node-forge RSA PKCS#1 v1.5 signature verification accepts extra nested DigestAlgorithm elements

CAO 7.5CVE-2026-33894 · CVE-2026-85393 · GHSA-86w9-cpqp-85rv · Công bố 27/03/2026 · cập nhật 26/10/2026

Tóm tắt nhanh

CVE-2026-33894 là lỗ hổng mức CAO (CVSS 7.5) ảnh hưởng forge (digitalbazaar), node-forge.
Xác suất bị khai thác trong 30 ngày tới (EPSS): 0.48%, cao hơn 41.5% các lỗ hổng khác.
Cách xử lý: cập nhật lên 1.4.0 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
forge digitalbazaar	`< 1.4.0`	`1.4.0`
node-forge npm	`≤ 1.4.0< 1.4.0`	`1.4.0`

Mô tả

node-forge through 1.4.0 fails to validate element count in nested DigestAlgorithm sequences during RSA PKCS#1 v1.5 signature verification. Attackers can embed garbage bytes inside the DigestAlgorithm sequence to forge valid signatures for arbitrary messages using low-exponent RSA keys. This is an incomplete fix for CVE-2026-33894.

Mô tả của NVD

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.