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Node.js EUVDEUVD-2026-44501

| CVE-2026-48758 MEDIUM
Improper Verification of Cryptographic Signature (CWE-347)
2026-06-26 https://github.com/sigstore/sigstore-js GHSA-jfc7-64v2-mr8c
Information Disclosure Node.js Red Hat Jwt Attack Suse
5.4
CVSS 3.1 · Vendor: https://github.com/sigstore/sigstore-js
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Severity by source

Vendor (https://github.com/sigstore/sigstore-js) PRIMARY
5.4 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
SUSE
MEDIUM
qualitative
Red Hat
5.4 MEDIUM
qualitative

Primary rating from Vendor (https://github.com/sigstore/sigstore-js).

CVSS VectorVendor: https://github.com/sigstore/sigstore-js

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

Lifecycle Timeline

2
Source Code Evidence Fetched
Jun 26, 2026 - 19:52 vuln.today
Analysis Generated
Jun 26, 2026 - 19:52 vuln.today

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 4,117 npm packages depend on @sigstore/core (356 direct, 3,762 indirect)

Ecosystem-wide dependent count for version 3.2.1.

DescriptionCVE.org

Impact

The preAuthEncoding function in @sigstore/core uses Node.js 'ascii' encoding when converting the PAE (Pre-Authentication Encoding) string to bytes. This allows payloadType to be mutated after signing without invalidating the signature, breaking the type-binding guarantee that DSSE is designed to provide.

In packages/core/src/dsse.ts, the PAE function builds a string containing payloadType and then encodes it with Buffer.from(prefix, 'ascii').

In Node.js, 'ascii' encoding for string-to-Buffer is equivalent to 'latin1', which truncates characters above U+00FF to their low byte. This means for any ASCII character, there exist Unicode characters (at U+01xx, U+02xx, etc.) that produce the identical encoded byte:

OriginalCodepointMutantCodepointEncoded byte
tU+0074ŴU+01740x74
eU+0065ťU+01650x65

An attacker can substitute every character in payloadType with a Unicode variant whose low byte matches, producing identical PAE bytes and a passing signature verification.

Additionally, payloadType.length returns the JavaScript string length (UTF-16 code units) rather than the UTF-8 byte length required by the DSSE spec, though this is only a contributing factor for non-ASCII types.

Reproduction
javascript
const { preAuthEncoding } = require('@sigstore/core/dist/dsse.js');
const payload = Buffer.from('hello world');

const original = preAuthEncoding('text/plain', payload);
// U+01xx chars whose low bytes match the original ASCII chars
const mutant = preAuthEncoding('\u0174\u0165\u0178\u0174/\u0170\u016c\u0161\u0169\u016e', payload);

console.log('PAE bytes equal:', original.equals(mutant)); // true - should be false

AnalysisAI

Signature type-binding bypass in @sigstore/core (npm) allows an attacker who controls the payloadType field of a DSSE envelope to substitute every ASCII character with a Unicode variant whose low byte matches, producing PAE bytes identical to a legitimate signature and causing verification to pass for a mismatched content type. All versions up to and including 3.2.0 are affected; a working proof-of-concept is included in the GitHub security advisory GHSA-jfc7-64v2-mr8c. The vulnerability is not confirmed in the CISA KEV catalog, but exploit code is publicly available, making exploitation straightforward for any attacker positioned to craft or relay DSSE envelopes.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise High Performance Computing 12 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Not-Affected

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EUVD-2026-44501 vulnerability details – vuln.today
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