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CVE-2026-8458

medium CVSS 6.5 EPSS 0.4%

libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different "services". libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different services.

Versions it affects

Software versions checked with the free lookup that CVE-2026-8458 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
Medium
CVSS base score
6.5 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.4% probability of exploitation in the next 30 days, higher than 29% of scored vulnerabilities
Weakness
CWE-488
Published
2026-07-03
NVD CVE.org

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