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CVE-2026-6276

high CVSS 7.5 EPSS 0.3%

Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request is subsequently done using the same *easy handle* but without the custom `Host:` header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.

Versions it affects

Software versions checked with the free lookup that CVE-2026-6276 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
High
CVSS base score
7.5 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.3% probability of exploitation in the next 30 days, higher than 27% of scored vulnerabilities
Weakness
CWE-319
Published
2026-05-13
NVD CVE.org

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