CVE-2026-48758 (MEDIUM): detected in Lambda Docker Images.

## CVE Details

| **CVE ID** | **Severity** | **Affected Package** | **Installed Version** | **Fixed Version** | **Date Published** | **Date of Scan** |
|-----------------|--------------|----------------------|-----------------------|-------------------|--------------------|------------------|
| [CVE-2026-48758](https://avd.aquasec.com/nvd/cve-2026-48758) | `MEDIUM` | `@sigstore/core` | `2.0.0` | `3.2.1` | `2026-07-14T21:17:01.113Z` | `2026-07-15T10:18:18.360065213Z` |

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## Affected Docker Images

| **Image Name** | **SHA** |
|-----------------------------|---------------------------------------|
| `public.ecr.aws/lambda/nodejs:22` | `public.ecr.aws/lambda/nodejs@sha256:4330d56e02e084caa74a94ed3ce6b16c5d5e00fd2bc11bbfcb8d7de8357f5471` |

---

## 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.

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### Remediation Steps
- Update the affected package `@sigstore/core` from version `2.0.0` to `3.2.1`.

### About this issue
- This issue may not contain all the information about the CVE nor the images it affects.
- This issue will not be updated with new information and the list of affected images may have changed since the creation of this issue.
- For more, visit [Lambda Watchdog](https://lambdawatchdog.com).
- This issue was created automatically by Lambda Watchdog.

Locate the build definition for the public.ecr.aws/lambda/nodejs:22 image and the dependency metadata containing @sigstore/core 2.0.0. Update it to 3.2.1, rebuild the image, and verify that the affected package version is no longer present in the resulting image.

Written by the indexing model from the issue text.