🛡️ CVE-2023-31606 — redcloth

🟠 CVSS 8.0 — High ⚠️ Exploit Public CWE-1333 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

RedCloth Regular Expression Denial of Service issue

A Regular Expression Denial of Service (ReDoS) issue was discovered in the sanitize_html function of RedCloth gem. This vulnerability allows attackers to cause a Denial of Service (DoS) via supplying a crafted payload.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2023-31606 is classified as CWE-1333: Inefficient Regular Expression Complexity. A regular expression backtracks catastrophically on crafted input, consuming CPU out of proportion to input size.

Affected software

CVE-2023-31606 is recorded against 1 package.

  • redcloth (fixed in 4.3.3)

Timeline and source

Published on 6 June 2023 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Web)
github.com (Package)
github.com (Web)
github.com (Web)
lists.debian.org (Web)
security.gentoo.org (Web)

CVE-2023-31606 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-1333
Public Exploit ⚠️ Yes
Source OSV
Published 2023-06-06
Updated 2026-08-12
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
redcloth — 4.3.3

Exploit Protection

Are you running redcloth?

CVE-2023-31606 carries CVSS 8.0 High rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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