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CVE-2026-8927

critical CVSS 9.1 EPSS 0.5%

When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against `proxyA` using Digest auth, a subsequent transfer routed through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended solely for `proxyA`.

Versions it affects

Software versions checked with the free lookup that CVE-2026-8927 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
9.1 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.5% probability of exploitation in the next 30 days, higher than 41% of scored vulnerabilities
Weakness
CWE-294
Published
2026-07-03
NVD CVE.org

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