CVE-2016-11086: lib/oauth/consumer.rb in the oauth-ruby gem through 0.5.4 for Ruby does not verify server X.509 certificates i

Q: How do I fix CVE-2016-11086?

oauth-ruby: upgrade to newer than 0.5.4. Exact commands for each OS are on this page.

Q: Is CVE-2016-11086 being exploited?

CVE-2016-11086 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-2016-11086 affect?

CVE-2016-11086 affects oauth-ruby. Severity is high (CVSS 7.4). lib/oauth/consumer.rb in the oauth-ruby gem through 0.5.4 for Ruby does not verify server X.509 certificates if a certificate bundle cannot be found, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information

Q: How urgent is CVE-2016-11086?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.4REMOTEUPGRADE

CVE-2016-11086 is a high-severity flaw (CVSS 7.4) affecting oauth-ruby. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

lib/oauth/consumer.rb in the oauth-ruby gem through 0.5.4 for Ruby does not verify server X.509 certificates if a certificate bundle cannot be found, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.4 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 41%)
CISA exploited list	No
Weakness	CWE-295
Published	2020-09-24
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: oauth-ruby project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-09-24 20:15 UTCPublished CVE record published
2026-06-17 00:40 UTCUpdated Record last modified

oauth-ruby project oauth-ruby UPGRADE

Affected: <= 0.5.4

Fixed in: newer than 0.5.4

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy oauth-ruby || rpm -q oauth-ruby || oauth-ruby --version

2. UPGRADE to newer than 0.5.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade oauth-ruby

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade oauth-ruby

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-2016-11086?

oauth-ruby: upgrade to newer than 0.5.4. Exact commands for each OS are on this page.

Is CVE-2016-11086 being exploited?

CVE-2016-11086 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-2016-11086 affect?

CVE-2016-11086 affects oauth-ruby. Severity is high (CVSS 7.4). lib/oauth/consumer.rb in the oauth-ruby gem through 0.5.4 for Ruby does not verify server X.509 certificates if a certificate bundle cannot be found, which allows man-in-the-middle attackers to spoof servers and obtain sensitive information

How urgent is CVE-2016-11086?

Priority 51/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Ruby vulnerabilities

References

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