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.NET
.NET NuGet
Not in CISA KEV
HIGH severity

Mimekit has vulnerable dependency that can lead to denial of serviceGHSA-gmc6-fwg3-75m5

HIGHFix: jstedfast/MimeKit@aef4eda

GHSA-gmc6-fwg3-75m5 is a high-severity (CVSS 7.5) vulnerability in MimeKit. A fix is available for MimeKit — see the affected versions and patch details below.

Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 29, 2024 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
.NETMimeKit

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects NuGet packages — download data is not available via public APIs for these ecosystems.

Description

Summary

Denial of service vulnerability.

Details

See: https://github.com/advisories/GHSA-447r-wph3-92pm and https://github.com/dotnet/announcements/issues/312

PoC

Update System.Security.Cryptography.Pkcs to 8.0.1 so that the transitive dependency with the issue gets updated

Impact

Denial of service vulnerability. Affects MimeKit (>= v3.0.0 and <= v4.7.0) when used to decrypt or verify incoming S/MIME messages as well as importing 3rd-party X.509 certificates for use with encrypting outgoing S/MIME messages.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetMimeKit≥ 3.0.0&&< 4.7.14.7.1dotnet add package MimeKit --version 4.7.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for MimeKit, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update MimeKit to 4.7.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-gmc6-fwg3-75m5 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

### Summary Denial of service vulnerability. ### Details See: https://github.com/advisories/GHSA-447r-wph3-92pm and https://github.com/dotnet/announcements/issues/312 ### PoC Update System.Security.Cryptography.Pkcs to 8.0.1 so that the transitive dependency with the issue gets updated ### Impact Denial of service vulnerability. Affects MimeKit (>= v3.0.0 and <= v4.7.0) when used to decrypt or verify incoming S/MIME messages as well as importing 3rd-party X.509 certificates for use with encrypting outgoing S/MIME messages.
O3 Security · Impact-Aware SCA

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Mimekit has vulnerable dependency that can lead to…