Improper Certificate Validation Affecting curl package, versions <8.18.0-1ubuntu2.1


Severity

Recommended
low

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.01% (3rd percentile)

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  • Snyk IDSNYK-UBUNTU2604-CURL-16335652
  • published4 May 2026
  • disclosed13 May 2026

Introduced: 4 May 2026

NewCVE-2026-4873  (opens in a new tab)
CWE-295  (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.

A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request to that same host bypasses the TLS requirement and instead transmit data unencrypted.

CVSS Base Scores

version 3.1