CVE-2026-82209Public exploitNetwork attack vector

Cookie disclosure via public-suffix wildcard scope

Published Sep 6, 2026 · Updated Sep 8, 2026

Information disclosure in affected curl releases from 7.46.0 through 8.21.0 allows remote attackers to receive cookies via sibling-domain requests. Curl_cookie_add accepts a public-suffix Domain equal to the origin, and is_public_suffix leaves the cookie tail-matching instead of host-only. Exploitation requires libpsl support, a cookie issued by the public-suffix apex, and a later request or redirect to an attacker-controlled sibling; the result is cookie disclosure only.

CVSS severity3.7
Low
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

Information disclosure in affected curl releases from 7.46.0 through 8.21.0 allows remote attackers to receive cookies via sibling-domain requests. Curl_cookie_add accepts a public-suffix Domain equal to the origin, and is_public_suffix leaves the cookie tail-matching instead of host-only. Exploitation requires libpsl support, a cookie issued by the public-suffix apex, and a later request or redirect to an attacker-controlled sibling; the result is cookie disclosure only.

The record

CVE
CVE-2026-82209
Published
Sep 6, 2026
Updated
Sep 8, 2026
Vendor
curl
Product
curl
Classifications
CWE-201, T1539
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=7.46.0 <=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=8.21.0 <=8.21.0
  87. Affected versionversion=8.2.1 <=8.2.1
  88. Affected versionversion=8.3.0 <=8.3.0
  89. Affected versionversion=8.4.0 <=8.4.0
  90. Affected versionversion=8.5.0 <=8.5.0
  91. Affected versionversion=8.6.0 <=8.6.0
  92. Affected versionversion=8.7.0 <=8.7.0
  93. Affected versionversion=8.7.1 <=8.7.1
  94. Affected versionversion=8.8.0 <=8.8.0
  95. Affected versionversion=8.9.0 <=8.9.0
  96. 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=8.21.0 <=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

3.7Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/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 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
T1539Steal Web Session Cookie

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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