# CVE-2026-42328: go-ipld-prime: DAG-CBOR and DAG-JSON decoders unbounded recursion depth

> Attackers can cause a denial of service by sending deeply nested data to the go-ipld-prime decoders, crashing the application via stack overflow.

- **Severity:** Medium 6.2 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 27 May 2026
- **Updated:** 28 May 2026
- **Also known as:** GHSA-w239-58x2-q8p5, GO-2026-5684, MINI-456h-qq37-p46f, MINI-xmh3-45pm-pfwf

## What is CVE-2026-42328?

CVE-2026-42328 is a medium-severity denial of service vulnerability in go-ipld-prime, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

go-ipld-prime is an implementation of the InterPlanetary Linked Data (IPLD) spec interfaces, a batteries-included codec implementations of IPLD for CBOR and JSON, and tooling for basic operations on IPLD objects. Prior to 0.23.0, the DAG-CBOR and DAG-JSON decoders recurse on each nested map or list without a depth limit. A payload containing deeply nested collections causes the decoder to recurse once per level, growing the goroutine stack until the Go runtime terminates the process with a fatal stack overflow (distinct from a recoverable panic). This vulnerability is fixed in 0.23.0.

Weakness: CWE-674 (Uncontrolled Recursion)

## Which versions are affected by CVE-2026-42328?

3 open source packages ship an affected version, including github.com/ipld/go-ipld-prime.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/ipld/go-ipld-prime` | Go | All versions | 0.23.0 |
| `github.com/ipld/go-ipld-prime` | Go | All versions | 0.23.0 |
| `github.com/ipld/go-ipld-prime` | Go | All versions | 0.23.0 |

## How do I fix CVE-2026-42328?

Upgrade github.com/ipld/go-ipld-prime to 0.23.0 or later.

## Is CVE-2026-42328 being exploited?

There is no known exploitation of CVE-2026-42328 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-42328 and fix it if it is affected.

What it is: CVE-2026-42328 is a medium-severity denial of service vulnerability in go-ipld-prime, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-42328 in the wild and no public exploit code.

Affected packages and fixed versions:
- github.com/ipld/go-ipld-prime (Go): affected all versions; fixed in 0.23.0
- github.com/ipld/go-ipld-prime (Go): affected all versions; fixed in 0.23.0
- github.com/ipld/go-ipld-prime (Go): affected all versions; fixed in 0.23.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-42328/ (Markdown: https://insights.sbomify.com/CVE-2026-42328/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-42328
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42328
- OSV: https://osv.dev/vulnerability/CVE-2026-42328

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-42328/
Summaries are generated and may contain mistakes; the official description above is the record.