---
id: GHSA-77vh-xpmg-72qh
title: Clarify `mediaType` handling
summary: Clarify `mediaType` handling
severity: low
cvss: 3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:N/I:L/A:N'
vendor: opencontainers
product: github.com/opencontainers/image-spec
ecosystem: go
affected:
  - github.com/opencontainers/image-spec < 1.0.2
patched:
  - github.com/opencontainers/image-spec 1.0.2
published: '2021-11-18'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T03:49:09.703536006Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-77vh-xpmg-72qh'
references:
  - url: >-
      https://github.com/opencontainers/distribution-spec/security/advisories/GHSA-mc8v-mgrf-8f4m
  - url: >-
      https://github.com/opencontainers/image-spec/security/advisories/GHSA-77vh-xpmg-72qh
  - url: >-
      https://github.com/opencontainers/image-spec/commit/693428a734f5bab1a84bd2f990d92ef1111cd60c
  - url: 'https://github.com/opencontainers/image-spec'
  - url: 'https://github.com/opencontainers/image-spec/releases/tag/v1.0.2'
tags:
  - osv
  - go
ingestedAt: '2026-09-12T03:13:01.763Z'
---

## Overview

### Impact
In the OCI Image Specification version 1.0.1 and prior, manifest and index documents are not self-describing and documents with a single digest could be interpreted as either a manifest or an index.

### Patches
The Image Specification will be updated to recommend that both manifest and index documents contain a `mediaType` field to identify the type of document.
Release [v1.0.2](https://github.com/opencontainers/image-spec/releases/tag/v1.0.2) includes these updates.

### Workarounds
Software attempting to deserialize an ambiguous document may reject the document if it contains both “manifests” and “layers” fields or “manifests” and “config” fields.

### References
https://github.com/opencontainers/distribution-spec/security/advisories/GHSA-mc8v-mgrf-8f4m

### For more information
If you have any questions or comments about this advisory:
* Open an issue in https://github.com/opencontainers/image-spec
* Email us at [security@opencontainers.org](mailto:security@opencontainers.org)
* https://github.com/opencontainers/image-spec/commits/v1.0.2


## Affected packages

- `github.com/opencontainers/image-spec < 1.0.2`

## Remediation

Upgrade to a patched release:

- `github.com/opencontainers/image-spec 1.0.2`