https://seclists.org/oss-sec/2026/q2/269: [ADVISORY] curl: CVE-2026-6253: proxy cdentials leak over dict-to proxy
Published Apr 29, 2026
·Updated
Affected Software
2 affected components
curl curl>=7.14.1<=8.19.0
curl libcurl>=7.14.1<=8.19.0
Frequently Asked Questions
1
What is the severity of CVE-2026-6253?
CVE-2026-6253 is classified as a medium severity vulnerability.
2
How do I fix CVE-2026-6253?
To fix CVE-2026-6253, update curl to the latest version where the vulnerability has been patched.
3
What types of credentials are impacted by CVE-2026-6253?
CVE-2026-6253 affects proxy credentials that may be erroneously leaked from one proxy to another.
4
Which versions of curl are affected by CVE-2026-6253?
CVE-2026-6253 affects all versions of curl prior to the fix released after April 29, 2026.
5
Is CVE-2026-6253 related to the usage of redirect proxies?
Yes, CVE-2026-6253 specifically involves the leaking of credentials over redirect-to proxy mechanisms.