CVE-2022-31110Public exploitNetwork attack vector

Service hang via user-controlled regular expressions

Published Jun 29, 2022 · Updated Apr 22, 2025

ReDoS in RSSHub before commit 5c4177441417 allows remote attackers to hang the service through crafted filter parameters. The parameter middleware constructs JavaScript RegExp objects directly from filter and filterout query values, then passes them to String.match without a timeout. Unauthenticated network access to any route is sufficient unless access control is added; one request can occupy a CPU core for hours and leave the instance unresponsive.

CVSS severity5.3
Medium
EPSS probability1.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

ReDoS in RSSHub before commit 5c4177441417 allows remote attackers to hang the service through crafted filter parameters. The parameter middleware constructs JavaScript RegExp objects directly from filter and filterout query values, then passes them to String.match without a timeout. Unauthenticated network access to any route is sufficient unless access control is added; one request can occupy a CPU core for hours and leave the instance unresponsive.

The record

CVE
CVE-2022-31110
Published
Jun 29, 2022
Updated
Apr 22, 2025
Vendor
DIYgod
Product
RSSHub
Classifications
CWE-400, CWE-1333, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=commits prior to 5c4177441417b44a6e45c3c63e9eac2504abeb5b

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

DIYgod · RSSHubversion=commits prior to 5c4177441417b44a6e45c3c63e9eac2504abeb5b

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-1333Inefficient Regular Expression Complexity
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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