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.NET
.NET NuGet
Not in CISA KEV
HIGH severity

CVE-2020-1469 — Bond.Core.CSharp

HIGHFix: microsoft/bond@3afea82

CVE-2020-1469 is a high-severity (CVSS 7.5) Unrestricted File Upload vulnerability in Bond.Core.CSharp. A fix is available for Bond.Core.CSharp — see the affected versions and patch details below.

Infinite loop in .Net Bond

Also known asGHSA-rqrc-8q8f-cp9c
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 29, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
4.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs92th percentile — riskier than 92% of all scored CVEsHighest risk
4.34%5.12%5.91%6.69%6.2%4.8%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
.NETBond.Core.CSharp

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

A denial of service vulnerability exists when the .NET implementation of Bond improperly parses input, aka 'Bond Denial of Service Vulnerability'. Handling of large container lengths that could cause an infinite loop when deserializing some payloads.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
.NETNuGetBond.Core.CSharp≥ 3.0.0&&< 9.0.19.0.1dotnet add package Bond.Core.CSharp --version 9.0.1

Affected Products

1 product · 1 configurations
Application
bondmicrosoft
1 version
9.0.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

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

  2. Fix

    Update Bond.Core.CSharp to 9.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-1469 is resolved across your whole dependency graph.

  3. Workarounds

    Treat uploaded files as untrusted until proven otherwise: validate the actual content type rather than the supplied extension, store uploads outside the web root on a volume mounted without execute permission, and rename them to server-generated identifiers so an attacker cannot choose the path a request will later resolve.

Frequently Asked Questions

A denial of service vulnerability exists when the .NET implementation of Bond improperly parses input, aka 'Bond Denial of Service Vulnerability'. Handling of large container lengths that could cause an infinite loop when deserializing some payloads.
O3 Security · Impact-Aware SCA

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CVE-2020-1469: Bond.Core.CSharp DoS — Fixed in 9.0.1