GO-2026-5048
- Source
- https://pkg.go.dev/vuln/GO-2026-5048
- Import Source
- https://vuln.go.dev/ID/GO-2026-5048.json
- JSON Data
- https://api.osv.dev/v1/vulns/GO-2026-5048
- Aliases
- Downstream
- Published
- 2026-07-27T16:16:22Z
- Modified
- 2026-07-27T17:00:19.792221728Z
- Summary
- Denial of service via unbounded map allocations in github.com/iskorotkov/avro/v2 and github.com/hamba/avro/v2
- Details
-
The Avro map decoder accepts attacker-controlled block-element counts from the wire format and grows the destination map without enforcing an upper bound. A producer can declare an arbitrarily large map (in one block, or chunked across many sub-limit blocks) and exhaust process memory until the OOM killer fires.
The fix introduces Config.MaxMapAllocSize with cumulative enforcement across block boundaries. The new limit is opt-in: the field defaults to zero, which preserves the previous unbounded behavior for backward compatibility. Upgrading to v2.33.0 alone does not mitigate the issue; consumers of untrusted Avro data must explicitly set MaxMapAllocSize on their avro.Config.
- Database specific
{ "review_status": "REVIEWED", "url": "https://pkg.go.dev/vuln/GO-2026-5048" }- References
- Credits
-
-
- Ivan Korotkov
-
- Daniel Błażewicz
-
Affected packages
Go / github.com/iskorotkov/avro/v2
Package
- Name
- github.com/iskorotkov/avro/v2
- View open source insights on deps.dev
- Purl
- pkg:golang/github.com/iskorotkov/avro/v2
Go / github.com/hamba/avro/v2
Package
- Name
- github.com/hamba/avro/v2
- View open source insights on deps.dev
- Purl
- pkg:golang/github.com/hamba/avro/v2