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Advisory record · GHSA-7632-4q2x-hvjw

Stack overflow when parsing deeply nested input in pest_grammars

CVSS 3.3 Low

Published by the GitHub Advisory Database at 16 Oct 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
pest_grammarscrates.io>=0.0.0-0, <2.9.32.9.3
Identifiers
GHSA-7632-4q2x-hvjw · RUSTSEC-2026-0366
Published
16 Oct 2026
Updated
16 Oct 2026

Machine-written summary

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

Stack exhaustion in pest_grammars before 2.9.3 can occur when the JsonParser parses deeply nested JSON, aborting the host process. An attacker who can supply JSON to an application that uses this parser without adequate resource limits can cause a denial of service. Upgrade to pest_grammars 2.9.3 or later, which also requires the updated pest runtime; applications that cannot upgrade should reject excessively nested input before parsing or set a conservative pest::set_call_limit() budget.

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
3.3 Low 3.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L OSV
  • CISA KEV Not listed.
  • EPSS No score.

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.