CVE-2026-8932Public exploitNetwork attack vector

mTLS identity confusion via incomplete connection matching

Published Jul 3, 2026 · Updated Jul 3, 2026

Authentication bypass in curl libcurl 7.7 through 8.20.0 allows attackers to make requests under a prior mTLS client identity. The connection and TLS-session matching logic omits SSLKEY, SSLKEYTYPE, KEYPASSWD, SSLCERTTYPE, and SSLKEYBLOB when comparing pooled handles. Exploitation requires shared connection-pool reuse between handles that differ only in those client-key settings, causing the later transfer to inherit the earlier authenticated identity.

CVSS severity7.5
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in curl libcurl 7.7 through 8.20.0 allows attackers to make requests under a prior mTLS client identity. The connection and TLS-session matching logic omits SSLKEY, SSLKEYTYPE, KEYPASSWD, SSLCERTTYPE, and SSLKEYBLOB when comparing pooled handles. Exploitation requires shared connection-pool reuse between handles that differ only in those client-key settings, causing the later transfer to inherit the earlier authenticated identity.

The record

CVE
CVE-2026-8932
Published
Jul 3, 2026
Updated
Jul 3, 2026
Vendor
curl
Product
curl
Classifications
CWE-305, T1550
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 3, 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=7.10.1 <=7.10.1
  2. Affected versionversion=7.10.2 <=7.10.2
  3. Affected versionversion=7.10.3 <=7.10.3
  4. Affected versionversion=7.10.4 <=7.10.4
  5. Affected versionversion=7.10.5 <=7.10.5
  6. Affected versionversion=7.10.6 <=7.10.6
  7. Affected versionversion=7.10 <=7.10
  8. Affected versionversion=7.10.7 <=7.10.7
  9. Affected versionversion=7.10.8 <=7.10.8
  10. Affected versionversion=7.11.0 <=7.11.0
  11. Affected versionversion=7.11.1 <=7.11.1
  12. Affected versionversion=7.11.2 <=7.11.2
  13. Affected versionversion=7.12.0 <=7.12.0
  14. Affected versionversion=7.12.1 <=7.12.1
  15. Affected versionversion=7.12.2 <=7.12.2
  16. Affected versionversion=7.12.3 <=7.12.3
  17. Affected versionversion=7.13.0 <=7.13.0
  18. Affected versionversion=7.13.1 <=7.13.1
  19. Affected versionversion=7.13.2 <=7.13.2
  20. Affected versionversion=7.14.0 <=7.14.0
  21. Affected versionversion=7.14.1 <=7.14.1
  22. Affected versionversion=7.15.0 <=7.15.0
  23. Affected versionversion=7.15.1 <=7.15.1
  24. Affected versionversion=7.15.2 <=7.15.2
  25. Affected versionversion=7.15.3 <=7.15.3
  26. Affected versionversion=7.15.4 <=7.15.4
  27. Affected versionversion=7.15.5 <=7.15.5
  28. Affected versionversion=7.16.0 <=7.16.0
  29. Affected versionversion=7.16.1 <=7.16.1
  30. Affected versionversion=7.16.2 <=7.16.2
  31. Affected versionversion=7.16.3 <=7.16.3
  32. Affected versionversion=7.16.4 <=7.16.4
  33. Affected versionversion=7.17.0 <=7.17.0
  34. Affected versionversion=7.17.1 <=7.17.1
  35. Affected versionversion=7.18.0 <=7.18.0
  36. Affected versionversion=7.18.1 <=7.18.1
  37. Affected versionversion=7.18.2 <=7.18.2
  38. Affected versionversion=7.19.0 <=7.19.0
  39. Affected versionversion=7.19.1 <=7.19.1
  40. Affected versionversion=7.19.2 <=7.19.2
  41. Affected versionversion=7.19.3 <=7.19.3
  42. Affected versionversion=7.19.4 <=7.19.4
  43. Affected versionversion=7.19.5 <=7.19.5
  44. Affected versionversion=7.19.6 <=7.19.6
  45. Affected versionversion=7.19.7 <=7.19.7
  46. Affected versionversion=7.20.0 <=7.20.0
  47. Affected versionversion=7.20.1 <=7.20.1
  48. Affected versionversion=7.21.0 <=7.21.0
  49. Affected versionversion=7.21.1 <=7.21.1
  50. Affected versionversion=7.21.2 <=7.21.2
  51. Affected versionversion=7.21.3 <=7.21.3
  52. Affected versionversion=7.21.4 <=7.21.4
  53. Affected versionversion=7.21.5 <=7.21.5
  54. Affected versionversion=7.21.6 <=7.21.6
  55. Affected versionversion=7.21.7 <=7.21.7
  56. Affected versionversion=7.22.0 <=7.22.0
  57. Affected versionversion=7.23.0 <=7.23.0
  58. Affected versionversion=7.23.1 <=7.23.1
  59. Affected versionversion=7.24.0 <=7.24.0
  60. Affected versionversion=7.25.0 <=7.25.0
  61. Affected versionversion=7.26.0 <=7.26.0
  62. Affected versionversion=7.27.0 <=7.27.0
  63. Affected versionversion=7.28.0 <=7.28.0
  64. Affected versionversion=7.28.1 <=7.28.1
  65. Affected versionversion=7.29.0 <=7.29.0
  66. Affected versionversion=7.30.0 <=7.30.0
  67. Affected versionversion=7.31.0 <=7.31.0
  68. Affected versionversion=7.32.0 <=7.32.0
  69. Affected versionversion=7.33.0 <=7.33.0
  70. Affected versionversion=7.34.0 <=7.34.0
  71. Affected versionversion=7.35.0 <=7.35.0
  72. Affected versionversion=7.36.0 <=7.36.0
  73. Affected versionversion=7.37.0 <=7.37.0
  74. Affected versionversion=7.37.1 <=7.37.1
  75. Affected versionversion=7.38.0 <=7.38.0
  76. Affected versionversion=7.39.0 <=7.39.0
  77. Affected versionversion=7.40.0 <=7.40.0
  78. Affected versionversion=7.41.0 <=7.41.0
  79. Affected versionversion=7.42.0 <=7.42.0
  80. Affected versionversion=7.42.1 <=7.42.1
  81. Affected versionversion=7.43.0 <=7.43.0
  82. Affected versionversion=7.44.0 <=7.44.0
  83. Affected versionversion=7.45.0 <=7.45.0
  84. Affected versionversion=7.46.0 <=7.46.0
  85. Affected versionversion=7.47.0 <=7.47.0
  86. Affected versionversion=7.47.1 <=7.47.1
  87. Affected versionversion=7.48.0 <=7.48.0
  88. Affected versionversion=7.49.0 <=7.49.0
  89. Affected versionversion=7.49.1 <=7.49.1
  90. Affected versionversion=7.50.0 <=7.50.0
  91. Affected versionversion=7.50.1 <=7.50.1
  92. Affected versionversion=7.50.2 <=7.50.2
  93. Affected versionversion=7.50.3 <=7.50.3
  94. Affected versionversion=7.51.0 <=7.51.0
  95. Affected versionversion=7.52.0 <=7.52.0
  96. Affected versionversion=7.52.1 <=7.52.1
  97. Affected versionversion=7.53.0 <=7.53.0
  98. Affected versionversion=7.53.1 <=7.53.1
  99. Affected versionversion=7.54.0 <=7.54.0
  100. Affected versionversion=7.54.1 <=7.54.1
  101. Affected versionversion=7.55.0 <=7.55.0
  102. Affected versionversion=7.55.1 <=7.55.1
  103. Affected versionversion=7.56.0 <=7.56.0
  104. Affected versionversion=7.56.1 <=7.56.1
  105. Affected versionversion=7.57.0 <=7.57.0
  106. Affected versionversion=7.58.0 <=7.58.0
  107. Affected versionversion=7.59.0 <=7.59.0
  108. Affected versionversion=7.60.0 <=7.60.0
  109. Affected versionversion=7.61.0 <=7.61.0
  110. Affected versionversion=7.61.1 <=7.61.1
  111. Affected versionversion=7.62.0 <=7.62.0
  112. Affected versionversion=7.63.0 <=7.63.0
  113. Affected versionversion=7.64.0 <=7.64.0
  114. Affected versionversion=7.64.1 <=7.64.1
  115. Affected versionversion=7.65.0 <=7.65.0
  116. Affected versionversion=7.65.1 <=7.65.1
  117. Affected versionversion=7.65.2 <=7.65.2
  118. Affected versionversion=7.65.3 <=7.65.3
  119. Affected versionversion=7.66.0 <=7.66.0
  120. Affected versionversion=7.67.0 <=7.67.0
  121. Affected versionversion=7.68.0 <=7.68.0
  122. Affected versionversion=7.69.0 <=7.69.0
  123. Affected versionversion=7.69.1 <=7.69.1
  124. Affected versionversion=7.70.0 <=7.70.0
  125. Affected versionversion=7.71.0 <=7.71.0
  126. Affected versionversion=7.71.1 <=7.71.1
  127. Affected versionversion=7.7.1 <=7.7.1
  128. Affected versionversion=7.72.0 <=7.72.0
  129. Affected versionversion=7.7.2 <=7.7.2
  130. Affected versionversion=7.73.0 <=7.73.0
  131. Affected versionversion=7.7.3 <=7.7.3
  132. Affected versionversion=7.74.0 <=7.74.0
  133. Affected versionversion=7.75.0 <=7.75.0
  134. Affected versionversion=7.76.0 <=7.76.0
  135. Affected versionversion=7.76.1 <=7.76.1
  136. Affected versionversion=7.77.0 <=7.77.0
  137. Affected versionversion=7.7 <=7.7
  138. Affected versionversion=7.78.0 <=7.78.0
  139. Affected versionversion=7.79.0 <=7.79.0
  140. Affected versionversion=7.79.1 <=7.79.1
  141. Affected versionversion=7.80.0 <=7.80.0
  142. Affected versionversion=7.81.0 <=7.81.0
  143. Affected versionversion=7.8.1 <=7.8.1
  144. Affected versionversion=7.82.0 <=7.82.0
  145. Affected versionversion=7.83.0 <=7.83.0
  146. Affected versionversion=7.83.1 <=7.83.1
  147. Affected versionversion=7.84.0 <=7.84.0
  148. Affected versionversion=7.85.0 <=7.85.0
  149. Affected versionversion=7.86.0 <=7.86.0
  150. Affected versionversion=7.87.0 <=7.87.0
  151. Affected versionversion=7.8 <=7.8
  152. Affected versionversion=7.88.0 <=7.88.0
  153. Affected versionversion=7.88.1 <=7.88.1
  154. Affected versionversion=7.9.1 <=7.9.1
  155. Affected versionversion=7.9.2 <=7.9.2
  156. Affected versionversion=7.9.3 <=7.9.3
  157. Affected versionversion=7.9.4 <=7.9.4
  158. Affected versionversion=7.9.5 <=7.9.5
  159. Affected versionversion=7.9.6 <=7.9.6
  160. Affected versionversion=7.9.7 <=7.9.7
  161. Affected versionversion=7.9 <=7.9
  162. Affected versionversion=7.9.8 <=7.9.8
  163. Affected versionversion=8.0.0 <=8.0.0
  164. Affected versionversion=8.0.1 <=8.0.1
  165. Affected versionversion=8.10.0 <=8.10.0
  166. Affected versionversion=8.10.1 <=8.10.1
  167. Affected versionversion=8.1.0 <=8.1.0
  168. Affected versionversion=8.11.0 <=8.11.0
  169. Affected versionversion=8.11.1 <=8.11.1
  170. Affected versionversion=8.1.1 <=8.1.1
  171. Affected versionversion=8.12.0 <=8.12.0
  172. Affected versionversion=8.12.1 <=8.12.1
  173. Affected versionversion=8.1.2 <=8.1.2
  174. Affected versionversion=8.13.0 <=8.13.0
  175. Affected versionversion=8.14.0 <=8.14.0
  176. Affected versionversion=8.14.1 <=8.14.1
  177. Affected versionversion=8.15.0 <=8.15.0
  178. Affected versionversion=8.16.0 <=8.16.0
  179. Affected versionversion=8.17.0 <=8.17.0
  180. Affected versionversion=8.18.0 <=8.18.0
  181. Affected versionversion=8.19.0 <=8.19.0
  182. Affected versionversion=8.20.0 <=8.20.0
  183. Affected versionversion=8.2.0 <=8.2.0
  184. Affected versionversion=8.2.1 <=8.2.1
  185. Affected versionversion=8.3.0 <=8.3.0
  186. Affected versionversion=8.4.0 <=8.4.0
  187. Affected versionversion=8.5.0 <=8.5.0
  188. Affected versionversion=8.6.0 <=8.6.0
  189. Affected versionversion=8.7.0 <=8.7.0
  190. Affected versionversion=8.7.1 <=8.7.1
  191. Affected versionversion=8.8.0 <=8.8.0
  192. Affected versionversion=8.9.0 <=8.9.0
  193. Affected versionversion=8.9.1 <=8.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=7.10.1 <=7.10.1; version=7.10.2 <=7.10.2; version=7.10.3 <=7.10.3; version=7.10.4 <=7.10.4; version=7.10.5 <=7.10.5; version=7.10.6 <=7.10.6; version=7.10 <=7.10; version=7.10.7 <=7.10.7; version=7.10.8 <=7.10.8; version=7.11.0 <=7.11.0; version=7.11.1 <=7.11.1; version=7.11.2 <=7.11.2; version=7.12.0 <=7.12.0; version=7.12.1 <=7.12.1; version=7.12.2 <=7.12.2; version=7.12.3 <=7.12.3; version=7.13.0 <=7.13.0; version=7.13.1 <=7.13.1; version=7.13.2 <=7.13.2; version=7.14.0 <=7.14.0; version=7.14.1 <=7.14.1; version=7.15.0 <=7.15.0; version=7.15.1 <=7.15.1; version=7.15.2 <=7.15.2; version=7.15.3 <=7.15.3; version=7.15.4 <=7.15.4; version=7.15.5 <=7.15.5; version=7.16.0 <=7.16.0; version=7.16.1 <=7.16.1; version=7.16.2 <=7.16.2; version=7.16.3 <=7.16.3; version=7.16.4 <=7.16.4; version=7.17.0 <=7.17.0; version=7.17.1 <=7.17.1; version=7.18.0 <=7.18.0; version=7.18.1 <=7.18.1; version=7.18.2 <=7.18.2; version=7.19.0 <=7.19.0; version=7.19.1 <=7.19.1; version=7.19.2 <=7.19.2; version=7.19.3 <=7.19.3; version=7.19.4 <=7.19.4; version=7.19.5 <=7.19.5; version=7.19.6 <=7.19.6; version=7.19.7 <=7.19.7; version=7.20.0 <=7.20.0; version=7.20.1 <=7.20.1; version=7.21.0 <=7.21.0; version=7.21.1 <=7.21.1; version=7.21.2 <=7.21.2; version=7.21.3 <=7.21.3; version=7.21.4 <=7.21.4; version=7.21.5 <=7.21.5; version=7.21.6 <=7.21.6; version=7.21.7 <=7.21.7; version=7.22.0 <=7.22.0; version=7.23.0 <=7.23.0; version=7.23.1 <=7.23.1; version=7.24.0 <=7.24.0; version=7.25.0 <=7.25.0; version=7.26.0 <=7.26.0; version=7.27.0 <=7.27.0; version=7.28.0 <=7.28.0; version=7.28.1 <=7.28.1; version=7.29.0 <=7.29.0; version=7.30.0 <=7.30.0; version=7.31.0 <=7.31.0; version=7.32.0 <=7.32.0; version=7.33.0 <=7.33.0; version=7.34.0 <=7.34.0; version=7.35.0 <=7.35.0; version=7.36.0 <=7.36.0; version=7.37.0 <=7.37.0; version=7.37.1 <=7.37.1; version=7.38.0 <=7.38.0; version=7.39.0 <=7.39.0; version=7.40.0 <=7.40.0; version=7.41.0 <=7.41.0; version=7.42.0 <=7.42.0; version=7.42.1 <=7.42.1; version=7.43.0 <=7.43.0; version=7.44.0 <=7.44.0; version=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=7.7.1 <=7.7.1; version=7.72.0 <=7.72.0; version=7.7.2 <=7.7.2; version=7.73.0 <=7.73.0; version=7.7.3 <=7.7.3; 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=7.7 <=7.7; 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=7.8.1 <=7.8.1; 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=7.8 <=7.8; version=7.88.0 <=7.88.0; version=7.88.1 <=7.88.1; version=7.9.1 <=7.9.1; version=7.9.2 <=7.9.2; version=7.9.3 <=7.9.3; version=7.9.4 <=7.9.4; version=7.9.5 <=7.9.5; version=7.9.6 <=7.9.6; version=7.9.7 <=7.9.7; version=7.9 <=7.9; version=7.9.8 <=7.9.8; 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=8.2.1 <=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

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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 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 exploitPublished

Weakness, pattern, technique

CWE-305Authentication Bypass by Primary Weakness
T1550Use Alternate Authentication Material

Public exploit references

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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