CVE-2023-28846: Unpoly is a JavaScript framework for server-side web applications

Q: How do I fix CVE-2023-28846?

unpoly-rails: upgrade to 2.7.2.2. Exact commands for each OS are on this page.

Q: Is CVE-2023-28846 being exploited?

CVE-2023-28846 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-2023-28846 affect?

CVE-2023-28846 affects unpoly-rails. Severity is medium (CVSS 5.9). Unpoly is a JavaScript framework for server-side web applications. There is a possible Denial of Service (DoS) vulnerability in the `unpoly-rails` gem that implements the Unpoly server protocol for Rails applications. This issues affects Ra

Q: How urgent is CVE-2023-28846?

Priority 42/100. Remotely exploitable, no login, no user action

This month

MEDIUM 5.9REMOTEUPGRADE

CVE-2023-28846 is a medium-severity flaw (CVSS 5.9) affecting unpoly-rails. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unpoly is a JavaScript framework for server-side web applications. There is a possible Denial of Service (DoS) vulnerability in the `unpoly-rails` gem that implements the Unpoly server protocol for Rails applications. This issues affects Rails applications that operate as an upstream of a load balancer's that uses passive health checks. The `unpoly-rails` gem echoes the request URL as an `X-Up-Location` response header. By making a request with e

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-400
Published	2023-03-30
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: unpoly

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

Am I affected?

Timeline

2023-03-30 20:15 UTCPublished CVE record published
2026-06-17 05:48 UTCUpdated Record last modified

unpoly unpoly-rails UPGRADE

Affected: < 2.7.2.2

Fixed in: 2.7.2.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy unpoly-rails || rpm -q unpoly-rails || unpoly-rails --version

2. UPGRADE to 2.7.2.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade unpoly-rails

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade unpoly-rails

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-2023-28846?

unpoly-rails: upgrade to 2.7.2.2. Exact commands for each OS are on this page.

Is CVE-2023-28846 being exploited?

CVE-2023-28846 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-2023-28846 affect?

CVE-2023-28846 affects unpoly-rails. Severity is medium (CVSS 5.9). Unpoly is a JavaScript framework for server-side web applications. There is a possible Denial of Service (DoS) vulnerability in the `unpoly-rails` gem that implements the Unpoly server protocol for Rails applications. This issues affects Ra

How urgent is CVE-2023-28846?

Priority 42/100. Remotely exploitable, no login, no user action

Software pages

Ruby on Rails vulnerabilities

References

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