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curl · disclosed report #3769293

Low priority HSTS bypass in curl_easy_duphandle()

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ReportAccessWhose objectBoundary crossed
curl cookie mixed case PSL bypassNo accountNo object involvedA server-set cookie bypassed the public-suffix boundary and was sent to unrelated origins.
CVE-2023-46218: cookie mixed case PSL bypassA user accountNo object involvedCookie scope protection was bypassed, allowing a cookie set by one site to be sent to other sites under the same public suffix.
CVE-2022-27779: cookie for trailing dot TLDA user accountNo object involvedA cookie set by one site was scoped broadly enough to be sent to an unrelated site.
CVE-2026-3783: token leak with redirect and netrcA user accountNo object involvedA bearer token intended for the original host is sent to a different redirect destination.
Google Maps API key leaked during device pairingA user accountNo object involvedA logged-in user could obtain an application API key through the device-pairing request.
CVE-2026-6429: netrc credential leak with reused proxy connectionA user accountNo object involvedCredentials for one host were sent as host Authorization to different redirected hosts.
Program
curl
Status
Informative
Severity
Low
Bounty
None stated
Weakness as filed
Information Exposure Through Sent Data
Disclosed
2026
Upvotes
5

Data as of 2026-11-15. CVE List through 2026-11-15 · EPSS of 2026-11-15 · CISA KEV checked 2026-11-15. Sources: the CVE List, CISA KEV, EPSS, NVD, nuclei templates and public bug bounty data.