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Fencer Vulns
medium 6.5

CVE-2026-54171 json

Excon: redact additional sensitive/risky headers when following redirects

published 2026-07-10 4 mo ago modified 2026-09-10 1 mo ago also EUVD-2026-45312 , GHSA-48rx-c7pg-q66r

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

Excon is usable, fast, simple HTTP 1.1 for Ruby. Prior to 1.5.0, Excon's RedirectFollower middleware failed to strip additional sensitive headers when following redirects and did not provide a custom list of headers to strip. This could cause inadvertent leakage of sensitive data when the initial request includes header information that is not intended for the new target. This issue is fixed in version 1.5.0.

Patch / fix

  • rubygems excon 1.5.0
  • excon_project excon 1.5.0
  • ruby-excon Debian 14 1.5.0-1

debian advisories DEBIAN-CVE-2026-54171

  • rubygem-excon Azure Linux 3.0 0.102.0-2

azure linux advisories AZL-92460

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-54171 updated cvss 6.5

excon: Excon: Information disclosure via unstripped sensitive headers during redirects

  • Red Hat 3scale API Management Platform 2 3scale-amp2/zync-rhel9 Red Hat Satellite 6 rubygem-excon
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
rubygems excon
<1.5.0
1.5.0

Affected products

  • excon excon

Classification

Weakness
  • CWE-201 Insertion of Sensitive Information Into Sent Data
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-522 Insufficiently Protected Credentials

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.