CVE-2023-33289: The urlnorm crate through 0.1.4 for Rust allows Regular Expression Denial of Service (ReDos) via a crafted URL

Q: How do I fix CVE-2023-33289?

urlnorm: upgrade to newer than 0.1.4. Exact commands for each OS are on this page.

Q: Is CVE-2023-33289 being exploited?

CVE-2023-33289 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-2023-33289 affect?

CVE-2023-33289 affects urlnorm. Severity is high (CVSS 7.5). The urlnorm crate through 0.1.4 for Rust allows Regular Expression Denial of Service (ReDos) via a crafted URL to lib.rs. NOTE: the Supplier disputes this, taking the position that "Slow printing of URLs is not a CVE."

Q: How urgent is CVE-2023-33289?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2023-33289 is a high-severity flaw (CVSS 7.5) affecting urlnorm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The urlnorm crate through 0.1.4 for Rust allows Regular Expression Denial of Service (ReDos) via a crafted URL to lib.rs. NOTE: the Supplier disputes this, taking the position that "Slow printing of URLs is not a CVE."

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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-1333
Published	2023-06-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: urlnorm project

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

Am I affected?

Timeline

2023-06-21 20:15 UTCPublished CVE record published
2026-06-17 06:01 UTCUpdated Record last modified

urlnorm project urlnorm UPGRADE

Affected: <= 0.1.4

Fixed in: newer than 0.1.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 0.1.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade urlnorm

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-2023-33289?

urlnorm: upgrade to newer than 0.1.4. Exact commands for each OS are on this page.

Is CVE-2023-33289 being exploited?

CVE-2023-33289 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-2023-33289 affect?

CVE-2023-33289 affects urlnorm. Severity is high (CVSS 7.5). The urlnorm crate through 0.1.4 for Rust allows Regular Expression Denial of Service (ReDos) via a crafted URL to lib.rs. NOTE: the Supplier disputes this, taking the position that "Slow printing of URLs is not a CVE."

How urgent is CVE-2023-33289?

Priority 53/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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