{"items":[{"id":"NVI-00017615","kind":"vulnerability","title":"MessagePack-CSharp: JSON conversion APIs can recurse without consistent depth enforcement","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-cj9g-3mj2-g8vv","CVE-2026-48512"],"plain_summary":"GitHub lists this reviewed advisory for MessagePack, MessagePack. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-2efc89e96d6f227972df72e31a3bcdaf"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-2efc89e96d6f227972df72e31a3bcdaf","url":"https://github.com/advisories/GHSA-cj9g-3mj2-g8vv","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-cj9g-3mj2-g8vv","publisher":"GitHub Advisory Database","observed_at":"2026-11-05T19:05:53.922Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-2efc89e96d6f227972df72e31a3bcdaf"],"technology":"MessagePack","known_exclusions":[],"conditions_summary":"## Summary\n\nMessagePack-CSharp's JSON conversion helpers contain multiple recursion paths that do not consistently enforce a depth limit. These paths are in the JSON conversion component rather than normal typed MessagePack deserialization.\n\nThree related issues are covered by this advisory:\n\n1. `MessagePackSerializer.ConvertFromJson` recursively processes nested JSON arrays and objects in `FromJsonCore()` without consulting `MessagePackSecurity.MaximumObjectGraphDepth`.\n2. `TinyJsonReader.ReadNextToken()` recursively consumes comma and colon separator characters, allowing even malformed JSON with long separator runs to consume one stack frame per character.\n3. `MessagePackSerializer.ConvertToJson` applies depth checks to arrays and maps, but the typeless extension branch for ext-100 recursively calls `ToJsonCore()` without applying `MessagePackSecurity.DepthStep(ref reader)`.\n\nEach path can allow attacker-controlled input to exhaust the process stack and trigger an uncatchable `StackOverflowException` instead of failing with a catchable parse or serialization exception.\n\n## Impact\n\nApplications are affected when they call MessagePack-CSharp JSON conversion APIs on attacker-control","public_affected_ranges":["< 2.5.301"]},{"certainty":"source_listed","source_ids":["sr-2efc89e96d6f227972df72e31a3bcdaf"],"technology":"MessagePack","known_exclusions":[],"conditions_summary":"## Summary\n\nMessagePack-CSharp's JSON conversion helpers contain multiple recursion paths that do not consistently enforce a depth limit. These paths are in the JSON conversion component rather than normal typed MessagePack deserialization.\n\nThree related issues are covered by this advisory:\n\n1. `MessagePackSerializer.ConvertFromJson` recursively processes nested JSON arrays and objects in `FromJsonCore()` without consulting `MessagePackSecurity.MaximumObjectGraphDepth`.\n2. `TinyJsonReader.ReadNextToken()` recursively consumes comma and colon separator characters, allowing even malformed JSON with long separator runs to consume one stack frame per character.\n3. `MessagePackSerializer.ConvertToJson` applies depth checks to arrays and maps, but the typeless extension branch for ext-100 recursively calls `ToJsonCore()` without applying `MessagePackSecurity.DepthStep(ref reader)`.\n\nEach path can allow attacker-controlled input to exhaust the process stack and trigger an uncatchable `StackOverflowException` instead of failing with a catchable parse or serialization exception.\n\n## Impact\n\nApplications are affected when they call MessagePack-CSharp JSON conversion APIs on attacker-control","public_affected_ranges":[">= 3.0, < 3.1.7"]}],"null_published_at":"2026-11-05T19:10:21.426Z","source_updated_at":"2026-06-25T19:51:36.000Z","source_disclosed_at":"2026-06-25T19:51:36.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-05T19:05:53.922Z"}],"next_cursor":null,"snapshot_revision":"42594"}