GHSA-4qm4-8hg2-g2xm
Suggest an improvement- Source
- https://github.com/advisories/GHSA-4qm4-8hg2-g2xm
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/10/GHSA-4qm4-8hg2-g2xm/GHSA-4qm4-8hg2-g2xm.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-4qm4-8hg2-g2xm
- Aliases
- Downstream
- Published
- 2024-10-17T19:30:03Z
- Modified
- 2026-09-10T03:50:20Z
- Summary
- MessagePack allows untrusted data to lead to DoS attack due to hash collisions and stack overflow
- Details
-
Impact
When this library is used to deserialize messagepack data from an untrusted source, there is a risk of a denial of service attack by an attacker that sends data contrived to produce hash collisions, leading to large CPU consumption disproportionate to the size of the data being deserialized.
This is similar to a prior advisory, which provided an inadequate fix for the hash collision part of the vulnerability.
Patches
The following steps are required to mitigate this risk.
- Upgrade to a version of the library where a fix is available. If upgrading from v1, check out our migration guide.
- Review the steps in this previous advisory to ensure you have your application configured for untrusted data.
Workarounds
If upgrading MessagePack to a patched version is not an option for you, you may apply a manual workaround as follows:
- Declare a class that derives from
MessagePackSecurity. - Override the
GetHashCollisionResistantEqualityComparer<T>method to provide a collision-resistant hash function of your own and avoid callingbase.GetHashCollisionResistantEqualityComparer<T>(). - Configure a
MessagePackSerializerOptionswith an instance of your derived type by callingWithSecurityon an existing options object. - Use your custom options object for all deserialization operations. This may be by setting the
MessagePackSerializer.DefaultOptionsstatic property, if you call methods that rely on this default property, and/or by passing in the options object explicitly to anyDeserializemethod.
References
- Learn more about best security practices when reading untrusted data with MessagePack 1.x or MessagePack 2.x.
- The .NET team's discussion on hash collision vulnerabilities of their
HashCodestruct (or in the pull request that merges this into the dotnet org).
For more information
If you have any questions or comments about this advisory:
- Database specific
{ "cwe_ids": [ "CWE-328" ], "github_reviewed": true, "github_reviewed_at": "2024-10-17T19:30:03Z", "nvd_published_at": "2024-10-17T21:15:14Z", "severity": "MODERATE" }- References
Affected packages
NuGet / MessagePack
Package
- Name
- MessagePack
- View open source insights on deps.dev
- Purl
- pkg:nuget/MessagePack
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed2.5.187
Affected versions
0.*
0.1.0-beta
0.2.0-beta
0.2.1-beta
0.2.2-beta
0.2.3-beta
0.3.0-beta
0.4.0
0.4.1
0.4.2
0.5.0
0.6.0
0.6.1
0.7.0
0.7.2
0.8.0
0.8.1
0.8.2
0.8.3
0.8.4
0.8.5
1.*
1.0.0
1.0.1
1.0.2
1.0.3
1.1.0
1.1.1
1.1.1.1
1.1.2
1.2.0
1.2.0.1
1.2.0.2
1.2.1
1.2.2
1.2.3
1.3.0
1.3.1
1.3.1.1
1.3.2
1.3.3
1.4.0
1.4.1
1.4.2
1.4.3
1.4.4
1.5.0
1.5.0.1
1.5.0.2
1.5.1
1.6.0
1.6.0.1
1.6.0.2
1.6.0.3
1.6.1
1.6.1.1
1.6.1.2
1.6.2
1.7.0
1.7.1
1.7.2
1.7.3
1.7.3.1
1.7.3.2
1.7.3.3
1.7.3.4
1.7.3.7
1.8.71-beta
1.8.74
1.8.80
1.9.3-g129239b107
1.9.3
1.9.11
2.*
2.0.107-alpha
2.0.108-alpha
2.0.110-alpha
2.0.110-alpha-g1e44a9106f
2.0.119-beta
2.0.123-beta
2.0.171-beta
2.0.204-beta
2.0.221-beta
2.0.231-rc
2.0.270-rc
2.0.299-rc
2.0.323
2.0.335
2.1.80
2.1.90
2.1.115
2.1.143
2.1.152
2.1.165
2.1.194
2.2.36-alpha
2.2.44-rc
2.2.60
2.2.85
2.2.113
2.3.58-alpha
2.3.73-alpha
2.3.75
2.3.85
2.3.112
2.4.14-alpha
2.4.23-alpha
2.4.35
2.4.59
2.5.64-alpha
2.5.94
2.5.103
2.5.108
2.5.124
2.5.129
2.5.140
2.5.168
2.5.171
2.5.172
NuGet / MessagePack
Package
- Name
- MessagePack
- View open source insights on deps.dev
- Purl
- pkg:nuget/MessagePack