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CVE-2026-33894— Forge has signature forgery in RSA-PKCS due to ASN.1 extra field

Quick assessment

Affected
digitalbazaar forge
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Digital Bazaar Forge是美国Digital Bazaar公司的一个 Tls 在 Javascript 中的本机实现以及用于编写基于加密和网络密集型 Web 应用程序的开源工具。 Digital Bazaar Forge 1.4.0之前版本存在数据伪造问题漏洞，该漏洞源于RSASSA PKCS#1 v1.5签名验证接受低公共指数密钥的伪造签名，可能导致Bleichenbacher风格伪造攻击。

CVSS 7.5 · High EPSS 0.45% · P37

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
digitalbazaar forge < 1.4.0 affected
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I. Basic Information for CVE-2026-33894

Vulnerability Information
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Vulnerability Title
Forge has signature forgery in RSA-PKCS due to ASN.1 extra field
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Digital Bazaar Forge 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Digital Bazaar Forge是美国Digital Bazaar公司的一个 Tls 在 Javascript 中的本机实现以及用于编写基于加密和网络密集型 Web 应用程序的开源工具。 Digital Bazaar Forge 1.4.0之前版本存在数据伪造问题漏洞，该漏洞源于RSASSA PKCS#1 v1.5签名验证接受低公共指数密钥的伪造签名，可能导致Bleichenbacher风格伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
digitalbazaar forge < 1.4.0 -

II. Public POCs for CVE-2026-33894

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III. Intelligence Information for CVE-2026-33894

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Vendor Advisories for CVE-2026-33894 (1)

Mailing List Discussions for CVE-2026-33894 (1)

Same Patch Batch · digitalbazaar · 2026-03-27 · 4 CVEs total

CVE-2026-33891 7.5 HIGH Forge has Denial of Service via Infinite Loop in BigInteger.modInverse() with Zero Input
CVE-2026-33895 7.5 HIGH Forge has signature forgery in Ed25519 due to missing S > L check
CVE-2026-33896 7.4 HIGH Forge has a basicConstraints bypass in its certificate chain verification (RFC 5280 violat

IV. Related Vulnerabilities

Same product: forge
Same vendor: digitalbazaar
Same weakness: CWE-347

V. Comments for CVE-2026-33894

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