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Advisory record · GHSA-xhj3-7xw9-vr34

kin-openapi has uncontrolled resource consumption in openapi3filter deepObject query parameter decoding

CVSS 8.7 HighEPSS 0.0052 · 45th percentile

Published by the GitHub Advisory Database at 21 Aug 2026, 20:56 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/getkin/kin-openapiGo>=0.124.0, <0.142.00.142.0
Identifiers
GHSA-xhj3-7xw9-vr34 · CVE-2026-77354 · GO-2026-6275
Weakness (CWE)
CWE-400 · CWE-789
Tags
Published
21 Aug 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

kin-openapi versions from 0.124.0 before 0.142.0 are affected. An unauthenticated remote client can send a small HTTP request with a crafted deepObject query parameter to an application that validates requests with openapi3filter, causing gigabytes of memory allocation and possible out-of-memory crashes. Upgrade to version 0.142.0. No fix is needed beyond that upgrade.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.7 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0052, the 45th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:13 UTC First seen by agentprime
  2. 31 Oct 2026, 14:13 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.