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CVE-2023-31606

23
FAUCET Score

CVE-2023-31606 describes a Regular Expression Denial of Service (ReDoS) vulnerability within the sanitize_html function of the redcloth gem, version 4.0.0, affecting promptworks redcloth. This flaw allows an unauthenticated attacker to trigger a Denial of Service (DoS) by submitting a specially crafted payload. With a CVSS score of 7.5 (High), the vulnerability is easily exploitable over the network with low attack complexity, leading to a complete loss of availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.0.0, <= 4.3.2CPE matchmatch criteria
cpe:2.3:a:promptworks:redcloth:*:*:*:*:*:ruby:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.51%
Probability of exploitation in next 30 days
EPSS Percentile
71.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0151 is in the 53rd percentile among its peer group of 51,551 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)

rubygemspatch availablevia ghsa
Product: RedClothFixed in: 4.3.3
redhatno patchvia redhat_api
Product: Red Hat 3scale API Management Platform 2Fixed in: 3scale-amp-system

Vendor Advisories (2)

rubygemsGHSA-qcm3-vfq5-wfr2high

RedCloth Regular Expression Denial of Service issue

Jun 6, 2023
redhatCVE-2023-31606Important

RedCloth: Regular expression denial of service in sanitize_html function

Jun 6, 2023

References

github.com / e23e/CVE-2023-31606
ExploitThird Party Advisory
github.com / jgarber/redcloth
Product
github.com / jgarber/redcloth/issues/73
ExploitIssue TrackingThird Party Advisory
lists.debian.org / debian-lts-announce/2023/07/msg00002.html
security.gentoo.org / glsa/202401-14