node-forge <=1.3 Ed25519 Sig Verify Malleability flaw
CVE-2026-33895 Published on March 27, 2026

Forge has signature forgery in Ed25519 due to missing S > L check
Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, Ed25519 signature verification accepts forged non-canonical signatures where the scalar S is not reduced modulo the group order (`S >= L`). A valid signature and its `S + L` variant both verify in forge, while Node.js `crypto.verify` (OpenSSL-backed) rejects the `S + L` variant, as defined by the specification. This class of signature malleability has been exploited in practice to bypass authentication and authorization logic (see CVE-2026-25793, CVE-2022-35961). Applications relying on signature uniqueness (i.e., dedup by signature bytes, replay tracking, signed-object canonicalization checks) may be bypassed. Version 1.4.0 patches the issue.

NVD

Vulnerability Analysis

CVE-2026-33895 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. An automatable proof of concept (POC) exploit exists. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, a high impact on integrity, and no impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
HIGH
Availability Impact:
NONE

Weakness Type

Improper Verification of Cryptographic Signature

The software does not verify, or incorrectly verifies, the cryptographic signature for data.


Products Associated with CVE-2026-33895

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2026-33895 are published in these products:

Digitalbazaar Forge
 
Red Hat Ansible Automation Platform
 
Red Hat Ansible Automation Platform Developer
 
Red Hat Ansible Automation Platform Inside
 
Red Hat Rhdh
 
Red Hat Logging
 
Red Hat Service Registry
 
Red Hat Podman Desktop
 
Red Hat Jboss Data Grid
 
Red Hat Jboss Fuse
 
Red Hat Quay
 
Red Hat Cryostat
 
Red Hat Apache Camel Hawtio
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Jboss Enterprise Bpms Platform
 

Affected Versions

digitalbazaar forge: Red Hat Ansible Automation Platform 2.5 for RHEL 8: Red Hat Ansible Automation Platform 2.5 for RHEL 9: Red Hat Developer Hub 1.8: Red Hat Developer Hub 1.9: Logging Subsystem for Red Hat OpenShift: Red Hat build of Apicurio Registry 2: Red Hat Build of Podman Desktop: Red Hat Data Grid 8: Red Hat Fuse 7: Red Hat Quay 3: Red Hat Cryostat 4: Red Hat Ansible Automation Platform 2: Red Hat build of Apache Camel - HawtIO 4: Red Hat Enterprise Linux 10: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 9: Red Hat Process Automation 7:

Exploit Probability

EPSS
0.26%
Percentile
16.59%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.