# GO-2026-5048 - Denial of service via unbounded map allocations in github.com/iskorotkov/avro/v2 and github.com/hamba/avro/v2

Source: https://junglewise.ai/threats/go-2026-5048-denial-of-service-via-unbounded-map-allocations-in-github-046da6cd  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-27  
License: CC BY 4.0 with a link back

Severity: info · Published 2026-07-27

Denial of service via unbounded map allocations in github.com/iskorotkov/avro/v2 and github.com/hamba/avro/v2

Technologies: [github.com/hamba/avro/v2 (Go)](https://junglewise.ai/threats/technologies/github-com-hamba-avro-v2), [github.com/iskorotkov/avro/v2 (Go)](https://junglewise.ai/threats/technologies/github-com-iskorotkov-avro-v2). Vendors: [Go](https://junglewise.ai/threats/vendors/go).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Informational severity, published 27 July 2026.

**Which products and versions are affected?** github.com/hamba/avro/v2 (Go) SEMVER:introduced=0; github.com/iskorotkov/avro/v2 (Go) SEMVER:introduced=0,fixed=2.33.0.

**Is there a fix for This vulnerability?** Yes. github.com/iskorotkov/avro/v2 (Go): upgrade to 2.33.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected?** Check whether you run github.com/hamba/avro/v2 (Go) or github.com/iskorotkov/avro/v2 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/iskorotkov/avro/v2 (Go): upgrade to 2.33.0 or later

  ```sh
  go get github.com/iskorotkov/avro/v2@v2.33.0
  ```


## Affected products

- github.com/hamba/avro/v2 (Go) SEMVER:introduced=0
- github.com/iskorotkov/avro/v2 (Go) SEMVER:introduced=0,fixed=2.33.0

## Related threats

- [iskorotkov/avro CPU exhaustion in array and map decoders](https://junglewise.ai/threats/cve-2026-46385-iskorotkov-avro-cpu-exhaustion-in-array-and-map-decoders)
- [iskorotkov avro integer overflow and narrowing in decoder](https://junglewise.ai/threats/cve-2026-46384-iskorotkov-avro-integer-overflow-and-narrowing-in-decoder)
- [iskorotkov/avro memory exhaustion in map decoder](https://junglewise.ai/threats/iskorotkov-avro-memory-exhaustion-in-map-decoder-7795edd3)
- [GO-2023-1930 - Unrestricted memory consumption in github.com/hamba/avro](https://junglewise.ai/threats/cve-2023-37475-avro-vulnerable-to-denial-of-service-via-attacker-controlled)