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CVE-2026-19931

critical CVSS 9.8 EPSS 0.7%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-19931 applies to, and the release that fixes it where the sources name one.

curl 8.1.2 fixed in 8.14.2

At a glance

Severity
Critical
CVSS base score
9.8 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.7% probability of exploitation in the next 30 days, higher than 54% of scored vulnerabilities
Weakness
CWE-488
Published
2026-09-06
NVD CVE.org

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