CVE•Published 2026-07-17•Modified 2026-07-29•0 articles on news•4 live references•NVD data

CVE-2026-54171Excon_project · Excon

Vulnerability data via NVD (ingested)

CVSS v3.1

6.5

MEDIUM

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

EPSS percentile

Exploit Prediction Scoring System · top 76% of all CVEs

Weaknesses (CWE)

CWE-201Insertion of Sensitive Information Into Sent Data

Description

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.

Timeline

Published 2026-07-17

Modified 2026-07-29

External references

NVD MITRE Exploit-DB VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-54171

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Excon Project Excon"

All exposed Excon Project Excon instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Excon"

HTTP body or banner mentions "Excon" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-54171