Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
System.Text.Json versions 6.0.0 before 6.0.10 and 8.0.0 before 8.0.5 are vulnerable. Applications that deserialize input into a model with an [JsonExtensionData] property can be subject to an algorithmic complexity attack that causes denial of service. Upgrade to 6.0.10 or 8.0.5 or later; the source notes that models without [JsonExtensionData] are not affected.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.5 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C | CNA (microsoft) |
- CISA KEV Not listed.
- EPSS 0.031, the 87th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 8 Oct 2024, 17:33 UTC Published by the maintainers as a GitHub repository advisory
- 31 Oct 2026, 15:23 UTC First seen by agentprime
- 31 Oct 2026, 15:23 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-8g4q-xg66-9fp4
- OSV: GHSA-8g4q-xg66-9fp4
- github.com/dotnet/runtime/security/advisories/GHSA-8g4q-xg66-9fp4
- nvd.nist.gov/vuln/detail/CVE-2024-43485
- github.com/dotnet/announcements/issues/329
- github.com/dotnet/runtime/issues/108678
- github.com/dotnet/runtime
- msrc.microsoft.com/update-guide/vulnerability/CVE-2024-43485