Improper Certificate Validation Affecting curl package, versions *


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

EPSS
0.33% (25th percentile)

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  • Snyk IDSNYK-DEBIAN12-CURL-16334174
  • published1 May 2026
  • disclosed13 May 2026

Introduced: 1 May 2026

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

How to fix?

There is no fixed version for Debian:12 curl.

NVD Description

Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Debian. See How to fix? for Debian:12 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