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CVE-2026-6253

medium CVSS 5.9 EPSS 0.8%

curl might erroneously pass on credentials for a first proxy to a second proxy. This can happen when the following conditions are true: 1. curl is setup to use specific different proxies for different URL schemes 2. the first proxy needs credentials 3. the second proxy uses no credentials 4. while using the first proxy (using say `http://`), curl is asked to follow a redirect to a URL using another scheme (say `https://`), accessed using a second, different, proxy

Versions it affects

Software versions checked with the free lookup that CVE-2026-6253 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
5.9 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.8% probability of exploitation in the next 30 days, higher than 54% of scored vulnerabilities
Weakness
CWE-522
Published
2026-05-13
NVD CVE.org

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