CVE-2026-8924Public exploitNetwork attack vector

Cross-domain cookie disclosure via trailing-dot PSL bypass

Published Jul 3, 2026 · Updated Jul 3, 2026

Information exposure in curl 7.46.0 through 8.20.0 allows remote attackers to send cookies to unrelated domains via malicious HTTP responses. The is_public_suffix function in lib/cookie.c passes trailing-dot host and cookie domains to the PSL check without first removing the terminal dots, so the comparison accepts a public-suffix cookie. Exploitation requires curl to use a trailing-dot URL and cookie handling in a PSL-enabled build; the injected cookie is then disclosed to unrelated third-party domains.

CVSS severity9.1
Critical
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in curl 7.46.0 through 8.20.0 allows remote attackers to send cookies to unrelated domains via malicious HTTP responses. The is_public_suffix function in lib/cookie.c passes trailing-dot host and cookie domains to the PSL check without first removing the terminal dots, so the comparison accepts a public-suffix cookie. Exploitation requires curl to use a trailing-dot URL and cookie handling in a PSL-enabled build; the injected cookie is then disclosed to unrelated third-party domains.

The record

CVE
CVE-2026-8924
Published
Jul 3, 2026
Updated
Jul 3, 2026
Vendor
curl
Product
curl
Classifications
CWE-201
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=7.46.0 <=7.46.0
  2. Affected versionversion=7.47.0 <=7.47.0
  3. Affected versionversion=7.47.1 <=7.47.1
  4. Affected versionversion=7.48.0 <=7.48.0
  5. Affected versionversion=7.49.0 <=7.49.0
  6. Affected versionversion=7.49.1 <=7.49.1
  7. Affected versionversion=7.50.0 <=7.50.0
  8. Affected versionversion=7.50.1 <=7.50.1
  9. Affected versionversion=7.50.2 <=7.50.2
  10. Affected versionversion=7.50.3 <=7.50.3
  11. Affected versionversion=7.51.0 <=7.51.0
  12. Affected versionversion=7.52.0 <=7.52.0
  13. Affected versionversion=7.52.1 <=7.52.1
  14. Affected versionversion=7.53.0 <=7.53.0
  15. Affected versionversion=7.53.1 <=7.53.1
  16. Affected versionversion=7.54.0 <=7.54.0
  17. Affected versionversion=7.54.1 <=7.54.1
  18. Affected versionversion=7.55.0 <=7.55.0
  19. Affected versionversion=7.55.1 <=7.55.1
  20. Affected versionversion=7.56.0 <=7.56.0
  21. Affected versionversion=7.56.1 <=7.56.1
  22. Affected versionversion=7.57.0 <=7.57.0
  23. Affected versionversion=7.58.0 <=7.58.0
  24. Affected versionversion=7.59.0 <=7.59.0
  25. Affected versionversion=7.60.0 <=7.60.0
  26. Affected versionversion=7.61.0 <=7.61.0
  27. Affected versionversion=7.61.1 <=7.61.1
  28. Affected versionversion=7.62.0 <=7.62.0
  29. Affected versionversion=7.63.0 <=7.63.0
  30. Affected versionversion=7.64.0 <=7.64.0
  31. Affected versionversion=7.64.1 <=7.64.1
  32. Affected versionversion=7.65.0 <=7.65.0
  33. Affected versionversion=7.65.1 <=7.65.1
  34. Affected versionversion=7.65.2 <=7.65.2
  35. Affected versionversion=7.65.3 <=7.65.3
  36. Affected versionversion=7.66.0 <=7.66.0
  37. Affected versionversion=7.67.0 <=7.67.0
  38. Affected versionversion=7.68.0 <=7.68.0
  39. Affected versionversion=7.69.0 <=7.69.0
  40. Affected versionversion=7.69.1 <=7.69.1
  41. Affected versionversion=7.70.0 <=7.70.0
  42. Affected versionversion=7.71.0 <=7.71.0
  43. Affected versionversion=7.71.1 <=7.71.1
  44. Affected versionversion=7.72.0 <=7.72.0
  45. Affected versionversion=7.73.0 <=7.73.0
  46. Affected versionversion=7.74.0 <=7.74.0
  47. Affected versionversion=7.75.0 <=7.75.0
  48. Affected versionversion=7.76.0 <=7.76.0
  49. Affected versionversion=7.76.1 <=7.76.1
  50. Affected versionversion=7.77.0 <=7.77.0
  51. Affected versionversion=7.78.0 <=7.78.0
  52. Affected versionversion=7.79.0 <=7.79.0
  53. Affected versionversion=7.79.1 <=7.79.1
  54. Affected versionversion=7.80.0 <=7.80.0
  55. Affected versionversion=7.81.0 <=7.81.0
  56. Affected versionversion=7.82.0 <=7.82.0
  57. Affected versionversion=7.83.0 <=7.83.0
  58. Affected versionversion=7.83.1 <=7.83.1
  59. Affected versionversion=7.84.0 <=7.84.0
  60. Affected versionversion=7.85.0 <=7.85.0
  61. Affected versionversion=7.86.0 <=7.86.0
  62. Affected versionversion=7.87.0 <=7.87.0
  63. Affected versionversion=7.88.0 <=7.88.0
  64. Affected versionversion=7.88.1 <=7.88.1
  65. Affected versionversion=8.0.0 <=8.0.0
  66. Affected versionversion=8.0.1 <=8.0.1
  67. Affected versionversion=8.10.0 <=8.10.0
  68. Affected versionversion=8.10.1 <=8.10.1
  69. Affected versionversion=8.1.0 <=8.1.0
  70. Affected versionversion=8.11.0 <=8.11.0
  71. Affected versionversion=8.11.1 <=8.11.1
  72. Affected versionversion=8.1.1 <=8.1.1
  73. Affected versionversion=8.12.0 <=8.12.0
  74. Affected versionversion=8.12.1 <=8.12.1
  75. Affected versionversion=8.1.2 <=8.1.2
  76. Affected versionversion=8.13.0 <=8.13.0
  77. Affected versionversion=8.14.0 <=8.14.0
  78. Affected versionversion=8.14.1 <=8.14.1
  79. Affected versionversion=8.15.0 <=8.15.0
  80. Affected versionversion=8.16.0 <=8.16.0
  81. Affected versionversion=8.17.0 <=8.17.0
  82. Affected versionversion=8.18.0 <=8.18.0
  83. Affected versionversion=8.19.0 <=8.19.0
  84. Affected versionversion=8.20.0 <=8.20.0
  85. Affected versionversion=8.2.0 <=8.2.0
  86. Affected versionversion=8.2.1 <=8.2.1
  87. Affected versionversion=8.3.0 <=8.3.0
  88. Affected versionversion=8.4.0 <=8.4.0
  89. Affected versionversion=8.5.0 <=8.5.0
  90. Affected versionversion=8.6.0 <=8.6.0
  91. Affected versionversion=8.7.0 <=8.7.0
  92. Affected versionversion=8.7.1 <=8.7.1
  93. Affected versionversion=8.8.0 <=8.8.0
  94. Affected versionversion=8.9.0 <=8.9.0
  95. Affected versionversion=8.9.1 <=8.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=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=8.2.1 <=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

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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-201Information Exposure Through Sent Data

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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