fix: patch CVE-2026-49451 (Microsoft.OpenApi stack overflow)#167
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An earlier fix for this CVE (Dependabot alert #8) was made on a long-lived feature branch and never merged to main, so the vulnerability stayed live in production; the advisory was since widened to a second range and Dependabot re-raised it as alert #9. Re-applies the same direct Microsoft.OpenApi 2.7.5 override on a branch off main so it actually ships. Vulnerable path (parsing untrusted OpenAPI documents) is unreachable in Quotinator, which only generates its own spec. Verified via tests and dotnet list package.
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Summary
Microsoft.OpenApifor a stack-overflow crash on circular schema references, transitively pulled in viaMicrosoft.AspNetCore.OpenApi 10.0.9.feature/data-import-sourcesbranch and never merged tomain— the vulnerability stayed live in production despite that branch's own CVE doc claiming "Closed". This PR re-applies the same fix directly againstmain.Microsoft.OpenApi 2.7.5PackageReference override inQuotinator.Api.csproj, forcing the patched version over the vulnerable transitive2.0.0.archived/, matching the project's "patch available same day" precedent),docs/security/README.md,Quotinator.slnx, and theunreleasedchangelog section (en/nl/de lockstep + regenerated markdown).Test plan
dotnet build --configuration Release— 0 warnings, 0 errorsdotnet test --configuration Release— 179/179 passingdotnet list package --include-transitiveconfirmsMicrosoft.OpenApiresolves to2.7.5🤖 Generated with Claude Code