Cleartext Transmission of Sensitive Information Affecting curl package, versions <8.18.0-1ubuntu2.1


Severity

Recommended
low

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.02% (5th percentile)

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  • Snyk IDSNYK-UBUNTU2604-CURL-16335357
  • published4 May 2026
  • disclosed13 May 2026

Introduced: 4 May 2026

NewCVE-2026-6276  (opens in a new tab)
CWE-319  (opens in a new tab)

How to fix?

Upgrade Ubuntu:26.04 curl to version 8.18.0-1ubuntu2.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Ubuntu. See How to fix? for Ubuntu:26.04 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1