CVE-2026-54171: Excon is usable, fast, simple HTTP 1.1 for Ruby

Q: How do I fix CVE-2026-54171?

excon: upgrade to 1.5.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-54171 being exploited?

CVE-2026-54171 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-54171 affect?

CVE-2026-54171 affects excon. Severity is medium (CVSS 6.5). 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 cau

Q: How urgent is CVE-2026-54171?

Priority 32/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2026-54171 is a medium-severity flaw (CVSS 6.5) affecting excon. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-201
Published	2026-07-17
Last modified	2026-07-29

Publisher (CNA): GitHub, Inc. · Vendor: excon project

Last updated 2026-07-29 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-17 20:17 UTCPublished CVE record published
2026-07-29 15:20 UTCUpdated Record last modified

excon project excon UPGRADE

Affected: < 1.5.0

Fixed in: 1.5.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy excon || rpm -q excon || excon --version

2. UPGRADE to 1.5.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade excon

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade excon

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-54171?

excon: upgrade to 1.5.0. Exact commands for each OS are on this page.

Is CVE-2026-54171 being exploited?

CVE-2026-54171 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-54171 affect?

CVE-2026-54171 affects excon. Severity is medium (CVSS 6.5). 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 cau

How urgent is CVE-2026-54171?

Priority 32/100. No elevated risk signals yet.

Software pages

Ruby vulnerabilities

References

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