CVE-2026-32285: buger jsonparser denial of service via negative slice index panic

CVE-2026-32285 · Severity: high · CVSS 7.5 · Published 2026-03-26

A vulnerability in a widely used Go library for processing JSON data can allow an attacker to crash applications that use it. By sending a specially crafted, malformed JSON payload, an attacker can trigger a system error that shuts down the service, leading to a denial of service. This affects several Red Hat cloud management products that incorporate the vulnerable library.

Technologies: github.com/buger/jsonparser (Go), Red Hat Multicluster Global Hub. Vendors: Go, Red Hat.

Quick answers

Is CVE-2026-32285 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-32285 being exploited in the wild.
How severe is CVE-2026-32285?
High severity, with a CVSS score of 7.5, published 26 March 2026.
Which products and versions are affected?
github.com/buger/jsonparser (Go) <= 1.1.1, SEMVER:introduced=0,fixed=1.1.2; Red Hat Multicluster Global Hub 1.3.4, 1.4.5, 1.5.4, 1.6.2.
Is there a fix for CVE-2026-32285?
Yes. github.com/buger/jsonparser (Go): upgrade to 1.1.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-32285 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-32285?
Check whether you run github.com/buger/jsonparser (Go), Jsonparser Project Jsonparser or Red Hat Multicluster Global Hub 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/buger/jsonparser (Go): upgrade to 1.1.2 or later
    go get github.com/buger/jsonparser@v1.1.2

Technical details

A denial of service vulnerability exists in the github.com/buger/jsonparser library due to improper validation of array indexes (CWE-129/CWE-1285). The Delete() function in parser.go computes an offset that can become negative when processing malformed JSON input. Because this negative value is used as a slice index without a lower-bound check, it triggers a Go runtime panic ("slice bounds out of range [-1:]"). An unauthenticated remote attacker can exploit this by providing a malformed JSON payload to any service that calls Delete() on untrusted input. This issue is distinct from the infinite loop bug addressed in CVE-2020-10675. The vulnerability is fixed in version 1.1.2.

Affected products

  • buger jsonparser before v1.1.2
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2.15
  • Red Hat Multicluster Global Hub 1.3.4, 1.4.5, 1.5.4, 1.6.2
  • Red Hat multicluster engine for Kubernetes 2.8, 2.10

Identifiers

  • CVE-2026-32285
  • GHSA-6g7g-w4f8-9c9x
  • GO-2026-4514

Timeline

  • 2026-02-19: disclosed: Issue reported on GitHub and Go vulnerability database
  • 2026-03-16: advisory: Go vulnerability report GO-2026-4514 published
  • 2026-03-26: advisory: CVE-2026-32285 published to NVD
  • 2026-05-04: patched: Red Hat released security updates for Advanced Cluster Management

References

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