SB2026050536 - Insertion of Sensitive Information Into Sent Data in Traefik

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Main Vulnerability Database SB2026050536

SB2026050536 - Insertion of Sensitive Information Into Sent Data in Traefik

Published: May 5, 2026

Security Bulletin ID SB2026050536
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Insertion of Sensitive Information Into Sent Data (CVE-ID: CVE-2026-41181)

CWE-ID: CWE-201 - Insertion of Sensitive Information Into Sent Data

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to insertion of sensitive information into sent data in the errors middleware when forwarding requests to a separate error page service after a backend response matches the configured status range. A remote attacker can send a request containing sensitive headers to disclose sensitive information.

Only deployments that use the errors middleware with a distinct error page service are affected.


Remediation

Install update from vendor's website.

References