This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page. View CVE-2026-11856 →

DEBIAN-CVE-2026-11856

Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with Digest authentication and then changing the origin to a diffe...

Original description

The description as published by the source.

Successfully using libcurl to do a transfer to a specific HTTP origin (hostA) with Digest authentication and then changing the origin to a different one (hostB) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the Authorization: header field meant for hostA, to hostB.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Affected packages

Debian:12 curl

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:13 curl

[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]

Debian:14 curl

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8.21.0~rc3-1"}]}]

References

advisory security-tracker.debian.org