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Denial of Service Vulnerability in CyberChef

Moderate
GCHQDeveloper581 published GHSA-hjwj-84x5-h7gr Aug 29, 2026

Package

npm cyberchef (npm)

Affected versions

<11.1.1

Patched versions

11.1.1
docker ghcr.io/gchq/cyberchef (Docker)
< 11.1.1
11.1.1

Description

A Denial of Service vulnerability has been found in CyberChef

The Generate Lorem Ipsum operation has a denial of service vulnerability due to a lack of bounds check on the Length parameter

Impact

Impact when running interactively in browser is Low as in the worst case the browser tab will crash.

The problem is potentially more serious when CyberChef is running as a Node backend. The resource exhaustion/crash from this DoS issues could lead to a backend server crashing or otherwise terminating resulting in loss of availability until the server is restarted.

Patches

Patched in #2557 and released in v11.1.1

Workarounds

Patch from the PR mentioned above can be manually applied to a local code base

References

Github Issue #2556
Github PR #2557

Github commit 894560f

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVE ID

No known CVE

Weaknesses

Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. Learn more on MITRE.

Credits