CVE-2023-36617: A ReDoS issue was discovered in the URI component before 0.12.2 for Ruby

This month

MEDIUM 5.3REMOTEUPGRADE

CVE-2023-36617 is a medium-severity flaw (CVSS 5.3) affecting uri. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A ReDoS issue was discovered in the URI component before 0.12.2 for Ruby. The URI parser mishandles invalid URLs that have specific characters. There is an increase in execution time for parsing strings to URI objects with rfc2396_parser.rb and rfc3986_parser.rb. NOTE: this issue exists becuse of an incomplete fix for CVE-2023-28755. Version 0.10.3 is also a fixed version.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-1333
Published	2023-06-29
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

2023-06-29 13:15 UTCPublished CVE record published
2026-06-17 06:06 UTCUpdated Record last modified

ruby-lang uri UPGRADE

Affected: < 0.10.3 · >= 0.11.0 and < 0.12.2

Fixed in: 0.10.3, 0.12.2

Safe to downgrade to: a release before 0.11.0

1. Check installed version

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

2. UPGRADE to 0.10.3 (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 0.11.0 (Debian / Ubuntu)

apt-cache madison uri sudo apt install uri=<VERSION_BEFORE_0.11.0> 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_0.11.0> 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-2023-36617?

uri: upgrade to 0.10.3, 0.12.2. Exact commands for each OS are on this page.

Is CVE-2023-36617 being exploited?

CVE-2023-36617 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-2023-36617 affect?

CVE-2023-36617 affects uri. Severity is medium (CVSS 5.3). A ReDoS issue was discovered in the URI component before 0.12.2 for Ruby. The URI parser mishandles invalid URLs that have specific characters. There is an increase in execution time for parsing strings to URI objects with rfc2396_parser.rb

How urgent is CVE-2023-36617?

Priority 43/100. Remotely exploitable, no login, no user action

Software pages

Ruby vulnerabilities

Related CVEs

CVE-2025-61594 HIGH 7.5 UPGRADE URI is a module providing classes to handle Uniform Resource Identifiers
CVE-2025-27221 LOW 3.2 UPGRADE In the URI gem before 1.0.3 for Ruby, the URI handling methods (URI.join, URI#merge, URI#+) have an inadverten
CVE-2023-28755 MEDIUM 5.3 UPGRADE MITIGATE A ReDoS issue was discovered in the URI component through 0.12.0 in Ruby through 3.2.1
CVE-2023-28628 MEDIUM 5.4 UPGRADE lambdaisland/uri is a pure Clojure/ClojureScript URI library

References

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