Deserialization of untrusted data in NancyFX Framework Up to 2.0.0
Priority MEDIUM 48CWE-502Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and GitHub. Impact type from CWE-502.
Summary
Csrf.cs in NancyFX Nancy before 1.4.4 and 2.x before 2.0-dangermouse has Remote Code Execution via Deserialization of JSON data in a CSRF Cookie.
Why it matters now
EPSS 0.03012 87th percentileScored 2026-11-07
Fix Fixed Nancy (NuGet): 1.4.4, 2.0.0
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| NancyFX | NancyFX Framework Up to 2.0.0 | NancyFX Framework Up to 2.0.0 | — | No fix listed | CNA |
| — | Nancy (NuGet) | before 1.4.4 | 1.4.4 | Patch available | GHSA-mx3q-j2g2-5qxq |
| — | Nancy (NuGet) | 2.0.0-alpha to before 2.0.0 | 2.0.0 | Patch available | GHSA-mx3q-j2g2-5qxq |
- NancyFX Framework Up to 2.0.0 VendorNancyFX Affected NancyFX Framework Up to 2.0.0 Fixed in — No fix listed CNA
- Nancy (NuGet) Vendor— Affected before 1.4.4 Fixed in 1.4.4 Patch available GHSA-mx3q-j2g2-5qxq
- Nancy (NuGet) Vendor— Affected 2.0.0-alpha to before 2.0.0 Fixed in 2.0.0 Patch available GHSA-mx3q-j2g2-5qxq
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nancyfx:nancy:*:*:*:*:*:*:*:* | up to 1.4.3 | Vulnerable | NancyFX |
| cpe:2.3:a:nancyfx:nancy:2.0.0:alpha:*:*:*:*:*:* | 2.0.0 alpha | Vulnerable | NancyFX |
| cpe:2.3:a:nancyfx:nancy:2.0.0:barneyrubble:*:*:*:*:*:* | 2.0.0 barneyrubble | Vulnerable | NancyFX |
| cpe:2.3:a:nancyfx:nancy:2.0.0:clinteastwood:*:*:*:*:*:* | 2.0.0 clinteastwood | Vulnerable | NancyFX |
- cpe:2.3:a:nancyfx:nancy:*:*:*:*:*:*:*:* Versions up to 1.4.3 Vulnerable ·NancyFX
- cpe:2.3:a:nancyfx:nancy:2.0.0:alpha:*:*:*:*:*:* Versions 2.0.0 alpha Vulnerable ·NancyFX
- cpe:2.3:a:nancyfx:nancy:2.0.0:barneyrubble:*:*:*:*:*:* Versions 2.0.0 barneyrubble Vulnerable ·NancyFX
- cpe:2.3:a:nancyfx:nancy:2.0.0:clinteastwood:*:*:*:*:*:* Versions 2.0.0 clinteastwood Vulnerable ·NancyFX
Remediation
- Fix · GHSA-mx3q-j2g2-5qxq Nancy (NuGet) Fixed in 1.4.4 Advisory →
- Fix · GHSA-mx3q-j2g2-5qxq Nancy (NuGet) Fixed in 2.0.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2017-9785
- 2026-10-03 Alias added: GHSA-mx3q-j2g2-5qxq
References
Sources
- CVE-2017-9785 · CVE Program
- CVE-2017-9785 · NVD
- FIRST EPSS
- GHSA-mx3q-j2g2-5qxq · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences