CVE-2023-28755 — uri
MEDIUMCVE-2023-28755 is a medium-severity (CVSS 5.3) CWE-1333 vulnerability in uri. A fix is available for uri — see the affected versions and patch details below.
Ruby URI component ReDoS issue
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2023-28755.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
uri💎uri💎uri💎uriReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects RubyGems packages — download data is not available via public APIs for these ecosystems.
Description
A ReDoS issue was discovered in the URI component through 0.12.0 in Ruby through 3.2.1. The URI parser mishandles invalid URLs that have specific characters. It causes an increase in execution time for parsing strings to URI objects. The fixed versions are 0.12.1, 0.11.1, 0.10.2 and 0.10.0.1.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 💎RubyGems | uri | ≥ 0.12.0&&< 0.12.1 | 0.12.1bundle update uri --conservative |
| 💎RubyGems | uri | ≥ 0.11.0&&< 0.11.1 | 0.11.1bundle update uri --conservative |
| 💎RubyGems | uri | ≥ 0.10.1&&< 0.10.2 | 0.10.2bundle update uri --conservative |
| 💎RubyGems | uri | all versions | 0.10.0.1bundle update uri --conservative |
Affected Products
debian linuxdebianfedorafedoraprojecturiruby-langDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for uri, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update uri to 0.12.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-28755 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Enterprise Linux 8 | ruby:2.7-8080020230427102918.63b34585 | RHSA-2023:3821 |
| Red Hat Enterprise Linux 8 | ruby:2.5-8090020230627084142.b46abd14 | RHSA-2023:7025 |
| Red Hat Enterprise Linux 8 | ruby:3.1-8090020240311122605.a75119d5 | RHSA-2024:1431 |
| Red Hat Enterprise Linux 8 | ruby:3.0-8100020240522072634.489197e6 | RHSA-2024:3500 |
| Red Hat Enterprise Linux 9 | ruby:3.1-9030020240320163942.9 | RHSA-2024:1576 |
| Red Hat Enterprise Linux 9 | ruby-0:3.0.7-162.el9_4 | RHSA-2024:3838 |
| Red Hat Software Collections for Red Hat Enterprise Linux 7 | rh-ruby27-ruby-0:2.7.8-132.el7 | RHSA-2023:3291 |
Frequently Asked Questions
Is CVE-2023-28755 in your dependencies?
Find it across RubyGems, including transitive dependencies.