Security readout for executives and security teams
Plain-English summary
Loofah versions before 2.19.1 can be forced into excessive recursion while sanitizing CDATA, causing stack exhaustion and service failure. The business risk is availability: exposed applications that sanitize attacker-controlled HTML or XML may become unstable or unavailable.
Executive priority
Treat as a high-priority availability fix for internet-facing or customer-content services using Loofah. It does not indicate data theft or code execution in the provided sources, but a reliable crash path can still create operational disruption.
Technical view
CVE-2022-23516 is a CWE-674 uncontrolled recursion flaw in Loofah >= 2.2.0 and < 2.19.1. Recursive CDATA sanitization can raise SystemStackError and consume CPU, producing denial of service. The published fix is Loofah 2.19.1.
Likely exposure
Exposure is likely in Ruby applications or packaged environments using vulnerable Loofah versions to sanitize untrusted HTML/XML fragments, especially where user-controlled CDATA reaches sanitization paths. Evidence does not identify other affected products beyond Loofah and downstream Debian package handling.
Exploitation context
The CVSS vector is network-accessible, low complexity, no privileges, no user interaction, with high availability impact. The source bundle does not show CISA KEV listing or confirmed active exploitation, so exploitation should be treated as plausible but not proven active.
Researcher notes
Focus validation on version range and reachability of CDATA sanitization. Avoid assuming exploit-in-the-wild status. Debian advisories indicate downstream maintenance activity, but the core upstream remediation named in the bundle is Loofah 2.19.1.
Mitigation direction
- Upgrade Loofah to 2.19.1 or a vendor-supported fixed package.
- If upgrade is blocked, limit sanitized string length as vendor advisory suggests.
- Prioritize services sanitizing externally supplied HTML, XML, or CDATA content.
- Check Debian LTS advisories if consuming Loofah from Debian packages.
Validation and detection
- Inventory Ruby dependency manifests and lockfiles for Loofah versions.
- Confirm deployed artifacts resolve Loofah outside the vulnerable range.
- Identify code paths that sanitize untrusted HTML/XML input.
- Review monitoring for SystemStackError or unusual sanitizer CPU spikes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-674: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2022-23516 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/flavorjones/loofah/security/advisories/GHSA-3x8r-x6xp-q4vmCVE reference · x_refsource_CONFIRM
- https://lists.debian.org/debian-lts-announce/2023/09/msg00011.htmlCVE reference
- https://lists.debian.org/debian-lts-announce/2024/09/msg00044.htmlCVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Uncontrolled Recursion
Uncontrolled Recursion represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.