CVE-2026-19931 The advisory has been revoked - it doesn't affect any version of package curl (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU2604-CURL-19499142
- published11 Sept 2026
- disclosed6 Sept 2026
Introduced: 6 Sep 2026
CVE-2026-19931 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:26.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Ubuntu.
A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication, when the initial request is done using empty credentials. This can make user B's request get sent over user A's previously authenticated connection.