CVE-2025-27221: In the URI gem before 1.0.3 for Ruby, the URI handling methods (URI.join, URI#merge, URI#+) have an inadverten

Routine

LOW 3.2UPGRADE

CVE-2025-27221 is a low-severity flaw (CVSS 3.2) affecting uri. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the URI gem before 1.0.3 for Ruby, the URI handling methods (URI.join, URI#merge, URI#+) have an inadvertent leakage of authentication credentials because userinfo is retained even after changing the host.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.2 (Low)
Attack vector	Local
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-212
Published	2025-03-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ruby-lang

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

Am I affected?

Timeline

2025-03-04 00:15 UTCPublished CVE record published
2026-06-17 09:03 UTCUpdated Record last modified

ruby-lang uri UPGRADE

Affected: < 0.11.3 · >= 0.12.0 and < 0.12.4 · >= 0.13.0 and < 0.13.2 · >= 1.0.0 and < 1.0.3

Fixed in: 0.11.3, 0.12.4, 0.13.2, 1.0.3

Safe to downgrade to: a release before 0.12.0

1. Check installed version

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

2. UPGRADE to 0.11.3 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade uri

Note

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

3. If no update is available yet, DOWNGRADE to a release before 0.12.0 (Debian / Ubuntu)

apt-cache madison uri sudo apt install uri=<VERSION_BEFORE_0.12.0> sudo apt-mark hold uri

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list uri sudo dnf downgrade uri-<VERSION_BEFORE_0.12.0> sudo dnf versionlock add uri

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2025-27221?

uri: upgrade to 0.11.3, 0.12.4, 0.13.2, 1.0.3. Exact commands for each OS are on this page.

Is CVE-2025-27221 being exploited?

CVE-2025-27221 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-2025-27221 affect?

CVE-2025-27221 affects uri. Severity is low (CVSS 3.2). In the URI gem before 1.0.3 for Ruby, the URI handling methods (URI.join, URI#merge, URI#+) have an inadvertent leakage of authentication credentials because userinfo is retained even after changing the host.

How urgent is CVE-2025-27221?

Priority 22/100. No elevated risk signals yet.

Software pages

Ruby vulnerabilities

Related CVEs

CVE-2025-61594 HIGH 7.5 UPGRADE URI is a module providing classes to handle Uniform Resource Identifiers

References

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