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Security Advisories: GSA_kwCzR0hTQS14MzlqLWg4NWgtM2Y0Ns4AAwNX

go-merkledag's ProtoNode may be modified such that common method calls may panic


A ProtoNode may be modified in such a way as to cause various encode errors which will trigger a panic on common method calls that don't allow for error returns.

A ProtoNode should only be able to encode to valid DAG-PB, attempting to encode invalid DAG-PB forms will result in an error from the codec. Manipulation of an existing (newly created or decoded) ProtoNode using the modifier methods did not account for certain states that would place the ProtoNode into an unencodeable form.

Due to conformance with the and interfaces, certain methods, which internally require a re-encode if state has changed, will panic due to the inability to return an error.

Additionally, use of the ProtoNode#SetCidBuilder() method to set a non-functioning CidBuilder (such as one that refers to a multihash where an implementation of that hash function is not available) may cause the same methods to panic as a new CID is required but cannot be created.


Releases involving fixes for this issue are v0.8.0 and v0.8.1. The recommended minimum version is v0.8.1.


These workarounds are available when using impacted versions to avoid panic conditions, and may be generally appropriate in order to provide meaningful feedback to users and avoid generating bad, or unexpected encoded data:



Thanks to @mrd0ll4r for reporting the original error to Kubo!

Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 1 year ago
Updated: about 1 year ago

CVSS Score: 7.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Identifiers: GHSA-x39j-h85h-3f46, CVE-2022-23495
References: Repository:
Blast Radius: 22.7

Affected Packages
Dependent packages: 1,065
Dependent repositories: 1,066
Affected Version Ranges: >= 0.4.0, < 0.8.1
Fixed in: 0.8.1
All affected versions: 0.4.0, 0.4.1, 0.5.0, 0.5.1, 0.6.0, 0.7.0, 0.8.0
All unaffected versions: 0.0.1, 0.0.2, 0.0.3, 0.0.4, 0.0.5, 0.0.6, 0.1.0, 0.2.0, 0.2.1, 0.2.2, 0.2.3, 0.2.4, 0.3.0, 0.3.1, 0.3.2, 0.8.1, 0.9.0, 0.10.0, 0.11.0