CVE-2026-5773Public exploitNetwork attack vector

Incorrect file transfer via cross-share connection reuse

Published May 13, 2026 · Updated May 13, 2026

Incorrect SMB file transfer in curl 7.40.0 through 8.19.0 allows remote attackers to download from or upload to the wrong share. libcurl's connection-pool match omits the SMB share name, so a later transfer to the same server can reuse a connection bound to another share. Exploitation requires an application to make sequential SMBv1 transfers to different shares on one server with the same credentials; the result is retrieval of the wrong file or placement of an upload in the wrong location.

CVSS severity7.5
High
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect SMB file transfer in curl 7.40.0 through 8.19.0 allows remote attackers to download from or upload to the wrong share. libcurl's connection-pool match omits the SMB share name, so a later transfer to the same server can reuse a connection bound to another share. Exploitation requires an application to make sequential SMBv1 transfers to different shares on one server with the same credentials; the result is retrieval of the wrong file or placement of an upload in the wrong location.

The record

CVE
CVE-2026-5773
Published
May 13, 2026
Updated
May 13, 2026
Vendor
curl
Product
curl
Classifications
CWE-488
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 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=7.40.0 <=7.40.0
  2. Affected versionversion=7.41.0 <=7.41.0
  3. Affected versionversion=7.42.0 <=7.42.0
  4. Affected versionversion=7.42.1 <=7.42.1
  5. Affected versionversion=7.43.0 <=7.43.0
  6. Affected versionversion=7.44.0 <=7.44.0
  7. Affected versionversion=7.45.0 <=7.45.0
  8. Affected versionversion=7.46.0 <=7.46.0
  9. Affected versionversion=7.47.0 <=7.47.0
  10. Affected versionversion=7.47.1 <=7.47.1
  11. Affected versionversion=7.48.0 <=7.48.0
  12. Affected versionversion=7.49.0 <=7.49.0
  13. Affected versionversion=7.49.1 <=7.49.1
  14. Affected versionversion=7.50.0 <=7.50.0
  15. Affected versionversion=7.50.1 <=7.50.1
  16. Affected versionversion=7.50.2 <=7.50.2
  17. Affected versionversion=7.50.3 <=7.50.3
  18. Affected versionversion=7.51.0 <=7.51.0
  19. Affected versionversion=7.52.0 <=7.52.0
  20. Affected versionversion=7.52.1 <=7.52.1
  21. Affected versionversion=7.53.0 <=7.53.0
  22. Affected versionversion=7.53.1 <=7.53.1
  23. Affected versionversion=7.54.0 <=7.54.0
  24. Affected versionversion=7.54.1 <=7.54.1
  25. Affected versionversion=7.55.0 <=7.55.0
  26. Affected versionversion=7.55.1 <=7.55.1
  27. Affected versionversion=7.56.0 <=7.56.0
  28. Affected versionversion=7.56.1 <=7.56.1
  29. Affected versionversion=7.57.0 <=7.57.0
  30. Affected versionversion=7.58.0 <=7.58.0
  31. Affected versionversion=7.59.0 <=7.59.0
  32. Affected versionversion=7.60.0 <=7.60.0
  33. Affected versionversion=7.61.0 <=7.61.0
  34. Affected versionversion=7.61.1 <=7.61.1
  35. Affected versionversion=7.62.0 <=7.62.0
  36. Affected versionversion=7.63.0 <=7.63.0
  37. Affected versionversion=7.64.0 <=7.64.0
  38. Affected versionversion=7.64.1 <=7.64.1
  39. Affected versionversion=7.65.0 <=7.65.0
  40. Affected versionversion=7.65.1 <=7.65.1
  41. Affected versionversion=7.65.2 <=7.65.2
  42. Affected versionversion=7.65.3 <=7.65.3
  43. Affected versionversion=7.66.0 <=7.66.0
  44. Affected versionversion=7.67.0 <=7.67.0
  45. Affected versionversion=7.68.0 <=7.68.0
  46. Affected versionversion=7.69.0 <=7.69.0
  47. Affected versionversion=7.69.1 <=7.69.1
  48. Affected versionversion=7.70.0 <=7.70.0
  49. Affected versionversion=7.71.0 <=7.71.0
  50. Affected versionversion=7.71.1 <=7.71.1
  51. Affected versionversion=7.72.0 <=7.72.0
  52. Affected versionversion=7.73.0 <=7.73.0
  53. Affected versionversion=7.74.0 <=7.74.0
  54. Affected versionversion=7.75.0 <=7.75.0
  55. Affected versionversion=7.76.0 <=7.76.0
  56. Affected versionversion=7.76.1 <=7.76.1
  57. Affected versionversion=7.77.0 <=7.77.0
  58. Affected versionversion=7.78.0 <=7.78.0
  59. Affected versionversion=7.79.0 <=7.79.0
  60. Affected versionversion=7.79.1 <=7.79.1
  61. Affected versionversion=7.80.0 <=7.80.0
  62. Affected versionversion=7.81.0 <=7.81.0
  63. Affected versionversion=7.82.0 <=7.82.0
  64. Affected versionversion=7.83.0 <=7.83.0
  65. Affected versionversion=7.83.1 <=7.83.1
  66. Affected versionversion=7.84.0 <=7.84.0
  67. Affected versionversion=7.85.0 <=7.85.0
  68. Affected versionversion=7.86.0 <=7.86.0
  69. Affected versionversion=7.87.0 <=7.87.0
  70. Affected versionversion=7.88.0 <=7.88.0
  71. Affected versionversion=7.88.1 <=7.88.1
  72. Affected versionversion=8.0.0 <=8.0.0
  73. Affected versionversion=8.0.1 <=8.0.1
  74. Affected versionversion=8.10.0 <=8.10.0
  75. Affected versionversion=8.10.1 <=8.10.1
  76. Affected versionversion=8.1.0 <=8.1.0
  77. Affected versionversion=8.11.0 <=8.11.0
  78. Affected versionversion=8.11.1 <=8.11.1
  79. Affected versionversion=8.1.1 <=8.1.1
  80. Affected versionversion=8.12.0 <=8.12.0
  81. Affected versionversion=8.12.1 <=8.12.1
  82. Affected versionversion=8.1.2 <=8.1.2
  83. Affected versionversion=8.13.0 <=8.13.0
  84. Affected versionversion=8.14.0 <=8.14.0
  85. Affected versionversion=8.14.1 <=8.14.1
  86. Affected versionversion=8.15.0 <=8.15.0
  87. Affected versionversion=8.16.0 <=8.16.0
  88. Affected versionversion=8.17.0 <=8.17.0
  89. Affected versionversion=8.18.0 <=8.18.0
  90. Affected versionversion=8.19.0 <=8.19.0
  91. Affected versionversion=8.2.0 <=8.2.0
  92. Affected versionversion=8.2.1 <=8.2.1
  93. Affected versionversion=8.3.0 <=8.3.0
  94. Affected versionversion=8.4.0 <=8.4.0
  95. Affected versionversion=8.5.0 <=8.5.0
  96. Affected versionversion=8.6.0 <=8.6.0
  97. Affected versionversion=8.7.0 <=8.7.0
  98. Affected versionversion=8.7.1 <=8.7.1
  99. Affected versionversion=8.8.0 <=8.8.0
  100. Affected versionversion=8.9.0 <=8.9.0
  101. Affected versionversion=8.9.1 <=8.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=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=7.72.0 <=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=8.2.0 <=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

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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.

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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-488Exposure of Data Element to Wrong Session

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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