.58.0 <=7.58.0
  2. Affected versionversion=7.59.0 <=7.59.0
  3. Affected versionversion=7.60.0 <=7.60.0
  4. Affected versionversion=7.61.0 <=7.61.0
  5. Affected versionversion=7.61.1 <=7.61.1
  6. Affected versionversion=7.62.0 <=7.62.0
  7. Affected versionversion=7.63.0 <=7.63.0
  8. Affected versionversion=7.64.0 <=7.64.0
  9. Affected versionversion=7.64.1 <=7.64.1
  10. Affected versionversion=7.65.0 <=7.65.0
  11. Affected versionversion=7.65.1 <=7.65.1
  12. Affected versionversion=7.65.2 <=7.65.2
  13. Affected versionversion=7.65.3 <=7.65.3
  14. Affected versionversion=7.66.0 <=7.66.0
  15. Affected versionversion=7.67.0 <=7.67.0
  16. Affected versionversion=7.68.0 <=7.68.0
  17. Affected versionversion=7.69.0 <=7.69.0
  18. Affected versionversion=7.69.1 <=7.69.1
  19. Affected versionversion=7.70.0 <=7.70.0
  20. Affected versionversion=7.71.0 <=7.71.0
  21. Affected versionversion=7.71.1 <=7.71.1
  22. Affected versionversion=7.72.0 <=7.72.0
  23. Affected versionversion=7.73.0 <=7.73.0
  24. Affected versionversion=7.74.0 <=7.74.0
  25. Affected versionversion=7.75.0 <=7.75.0
  26. Affected versionversion=7.76.0 <=7.76.0
  27. Affected versionversion=7.76.1 <=7.76.1
  28. Affected versionversion=7.77.0 <=7.77.0
  29. Affected versionversion=7.78.0 <=7.78.0
  30. Affected versionversion=7.79.0 <=7.79.0
  31. Affected versionversion=7.79.1 <=7.79.1
  32. Affected versionversion=7.80.0 <=7.80.0
  33. Affected versionversion=7.81.0 <=7.81.0
  34. Affected versionversion=7.82.0 <=7.82.0
  35. Affected versionversion=7.83.0 <=7.83.0
  36. Affected versionversion=7.83.1 <=7.83.1
  37. Affected versionversion=7.84.0 <=7.84.0
  38. Affected versionversion=7.85.0 <=7.85.0
  39. Affected versionversion=7.86.0 <=7.86.0
  40. Affected versionversion=7.87.0 <=7.87.0
  41. Affected versionversion=7.88.0 <=7.88.0
  42. Affected versionversion=7.88.1 <=7.88.1
  43. Affected versionversion=8.0.0 <=8.0.0
  44. Affected versionversion=8.0.1 <=8.0.1
  45. Affected versionversion=8.10.0 <=8.10.0
  46. Affected versionversion=8.10.1 <=8.10.1
  47. Affected versionversion=8.1.0 <=8.1.0
  48. Affected versionversion=8.11.0 <=8.11.0
  49. Affected versionversion=8.11.1 <=8.11.1
  50. Affected versionversion=8.1.1 <=8.1.1
  51. Affected versionversion=8.12.0 <=8.12.0
  52. Affected versionversion=8.12.1 <=8.12.1
  53. Affected versionversion=8.1.2 <=8.1.2
  54. Affected versionversion=8.13.0 <=8.13.0
  55. Affected versionversion=8.14.0 <=8.14.0
  56. Affected versionversion=8.14.1 <=8.14.1
  57. Affected versionversion=8.15.0 <=8.15.0
  58. Affected versionversion=8.16.0 <=8.16.0
  59. Affected versionversion=8.17.0 <=8.17.0
  60. Affected versionversion=8.2.0 <=8.2.0
  61. Affected versionversion=8.2.1 <=8.2.1
  62. Affected versionversion=8.3.0 <=8.3.0
  63. Affected versionversion=8.4.0 <=8.4.0
  64. Affected versionversion=8.5.0 <=8.5.0
  65. Affected versionversion=8.6.0 <=8.6.0
  66. Affected versionversion=8.7.0 <=8.7.0
  67. Affected versionversion=8.7.1 <=8.7.1
  68. Affected versionversion=8.8.0 <=8.8.0
  69. Affected versionversion=8.9.0 <=8.9.0
  70. Affected versionversion=8.9.1 <=8.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=7.58.0 <=7.58.0; version=7.59.0 <=7.59.0; version=7.60.0 <=7.60.0; version=7.61.0 <=7.61.0; version=7.61.1 <=7.61.1; version=7.62.0 <=7.62.0; version=7.63.0 <=7.63.0; version=7.64.0 <=7.64.0; version=7.64.1 <=7.64.1; version=7.65.0 <=7.65.0; version=7.65.1 <=7.65.1; version=7.65.2 <=7.65.2; version=7.65.3 <=7.65.3; version=7.66.0 <=7.66.0; version=7.67.0 <=7.67.0; version=7.68.0 <=7.68.0; version=7.69.0 <=7.69.0; version=7.69.1 <=7.69.1; version=7.70.0 <=7.70.0; version=7.71.0 <=7.71.0; version=7.71.1 <=7.71.1; version=7.72.0 <=7.72.0; version=7.73.0 <=7.73.0; version=7.74.0 <=7.74.0; version=7.75.0 <=7.75.0; version=7.76.0 <=7.76.0; version=7.76.1 <=7.76.1; version=7.77.0 <=7.77.0; version=7.78.0 <=7.78.0; version=7.79.0 <=7.79.0; version=7.79.1 <=7.79.1; version=7.80.0 <=7.80.0; version=7.81.0 <=7.81.0; version=7.82.0 <=7.82.0; version=7.83.0 <=7.83.0; version=7.83.1 <=7.83.1; version=7.84.0 <=7.84.0; version=7.85.0 <=7.85.0; version=7.86.0 <=7.86.0; version=7.87.0 <=7.87.0; version=7.88.0 <=7.88.0; version=7.88.1 <=7.88.1; version=8.0.0 <=8.0.0; version=8.0.1 <=8.0.1; version=8.10.0 <=8.10.0; version=8.10.1 <=8.10.1; version=8.1.0 <=8.1.0; version=8.11.0 <=8.11.0; version=8.11.1 <=8.11.1; version=8.1.1 <=8.1.1; version=8.12.0 <=8.12.0; version=8.12.1 <=8.12.1; version=8.1.2 <=8.1.2; version=8.13.0 <=8.13.0; version=8.14.0 <=8.14.0; version=8.14.1 <=8.14.1; version=8.15.0 <=8.15.0; version=8.16.0 <=8.16.0; version=8.17.0 <=8.17.0; version=8.2.0 <=8.2.0; version=8.2.1 <=8.2.1; version=8.3.0 <=8.3.0; version=8.4.0 <=8.4.0; version=8.5.0 <=8.5.0; version=8.6.0 <=8.6.0; version=8.7.0 <=8.7.0; version=8.7.1 <=8.7.1; version=8.8.0 <=8.8.0; version=8.9.0 <=8.9.0; version=8.9.1 <=8.9.1

Published CVSS scores

5.3CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-297Improper Validation of Certificate with Host Mismatch
T1557Adversary-in-the-Middle

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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