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CVE-2026-11856

critical CVSS 9.8 EPSS 0.7%

Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest** authentication and then changing the origin to a different one (`hostB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Authorization:` header field meant for `hostA`, to `hostB`.

Versions it affects

Software versions checked with the free lookup that CVE-2026-11856 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 51% of scored vulnerabilities
Weakness
CWE-294
Published
2026-07-03
NVD CVE.org

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