CVE-2026-6253

Name
CVE-2026-6253
Description
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
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
Patch https://curl.se/docs/CVE-2026-6253.html
Vendor Advisory https://curl.se/docs/CVE-2026-6253.json
Exploit https://hackerone.com/reports/3669637
Mailing List http://www.openwall.com/lists/oss-security/2026/04/29/11

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* curl >= 7.14.1 < 8.20.0

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
curl edge-main 8.20.0-r0 Achill Gilgenast <achill@achill.org> fixed
curl edge-main 8.19.0-r0 Achill Gilgenast <achill@achill.org> possibly vulnerable
curl edge-main 8.18.0-r0 Achill Gilgenast <achill@achill.org> possibly vulnerable
curl edge-main 8.17.0-r1 Achill Gilgenast <achill@achill.org> possibly vulnerable
curl edge-main 8.17.0-r0 Achill Gilgenast <achill@achill.org> possibly vulnerable
curl edge-main 8.16.0-r2 Achill Gilgenast <achill@achill.org> possibly vulnerable
curl edge-main 8.16.0-r1 Achill Gilgenast <achill@achill.org> possibly vulnerable
curl edge-main 8.16.0-r0 Achill Gilgenast <achill@achill.org> possibly vulnerable
curl edge-main 8.15.0-r2 Achill Gilgenast <achill@achill.org> possibly vulnerable
curl edge-main 8.15.0-r1 Achill Gilgenast <achill@achill.org> possibly vulnerable
curl edge-main 8.15.0-r0 fossdd <fossdd@pwned.life> possibly vulnerable
curl edge-main 8.14.1-r2 fossdd <fossdd@pwned.life> possibly vulnerable
curl edge-main 8.14.1-r1 fossdd <fossdd@pwned.life> possibly vulnerable
curl edge-main 8.14.1-r0 fossdd <fossdd@pwned.life> possibly vulnerable
curl edge-main 8.14.0-r2 fossdd <fossdd@pwned.life> possibly vulnerable
curl edge-main 8.14.0-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.14.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.13.0-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.13.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.12.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.12.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.12.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.11.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.11.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.11.0-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.11.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.10.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.9.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.9.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.7.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.6.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.5.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.4.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.3.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.1.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 8.0.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 7.88.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 7.87.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 7.86.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 7.85.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 7.84.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 7.83.1-r0 None possibly vulnerable
curl edge-main 7.83.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 7.79.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 7.78.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 7.77.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl edge-main 7.76.0-r0 None possibly vulnerable
curl edge-main 7.74.0-r0 None possibly vulnerable
curl edge-main 7.72.0-r0 None possibly vulnerable
curl edge-main 7.71.0-r0 None possibly vulnerable
curl edge-main 7.66.0-r0 None possibly vulnerable
curl edge-main 7.65.0-r0 None possibly vulnerable
curl edge-main 7.64.0-r0 None possibly vulnerable
curl edge-main 7.62.0-r0 None possibly vulnerable
curl edge-main 7.61.1-r0 None possibly vulnerable
curl edge-main 7.61.0-r0 None possibly vulnerable
curl edge-main 7.60.0-r0 None possibly vulnerable
curl edge-main 7.59.0-r0 None possibly vulnerable
curl edge-main 7.57.0-r0 None possibly vulnerable
curl edge-main 7.56.1-r0 None possibly vulnerable
curl edge-main 7.55.0-r0 None possibly vulnerable
curl edge-main 7.54.0-r0 None possibly vulnerable
curl edge-main 7.53.1-r2 None possibly vulnerable
curl edge-main 7.53.0-r0 None possibly vulnerable
curl edge-main 7.52.1-r0 None possibly vulnerable
curl edge-main 7.51.0-r0 None possibly vulnerable
curl edge-main 7.50.3-r0 None possibly vulnerable
curl edge-main 7.50.2-r0 None possibly vulnerable
curl edge-main 7.50.1-r0 None possibly vulnerable
curl edge-main 7.36.0-r0 None possibly vulnerable
curl 3.23-main 8.19.0-r0 Achill Gilgenast <achill@achill.org> possibly vulnerable
curl 3.23-main 8.17.0-r1 Achill Gilgenast <achill@achill.org> possibly vulnerable
curl 3.22-main 8.14.1-r2 fossdd <fossdd@pwned.life> possibly vulnerable
curl 3.22-main 8.14.1-r1 fossdd <fossdd@pwned.life> possibly vulnerable
curl 3.22-main 8.14.1-r0 None possibly vulnerable
curl 3.22-main 8.14.0-r0 None possibly vulnerable
curl 3.22-main 8.12.0-r0 None possibly vulnerable
curl 3.22-main 8.11.1-r0 None possibly vulnerable
curl 3.22-main 8.11.0-r0 None possibly vulnerable
curl 3.22-main 8.10.0-r0 None possibly vulnerable
curl 3.22-main 8.9.1-r0 None possibly vulnerable
curl 3.22-main 8.9.0-r0 None possibly vulnerable
curl 3.22-main 8.7.1-r0 None possibly vulnerable
curl 3.22-main 8.6.0-r0 None possibly vulnerable
curl 3.22-main 8.5.0-r0 None possibly vulnerable
curl 3.22-main 8.4.0-r0 None possibly vulnerable
curl 3.22-main 8.3.0-r0 None possibly vulnerable
curl 3.22-main 8.1.0-r0 None possibly vulnerable
curl 3.22-main 8.0.0-r0 None possibly vulnerable
curl 3.22-main 7.88.0-r0 None possibly vulnerable
curl 3.22-main 7.87.0-r0 None possibly vulnerable
curl 3.22-main 7.86.0-r0 None possibly vulnerable
curl 3.22-main 7.85.0-r0 None possibly vulnerable
curl 3.22-main 7.84.0-r0 None possibly vulnerable
curl 3.22-main 7.83.1-r0 None possibly vulnerable
curl 3.22-main 7.83.0-r0 None possibly vulnerable
curl 3.22-main 7.79.0-r0 None possibly vulnerable
curl 3.22-main 7.78.0-r0 None possibly vulnerable
curl 3.22-main 7.77.0-r0 None possibly vulnerable
curl 3.22-main 7.76.0-r0 None possibly vulnerable
curl 3.22-main 7.74.0-r0 None possibly vulnerable
curl 3.22-main 7.72.0-r0 None possibly vulnerable
curl 3.22-main 7.71.0-r0 None possibly vulnerable
curl 3.22-main 7.66.0-r0 None possibly vulnerable
curl 3.22-main 7.65.0-r0 None possibly vulnerable
curl 3.22-main 7.64.0-r0 None possibly vulnerable
curl 3.22-main 7.62.0-r0 None possibly vulnerable
curl 3.22-main 7.61.1-r0 None possibly vulnerable
curl 3.22-main 7.61.0-r0 None possibly vulnerable
curl 3.22-main 7.60.0-r0 None possibly vulnerable
curl 3.22-main 7.59.0-r0 None possibly vulnerable
curl 3.22-main 7.57.0-r0 None possibly vulnerable
curl 3.22-main 7.56.1-r0 None possibly vulnerable
curl 3.22-main 7.55.0-r0 None possibly vulnerable
curl 3.22-main 7.54.0-r0 None possibly vulnerable
curl 3.22-main 7.53.1-r2 None possibly vulnerable
curl 3.22-main 7.53.0-r0 None possibly vulnerable
curl 3.22-main 7.52.1-r0 None possibly vulnerable
curl 3.22-main 7.51.0-r0 None possibly vulnerable
curl 3.22-main 7.50.3-r0 None possibly vulnerable
curl 3.22-main 7.50.2-r0 None possibly vulnerable
curl 3.22-main 7.50.1-r0 None possibly vulnerable
curl 3.22-main 7.36.0-r0 None possibly vulnerable
curl 3.21-main 8.14.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.21-main 8.14.1-r0 None possibly vulnerable
curl 3.21-main 8.14.0-r0 None possibly vulnerable
curl 3.21-main 8.12.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.21-main 8.12.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.21-main 8.12.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.21-main 8.11.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.21-main 8.11.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.21-main 8.11.0-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.21-main 8.11.0-r0 None possibly vulnerable
curl 3.21-main 8.10.0-r0 None possibly vulnerable
curl 3.21-main 8.9.1-r0 None possibly vulnerable
curl 3.21-main 8.9.0-r0 None possibly vulnerable
curl 3.21-main 8.7.1-r0 None possibly vulnerable
curl 3.21-main 8.6.0-r0 None possibly vulnerable
curl 3.21-main 8.5.0-r0 None possibly vulnerable
curl 3.21-main 8.4.0-r0 None possibly vulnerable
curl 3.21-main 8.3.0-r0 None possibly vulnerable
curl 3.21-main 8.1.0-r0 None possibly vulnerable
curl 3.21-main 8.0.0-r0 None possibly vulnerable
curl 3.21-main 7.88.0-r0 None possibly vulnerable
curl 3.21-main 7.87.0-r0 None possibly vulnerable
curl 3.21-main 7.86.0-r0 None possibly vulnerable
curl 3.21-main 7.85.0-r0 None possibly vulnerable
curl 3.21-main 7.84.0-r0 None possibly vulnerable
curl 3.21-main 7.83.1-r0 None possibly vulnerable
curl 3.21-main 7.83.0-r0 None possibly vulnerable
curl 3.21-main 7.79.0-r0 None possibly vulnerable
curl 3.21-main 7.78.0-r0 None possibly vulnerable
curl 3.21-main 7.77.0-r0 None possibly vulnerable
curl 3.21-main 7.76.0-r0 None possibly vulnerable
curl 3.21-main 7.74.0-r0 None possibly vulnerable
curl 3.21-main 7.72.0-r0 None possibly vulnerable
curl 3.21-main 7.71.0-r0 None possibly vulnerable
curl 3.21-main 7.66.0-r0 None possibly vulnerable
curl 3.21-main 7.65.0-r0 None possibly vulnerable
curl 3.21-main 7.64.0-r0 None possibly vulnerable
curl 3.21-main 7.62.0-r0 None possibly vulnerable
curl 3.21-main 7.61.1-r0 None possibly vulnerable
curl 3.21-main 7.61.0-r0 None possibly vulnerable
curl 3.21-main 7.60.0-r0 None possibly vulnerable
curl 3.21-main 7.59.0-r0 None possibly vulnerable
curl 3.21-main 7.57.0-r0 None possibly vulnerable
curl 3.21-main 7.56.1-r0 None possibly vulnerable
curl 3.21-main 7.55.0-r0 None possibly vulnerable
curl 3.21-main 7.54.0-r0 None possibly vulnerable
curl 3.21-main 7.53.1-r2 None possibly vulnerable
curl 3.21-main 7.53.0-r0 None possibly vulnerable
curl 3.21-main 7.52.1-r0 None possibly vulnerable
curl 3.21-main 7.51.0-r0 None possibly vulnerable
curl 3.21-main 7.50.3-r0 None possibly vulnerable
curl 3.21-main 7.50.2-r0 None possibly vulnerable
curl 3.21-main 7.50.1-r0 None possibly vulnerable
curl 3.21-main 7.36.0-r0 None possibly vulnerable
curl 3.20-main 8.14.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.20-main 8.14.1-r0 None possibly vulnerable
curl 3.20-main 8.14.0-r0 None possibly vulnerable
curl 3.20-main 8.12.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.20-main 8.12.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.20-main 8.11.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.20-main 8.11.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.20-main 8.11.0-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.20-main 8.11.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.20-main 8.10.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.20-main 8.9.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.20-main 8.9.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.20-main 8.7.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.20-main 8.6.0-r0 None possibly vulnerable
curl 3.20-main 8.5.0-r0 None possibly vulnerable
curl 3.20-main 8.4.0-r0 None possibly vulnerable
curl 3.20-main 8.3.0-r0 None possibly vulnerable
curl 3.20-main 8.1.0-r0 None possibly vulnerable
curl 3.20-main 8.0.0-r0 None possibly vulnerable
curl 3.20-main 7.88.0-r0 None possibly vulnerable
curl 3.20-main 7.87.0-r0 None possibly vulnerable
curl 3.20-main 7.86.0-r0 None possibly vulnerable
curl 3.20-main 7.85.0-r0 None possibly vulnerable
curl 3.20-main 7.84.0-r0 None possibly vulnerable
curl 3.20-main 7.83.1-r0 None possibly vulnerable
curl 3.20-main 7.83.0-r0 None possibly vulnerable
curl 3.20-main 7.79.0-r0 None possibly vulnerable
curl 3.20-main 7.78.0-r0 None possibly vulnerable
curl 3.20-main 7.77.0-r0 None possibly vulnerable
curl 3.20-main 7.76.0-r0 None possibly vulnerable
curl 3.20-main 7.74.0-r0 None possibly vulnerable
curl 3.20-main 7.72.0-r0 None possibly vulnerable
curl 3.20-main 7.71.0-r0 None possibly vulnerable
curl 3.20-main 7.66.0-r0 None possibly vulnerable
curl 3.20-main 7.65.0-r0 None possibly vulnerable
curl 3.20-main 7.64.0-r0 None possibly vulnerable
curl 3.20-main 7.62.0-r0 None possibly vulnerable
curl 3.20-main 7.61.1-r0 None possibly vulnerable
curl 3.20-main 7.61.0-r0 None possibly vulnerable
curl 3.20-main 7.60.0-r0 None possibly vulnerable
curl 3.20-main 7.59.0-r0 None possibly vulnerable
curl 3.20-main 7.57.0-r0 None possibly vulnerable
curl 3.20-main 7.56.1-r0 None possibly vulnerable
curl 3.20-main 7.55.0-r0 None possibly vulnerable
curl 3.20-main 7.54.0-r0 None possibly vulnerable
curl 3.20-main 7.53.1-r2 None possibly vulnerable
curl 3.20-main 7.53.0-r0 None possibly vulnerable
curl 3.20-main 7.52.1-r0 None possibly vulnerable
curl 3.20-main 7.51.0-r0 None possibly vulnerable
curl 3.20-main 7.50.3-r0 None possibly vulnerable
curl 3.20-main 7.50.2-r0 None possibly vulnerable
curl 3.20-main 7.50.1-r0 None possibly vulnerable
curl 3.20-main 7.36.0-r0 None possibly vulnerable
curl 3.19-main 8.14.1-r2 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.19-main 8.14.1-r0 None possibly vulnerable
curl 3.19-main 8.14.0-r0 None possibly vulnerable
curl 3.19-main 8.12.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.19-main 8.12.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.19-main 8.11.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.19-main 8.11.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.19-main 8.11.0-r0 None possibly vulnerable
curl 3.19-main 8.10.0-r0 None possibly vulnerable
curl 3.19-main 8.9.1-r1 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.19-main 8.9.1-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.19-main 8.9.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.19-main 8.7.1-r0 None possibly vulnerable
curl 3.19-main 8.6.0-r0 None possibly vulnerable
curl 3.19-main 8.5.0-r0 Natanael Copa <ncopa@alpinelinux.org> possibly vulnerable
curl 3.19-main 8.4.0-r0 None possibly vulnerable
curl 3.19-main 8.3.0-r0 None possibly vulnerable
curl 3.19-main 8.1.0-r0 None possibly vulnerable
curl 3.19-main 8.0.0-r0 None possibly vulnerable
curl 3.19-main 7.88.0-r0 None possibly vulnerable
curl 3.19-main 7.87.0-r0 None possibly vulnerable
curl 3.19-main 7.86.0-r0 None possibly vulnerable
curl 3.19-main 7.85.0-r0 None possibly vulnerable
curl 3.19-main 7.84.0-r0 None possibly vulnerable
curl 3.19-main 7.83.1-r0 None possibly vulnerable
curl 3.19-main 7.83.0-r0 None possibly vulnerable
curl 3.19-main 7.79.0-r0 None possibly vulnerable
curl 3.19-main 7.78.0-r0 None possibly vulnerable
curl 3.19-main 7.77.0-r0 None possibly vulnerable
curl 3.19-main 7.76.0-r0 None possibly vulnerable
curl 3.19-main 7.74.0-r0 None possibly vulnerable
curl 3.19-main 7.72.0-r0 None possibly vulnerable
curl 3.19-main 7.71.0-r0 None possibly vulnerable
curl 3.19-main 7.66.0-r0 None possibly vulnerable
curl 3.19-main 7.65.0-r0 None possibly vulnerable
curl 3.19-main 7.64.0-r0 None possibly vulnerable
curl 3.19-main 7.62.0-r0 None possibly vulnerable
curl 3.19-main 7.61.1-r0 None possibly vulnerable
curl 3.19-main 7.61.0-r0 None possibly vulnerable
curl 3.19-main 7.60.0-r0 None possibly vulnerable
curl 3.19-main 7.59.0-r0 None possibly vulnerable
curl 3.19-main 7.57.0-r0 None possibly vulnerable
curl 3.19-main 7.56.1-r0 None possibly vulnerable
curl 3.19-main 7.55.0-r0 None possibly vulnerable
curl 3.19-main 7.54.0-r0 None possibly vulnerable
curl 3.19-main 7.53.1-r2 None possibly vulnerable
curl 3.19-main 7.53.0-r0 None possibly vulnerable
curl 3.19-main 7.52.1-r0 None possibly vulnerable
curl 3.19-main 7.51.0-r0 None possibly vulnerable
curl 3.19-main 7.50.3-r0 None possibly vulnerable
curl 3.19-main 7.50.2-r0 None possibly vulnerable
curl 3.19-main 7.50.1-r0 None possibly vulnerable
curl 3.19-main 7.36.0-r0 None possibly vulnerable