High severity · published Mar 27, 2026
CVE-2026-33894
Forge has signature forgery in RSA-PKCS due to ASN.1 extra field
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
Forge (also called `node-forge`) is a native implementation of Transport Layer Security in JavaScript. Prior to version 1.4.0, RSASSA PKCS#1 v1.5 signature verification accepts forged signatures for low public exponent keys (e=3). Attackers can forge signatures by stuffing “garbage” bytes within the ASN structure in order to construct a signature that passes verification, enabling Bleichenbacher style forgery. This issue is similar to CVE-2022-24771, but adds bytes in an addition field within the ASN structure, rather than outside of it. Additionally, forge does not validate that signatures include a minimum of 8 bytes of padding as defined by the specification, providing attackers additional space to construct Bleichenbacher forgeries. Version 1.4.0 patches the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 41% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FO
forge · digitalbazaar
< 1.4.0 · source: vendor, NVD
CO
Cluster Observability Operator 1.5.0 · Red Hat
All versions, or not specified · source: CISA
LS
Logging Subsystem for Red Hat OpenShift · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Ansible Automation Platform 2 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Ansible Automation Platform 2.5 for RHEL 8 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Ansible Automation Platform 2.5 for RHEL 9 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Build of Podman Desktop · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Data Grid 8 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Developer Hub 1.8 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Developer Hub 1.9 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Fuse 7 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-33894
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-33894
Third Party Advisory
https://datatracker.ietf.org/doc/html/rfc2313#section-8
Vendor Advisory
https://github.com/digitalbazaar/forge/security/advisories/GHSA-ppp5-5v6c-4jwp
Third Party Advisory
https://mailarchive.ietf.org/arch/msg/openpgp/5rnE9ZRN1AokBVj3VqblGlP63QE
Third Party Advisory
https://www.rfc-editor.org/rfc/rfc8017.html
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:13826
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:19375
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