CVE-2026-48758

sigstore-js: DSSE payloadType type-binding failure

Published: Jul 14, 2026Updated: Jul 15, 2026 Sources: CVE List NVDCWE-347

5.4MEDIUM

Description

sigstore-js provides JavaScript libraries for interacting with Sigstore services. Prior to 3.2.1, the preAuthEncoding function in @sigstore/core uses Node.js ascii encoding when converting the PAE string to bytes, allowing payloadType to be mutated after signing without invalidating the signature and breaking the type-binding guarantee that DSSE is designed to provide. This issue is fixed in version 3.2.1.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:LIntegrity

Low

A:LAvailability

Low

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Weaknesses

CWE-347

Affected Products

sigstore

oss-projectaka cosign, rekor, gitsign

sigstore-jsOn-prem

Security Products / pki-crypto

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Collection

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References

https://github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7

github.com

https://github.com/sigstore/sigstore-js/pull/1657

github.com

https://github.com/sigstore/sigstore-js/releases/tag/%40sigstore%2Fcore%403.2.1

github.com

and 1 more references View all →

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