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CVE-2026-6253 is a proxy credential disclosure vulnerability affecting curl and libcurl versions 7.14.1 through 8.19.0 inclusive. When different proxies are configured for different URL schemes, following a redirect from a scheme using an authenticated proxy to a scheme using a different, unauthenticated proxy can cause curl to forward the first proxy's credentials to the second proxy. The leaked credentials are transmitted in base64-encoded form. The vulnerability affects both the curl command-line tool and libcurl and is fixed in version 8.20.0.
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No public exploit code observed for this vulnerability.
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24 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A proxy credential disclosure vulnerability in curl. When different URL schemes use different proxies, curl may forward credentials from an authenticated proxy to a second proxy that requires no credentials after following a cross-scheme redirect. The reference rates the vulnerability Medium, reports available exploits, and identifies a patched package version.
A vulnerability covered by an AlmaLinux 9.2 local-security-check notice. The notice states exploits are available and provides a patch publication date, but does not describe the flaw's technical nature.
A vulnerability referenced by an AlmaLinux 9.6 local security-check advisory. No technical vulnerability details are provided.
A vulnerability in curl/libcurl addressed by the Huawei EulerOS SA-2026-3408 security advisory; no technical flaw type is provided.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.