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CVE-2026-54171 — Vulnerability in excon — CVE Details

MEDIUM

Excon does not redact additional sensitive/risky headers when following redirects

Published July 10, 2026Updated September 10, 2026Source: osv

Summary

### Impact The redirect follower middleware previously failed to strip a number of headers that are known to be sensitive and did not provide a way to provide a custom list of headers to strip. _What kind of vulnerability is it? Who is impacted?_ This could cause inadvertent leakage of sensitive data for users of the RedirectFollower middleware in cases where the initial request includes header information that is not intended for the new target. ### Patches Patch exists and is released in v1.5.0 ### Workarounds Users can backport the [fix](https://github.com/excon/excon/commit/ea89a35308a12f4b791b6c50f2cbd33f94889fa3) to a custom redirect follower middleware.

Advisory Timeline

  • First published July 10, 2026 (94 days ago).
  • Last revised September 10, 2026 — 61 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update excon to 1.5.0 or later
gem install excon -v 1.5.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
excon
rubygems
0.0.1, 0.0.10, 0.0.11, 0.0.12 (+274 more)1.5.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 6.5 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References

Frequently Asked Questions

What is CVE-2026-54171?
Excon does not redact additional sensitive/risky headers when following redirects This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 6.5/10).
How do I check if my project is affected by CVE-2026-54171?
CVE-2026-54171 affects excon. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-54171 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
6.5

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-48rx-c7pg-q66r

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