CVE-2023-28846Network attack vector

Service interruption via unbounded URL response header

Published Mar 30, 2023 · Updated Feb 11, 2025

Uncontrolled resource consumption in Unpoly unpoly-rails before 2.7.2.2 allows remote attackers to interrupt service with a long URL. The set_up_request_echo_headers method copies the unbounded request URL into X-Up-Location instead of limiting or omitting the user-controlled value. The Rails application must sit behind a load balancer using passive health checks; an oversized response header can cause that instance's temporary removal.

CVSS severity7.5
High
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in Unpoly unpoly-rails before 2.7.2.2 allows remote attackers to interrupt service with a long URL. The set_up_request_echo_headers method copies the unbounded request URL into X-Up-Location instead of limiting or omitting the user-controlled value. The Rails application must sit behind a load balancer using passive health checks; an oversized response header can cause that instance's temporary removal.

The record

CVE
CVE-2023-28846
Published
Mar 30, 2023
Updated
Feb 11, 2025
Vendor
Unpoly
Product
unpoly-rails
Classifications
CWE-400, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.7.2.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Unpoly · unpoly-railsversion=< 2.7.2.2

Published CVSS scores

5.9GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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