Excon: redact additional sensitive/risky headers when following redirects
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-201.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| excon | excon | before 1.5.0 | 1.5.0 | Patch available | CNA |
| — | excon (RubyGems) | before 1.5.0 | 1.5.0 | Patch available | GHSA-48rx-c7pg-q66r |
- excon Vendorexcon Affected before 1.5.0 Fixed in 1.5.0 Patch available CNA
- excon (RubyGems) Vendor— Affected before 1.5.0 Fixed in 1.5.0 Patch available GHSA-48rx-c7pg-q66r
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:excon_project:excon:*:*:*:*:*:ruby:*:* | before 1.5.0 | Vulnerable | Excon Project |
- cpe:2.3:a:excon_project:excon:*:*:*:*:*:ruby:*:* Versions before 1.5.0 Vulnerable ·Excon Project
Remediation
- Fix · CNA excon (excon) Fixed in 1.5.0
- Fix · GHSA-48rx-c7pg-q66r excon (RubyGems) Fixed in 1.5.0 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat 3scale API Management Platform 2 | Affected | No fix yet: Fix deferred |
| Red Hat Satellite 6 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-54171
- 2026-10-03 Alias added: GHSA-48rx-c7pg-q66r
References
Patch 3
More Excon Project Excon vulnerabilities
- TI-2019-12559 In RubyGem excon, interrupted Persistent Connections May Leak Response Data CVSS 3.1MEDIUM 5.9
Sources
- CVE-2026-54171 · CVE Program
- CVE-2026-54171 · NVD
- FIRST EPSS
- GHSA-48rx-c7pg-q66r · GitHub Advisory Database · CC BY 4.0
- CVE-2026-54171 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences