CVE-2026-87863 is listed by USN-8932-1: curl vulnerabilities.

Code

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No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Oct 14, 2026 · Ubuntu Security Notices

   Detected

   Stanislav Fort discovered that curl did not properly clear AWS SigV4 authentication state when CURLOPT_AWS_SIGV4 was set to NULL. An attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-86409) Stanislav Fort discovered that an HTTP proxy could trick libcurl into sending credentials to the proxy itself by r

Sources

• CVE.orgVulnerability recordCVE-2026-87863

  Official CVE identifier

  cve.org
• Ubuntu Security NoticesVendor advisoryCVE-2026-87863

  Stanislav Fort discovered that curl did not properly clear AWS SigV4 authentication state when CURLOPT_AWS_SIGV4 was set to NULL. An attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-8

  ubuntu.com