sigstore sigstore-js up to 3.2.0 Core preAuthEncoding Remote Code Execution

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k1.37

Summaryinfo

A vulnerability labeled as critical has been found in sigstore sigstore-js up to 3.2.0. This affects the function preAuthEncoding of the component Core. Such manipulation leads to Remote Code Execution. This vulnerability is documented as CVE-2026-48758. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in sigstore sigstore-js up to 3.2.0. Affected by this issue is the function preAuthEncoding of the component Core. The manipulation with an unknown input leads to a remote code execution vulnerability. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-48758 since 05/22/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 3.2.1 eliminates this vulnerability.

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Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Remote Code Execution
CWE: Unknown
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: sigstore-js 3.2.1

Timelineinfo

05/22/2026 CVE reserved
07/14/2026 +53 days VulDB entry created
07/15/2026 +0 days Advisory disclosed
07/15/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-48758 (🔒)
GCVE (CVE): GCVE-0-2026-48758
GCVE (VulDB): GCVE-100-379046

Entryinfo

Created: 07/15/2026 01:46
Changes: 07/15/2026 01:46 (53)
Complete: 🔍
Cache ID: 216::103

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