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Advisory record · GHSA-8ffr-xgwf-xj56

aws-smithy-json: Uncontrolled recursion in the aws-smithy-json unknown-key skip path allows unauthenticated remote denial of service in smithy-rs generated servers

CVSS 8.7 HighEPSS 0.0078 · 56th percentile

Published by the GitHub Advisory Database at 2 Oct 2026, 22:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
aws-smithy-jsoncrates.io<0.62.70.62.7
Identifiers
GHSA-8ffr-xgwf-xj56 · CVE-2026-18140
Weakness (CWE)
CWE-674
Tags
Published
2 Oct 2026
Updated
2 Oct 2026

Machine-written summary

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

The aws-smithy-json crate, versions before 0.62.7, has uncontrolled recursion in its unknown-key skip path. An unauthenticated remote attacker can send a single small HTTP request containing deeply nested JSON to a server generated by smithy-rs, causing stack exhaustion and a process abort. Upgrade aws-smithy-json to version 0.62.7 or later. No workarounds are listed.

Written 3 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 (AMZN)
  • CISA KEV Not listed.
  • EPSS 0.0078, the 56th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:24 UTC First seen by agentprime
  2. 31 Oct 2026, 14:24 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.