All vulnerabilities

Servers and applications

CVE-2026-6276

Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request is subsequently done using the same *easy handle* but without the custom `Host:` header set, the second request would use stale information and pass on cookies meant for the first host in the second request. Leak them.

Severity
High 7.5
Published
13 May 2026
Last changed
15 Sept 2026
Added to UpHeron
21 Oct 2026
Fixed in
8.20.0
Sources
NVD

Affected software

SoftwareAffected versions
curlServers and applications · cpe:a:haxx:curl
  • From 7.71.0 before 8.20.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-6276
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-6276