CVE-2019-11027: Ruby OpenID (aka ruby-openid) through 2.8.0 has a remotely exploitable flaw

Q: How do I fix CVE-2019-11027?

ruby-openid: upgrade to newer than 2.8.0. Exact commands for each OS are on this page.

Q: Is CVE-2019-11027 being exploited?

CVE-2019-11027 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-2019-11027 affect?

CVE-2019-11027 affects ruby-openid. Severity is critical (CVSS 9.8). Ruby OpenID (aka ruby-openid) through 2.8.0 has a remotely exploitable flaw. This library is used by Rails web applications to integrate with OpenID Providers. Severity can range from medium to critical, depending on how a web application d

Q: How urgent is CVE-2019-11027?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2019-11027 is a critical-severity flaw (CVSS 9.8) affecting ruby-openid. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Ruby OpenID (aka ruby-openid) through 2.8.0 has a remotely exploitable flaw. This library is used by Rails web applications to integrate with OpenID Providers. Severity can range from medium to critical, depending on how a web application developer chose to employ the ruby-openid library. Developers who based their OpenID integration heavily on the "example app" provided by the project are at highest risk.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	3.0% (top 13%)
CISA exploited list	No
Published	2019-06-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: openid

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

Am I affected?

Timeline

2019-06-10 19:29 UTCPublished CVE record published
2026-06-17 02:12 UTCUpdated Record last modified

openid ruby-openid UPGRADE

Affected: <= 2.8.0

Fixed in: newer than 2.8.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 2.8.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ruby-openid

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-2019-11027?

ruby-openid: upgrade to newer than 2.8.0. Exact commands for each OS are on this page.

Is CVE-2019-11027 being exploited?

CVE-2019-11027 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-2019-11027 affect?

CVE-2019-11027 affects ruby-openid. Severity is critical (CVSS 9.8). Ruby OpenID (aka ruby-openid) through 2.8.0 has a remotely exploitable flaw. This library is used by Rails web applications to integrate with OpenID Providers. Severity can range from medium to critical, depending on how a web application d

How urgent is CVE-2019-11027?

Priority 61/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Ruby on Rails vulnerabilities · Ruby vulnerabilities

References

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