CVE-2026-48758
sigstore-js: DSSE payloadType type-binding failure
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.
INFO
Published Date :
July 14, 2026, 9:17 p.m.
Last Modified :
Oct. 24, 2026, 9:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-48758
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update sigstore-js libraries to version 3.2.1.
- Verify the integrity of the signature and type binding.
- Review and re-sign affected artifacts if necessary.
Public PoC/Exploit Available at Github
CVE-2026-48758 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-48758.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-48758 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-48758
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Dockerfile
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-48758 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-48758 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 24, 2026
Action Type Old Value New Value Added Translation Title: sigstore-js de sigstore, Description: sigstore-js proporciona bibliotecas JavaScript para interactuar con los servicios Sigstore. Antes de la 3.2.1, la función preAuthEncoding en @sigstore/core utiliza la codificación ascii de Node.js al convertir la cadena PAE a bytes, permitiendo que payloadType sea mutado después de la firma sin invalidar la firma y rompiendo la garantía de vinculación de tipo que DSSE está diseñado para proporcionar. Este problema está solucionado en la versión 3.2.1. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 15, 2026
Action Type Old Value New Value Added Reference https://github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c Added SSVC {'id': 'CVE-2026-48758', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-15T12:54:43.124124Z'} -
New CVE Received by [email protected]
Jul. 14, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'sigstore', 'product': 'sigstore-js', 'versions': [{'status': 'affected', 'version': '< 3.2.1'}]}] Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L Added CWE CWE-347 Added Reference https://github.com/sigstore/sigstore-js/commit/b5aa4f1f8d2db0a9dfa6430fb114d9c2f1c304f7 Added Reference https://github.com/sigstore/sigstore-js/pull/1657 Added Reference https://github.com/sigstore/sigstore-js/releases/tag/%40sigstore%2Fcore%403.2.1 Added Reference https://github.com/sigstore/sigstore-js/security/advisories/GHSA-jfc7-64v2-mr8c