kin-openapi has uncontrolled resource consumption in openapi3filter deepObject query parameter decoding — GHSA-XHJ3-7XW9-VR34

Summary

### Summary An uncontrolled resource consumption vulnerability in `openapi3filter` lets any unauthenticated client force multi-gigabyte heap allocation with a single, tiny HTTP request. When a spec declares a `deepObject`-style query parameter whose schema contains an array (a normal, documented pattern), the decoder reconstructs the array by reading the **largest attacker-supplied index** and allocating one slot…

Timeline

Published by source

2026-08-21

Risk context

• Reported severity or threat level: high.
• Reported CVSS score: 8.7 out of 10.
• Review exposure for the affected product or family: go: github.com/getkin/kin-openapi.

Product

go: github.com/getkin/kin-openapi

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

Evidence and provenance

Canonical advisory ID

GHSA-XHJ3-7XW9-VR34

Source

GitHub

Vendor

GitHub

Published by source

2026-08-21

Last source activity

2026-08-21

Additional identifiers

CVE-2026-77354

Curated by

hlukh.ch

Related advisories and connections

These advisories are connected by shared CVE, product, vendor, source, or time signals.