CVE-2026-80230Network attack vector

Unauthenticated TLS interception via skipped pin check

Published Sep 6, 2026 · Updated Sep 8, 2026

Improper certificate validation in curl allows remote attackers to bypass public-key pinning during OpenSSL-family TLS setup. Curl_ossl_check_peer_cert accepts a missing server certificate when peer and host verification are disabled without first rejecting a configured pin. Exploitation requires all three options and a nondefault TLS setup that permits no server certificate, allowing an unauthenticated endpoint to be accepted.

CVSS severityUnavailable
Unscored
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in curl allows remote attackers to bypass public-key pinning during OpenSSL-family TLS setup. Curl_ossl_check_peer_cert accepts a missing server certificate when peer and host verification are disabled without first rejecting a configured pin. Exploitation requires all three options and a nondefault TLS setup that permits no server certificate, allowing an unauthenticated endpoint to be accepted.

The record

CVE
CVE-2026-80230
Published
Sep 6, 2026
Updated
Sep 8, 2026
Vendor
curl
Product
curl
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 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=7.45.0 <=7.45.0
  2. Affected versionversion=7.46.0 <=7.46.0
  3. Affected versionversion=7.47.0 <=7.47.0
  4. Affected versionversion=7.47.1 <=7.47.1
  5. Affected versionversion=7.48.0 <=7.48.0
  6. Affected versionversion=7.49.0 <=7.49.0
  7. Affected versionversion=7.49.1 <=7.49.1
  8. Affected versionversion=7.50.0 <=7.50.0
  9. Affected versionversion=7.50.1 <=7.50.1
  10. Affected versionversion=7.50.2 <=7.50.2
  11. Affected versionversion=7.50.3 <=7.50.3
  12. Affected versionversion=7.51.0 <=7.51.0
  13. Affected versionversion=7.52.0 <=7.52.0
  14. Affected versionversion=7.52.1 <=7.52.1
  15. Affected versionversion=7.53.0 <=7.53.0
  16. Affected versionversion=7.53.1 <=7.53.1
  17. Affected versionversion=7.54.0 <=7.54.0
  18. Affected versionversion=7.54.1 <=7.54.1
  19. Affected versionversion=7.55.0 <=7.55.0
  20. Affected versionversion=7.55.1 <=7.55.1
  21. Affected versionversion=7.56.0 <=7.56.0
  22. Affected versionversion=7.56.1 <=7.56.1
  23. Affected versionversion=7.57.0 <=7.57.0
  24. Affected versionversion=7.58.0 <=7.58.0
  25. Affected versionversion=7.59.0 <=7.59.0
  26. Affected versionversion=7.60.0 <=7.60.0
  27. Affected versionversion=7.61.0 <=7.61.0
  28. Affected versionversion=7.61.1 <=7.61.1
  29. Affected versionversion=7.62.0 <=7.62.0
  30. Affected versionversion=7.63.0 <=7.63.0
  31. Affected versionversion=7.64.0 <=7.64.0
  32. Affected versionversion=7.64.1 <=7.64.1
  33. Affected versionversion=7.65.0 <=7.65.0
  34. Affected versionversion=7.65.1 <=7.65.1
  35. Affected versionversion=7.65.2 <=7.65.2
  36. Affected versionversion=7.65.3 <=7.65.3
  37. Affected versionversion=7.66.0 <=7.66.0
  38. Affected versionversion=7.67.0 <=7.67.0
  39. Affected versionversion=7.68.0 <=7.68.0
  40. Affected versionversion=7.69.0 <=7.69.0
  41. Affected versionversion=7.69.1 <=7.69.1
  42. Affected versionversion=7.70.0 <=7.70.0
  43. Affected versionversion=7.71.0 <=7.71.0
  44. Affected versionversion=7.71.1 <=7.71.1
  45. Affected versionversion=7.72.0 <=7.72.0
  46. Affected versionversion=7.73.0 <=7.73.0
  47. Affected versionversion=7.74.0 <=7.74.0
  48. Affected versionversion=7.75.0 <=7.75.0
  49. Affected versionversion=7.76.0 <=7.76.0
  50. Affected versionversion=7.76.1 <=7.76.1
  51. Affected versionversion=7.77.0 <=7.77.0
  52. Affected versionversion=7.78.0 <=7.78.0
  53. Affected versionversion=7.79.0 <=7.79.0
  54. Affected versionversion=7.79.1 <=7.79.1
  55. Affected versionversion=7.80.0 <=7.80.0
  56. Affected versionversion=7.81.0 <=7.81.0
  57. Affected versionversion=7.82.0 <=7.82.0
  58. Affected versionversion=7.83.0 <=7.83.0
  59. Affected versionversion=7.83.1 <=7.83.1
  60. Affected versionversion=7.84.0 <=7.84.0
  61. Affected versionversion=7.85.0 <=7.85.0
  62. Affected versionversion=7.86.0 <=7.86.0
  63. Affected versionversion=7.87.0 <=7.87.0
  64. Affected versionversion=7.88.0 <=7.88.0
  65. Affected versionversion=7.88.1 <=7.88.1
  66. Affected versionversion=8.0.0 <=8.0.0
  67. Affected versionversion=8.0.1 <=8.0.1
  68. Affected versionversion=8.10.0 <=8.10.0
  69. Affected versionversion=8.10.1 <=8.10.1
  70. Affected versionversion=8.1.0 <=8.1.0
  71. Affected versionversion=8.11.0 <=8.11.0
  72. Affected versionversion=8.11.1 <=8.11.1
  73. Affected versionversion=8.1.1 <=8.1.1
  74. Affected versionversion=8.12.0 <=8.12.0
  75. Affected versionversion=8.12.1 <=8.12.1
  76. Affected versionversion=8.1.2 <=8.1.2
  77. Affected versionversion=8.13.0 <=8.13.0
  78. Affected versionversion=8.14.0 <=8.14.0
  79. Affected versionversion=8.14.1 <=8.14.1
  80. Affected versionversion=8.15.0 <=8.15.0
  81. Affected versionversion=8.16.0 <=8.16.0
  82. Affected versionversion=8.17.0 <=8.17.0
  83. Affected versionversion=8.18.0 <=8.18.0
  84. Affected versionversion=8.19.0 <=8.19.0
  85. Affected versionversion=8.20.0 <=8.20.0
  86. Affected versionversion=8.2.0 <=8.2.0
  87. Affected versionversion=8.21.0 <=8.21.0
  88. Affected versionversion=8.2.1 <=8.2.1
  89. Affected versionversion=8.3.0 <=8.3.0
  90. Affected versionversion=8.4.0 <=8.4.0
  91. Affected versionversion=8.5.0 <=8.5.0
  92. Affected versionversion=8.6.0 <=8.6.0
  93. Affected versionversion=8.7.0 <=8.7.0
  94. Affected versionversion=8.7.1 <=8.7.1
  95. Affected versionversion=8.8.0 <=8.8.0
  96. Affected versionversion=8.9.0 <=8.9.0
  97. Affected versionversion=8.9.1 <=8.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=7.45.0 <=7.45.0; version=7.46.0 <=7.46.0; version=7.47.0 <=7.47.0; version=7.47.1 <=7.47.1; version=7.48.0 <=7.48.0; version=7.49.0 <=7.49.0; version=7.49.1 <=7.49.1; version=7.50.0 <=7.50.0; version=7.50.1 <=7.50.1; version=7.50.2 <=7.50.2; version=7.50.3 <=7.50.3; version=7.51.0 <=7.51.0; version=7.52.0 <=7.52.0; version=7.52.1 <=7.52.1; version=7.53.0 <=7.53.0; version=7.53.1 <=7.53.1; version=7.54.0 <=7.54.0; version=7.54.1 <=7.54.1; version=7.55.0 <=7.55.0; version=7.55.1 <=7.55.1; version=7.56.0 <=7.56.0; version=7.56.1 <=7.56.1; version=7.57.0 <=7.57.0; version=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=8.18.0 <=8.18.0; version=8.19.0 <=8.19.0; version=8.20.0 <=8.20.0; version=8.2.0 <=8.2.0; version=8.21.0 <=8.21.0; 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

No CVSS assessment is available in this record.

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

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