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CVE-2023-28846

23
FAUCET Score

CVE-2023-28846 is a Denial of Service (DoS) vulnerability affecting the unpoly-rails gem in Rails applications that use Unpoly as a JavaScript framework. An attacker can craft exceedingly long URLs, causing the application to generate oversized X-Up-Location response headers. This can lead to load balancers removing the affected application instance from service, causing temporary unavailability. The vulnerability has a CVSS score of 7.5 (HIGH), indicating a network-based attack with low complexity and high impact on availability, but no impact on confidentiality or integrity. It is categorized as CWE-400 (Uncontrolled Resource Consumption). There is currently no evidence of active exploitation, and no public exploit code or Metasploit modules are available. Community discussion and media coverage for this CVE are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.7.2.2CPE matchmatch criteria
cpe:2.3:a:unpoly:unpoly-rails:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.03%
Probability of exploitation in next 30 days
EPSS Percentile
60.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0103 is in the 37th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
rubygemspatch availablevia ghsa
Product: unpoly-railsFixed in: 2.7.2.2

Vendor Advisories (1)

rubygemsGHSA-m875-3xf6-mf78medium

unpoly-rails Denial of Service vulnerability

Mar 30, 2023

References

docs.nginx.com / nginx/admin-guide/load-balancer/http-health-check
Technical Description
github.com / unpoly/unpoly-rails
Product
github.com / unpoly/unpoly-rails/commit/cd9ad0007daceeb3b2354fdcab4f88350427bf16
PatchVendor Advisory
github.com / unpoly/unpoly-rails/security/advisories/GHSA-m875-3xf6-mf78
Vendor Advisory
makandracards.com / operations/537537-nginx-proxy-buffer-tuning
Third Party Advisory
tryhexadecimal.com / guides/http/414-request-uri-too-long
Third Party Advisory
unpoly.com / up.protocol
Product