CVE-2026-61848
Description
A flaw was found in crass. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) through excessive CPU resource consumption. When parsing input containing non-ASCII characters, inefficiencies in tracking the positions of multi-byte characters result in disproportionately long processing times. An attacker can exploit this issue by submitting specially crafted Cascading Style Sheets (CSS) input with many non-ASCII characters, causing the application to hang or become unresponsive.
Statement
Red Hat rates this vulnerability as Moderate severity because exploitation results strictly in a denial of service through elevated CPU utilization, without risking system confidentiality or data integrity. The affected component is consumed as an internal Ruby dependency across services such as Red Hat Satellite and 3scale to process style content. Triggering the condition requires an application endpoint to accept and parse untrusted multi-byte styling payloads, which may exhaust worker threads but does not permit code execution or privilege escalation.
Mitigation
Upstream workaround: avoid passing non-ASCII input to Crass.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | None | N/A | N/A |
| Availability Impact | Low | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
When allocating resources without limits, an attacker could prevent other systems, applications, or processes from accessing the same type of resource. It can be easy for an attacker to consume many resources by rapidly making many requests or causing larger resources to be used than is needed.
Frequently Asked Questions
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