CVE-2026-42199Public exploit

Safe-API undefined behavior via unchecked dimension arithmetic

Published May 8, 2026 · Updated May 8, 2026

Integer overflow in the grid crate 0.17.0 through 1.0.0 allows local users to trigger undefined behavior through oversized dimensions. Grid::expand_rows multiplies and adds usize dimensions without checked arithmetic, then updates logical row metadata after the backing-vector length wraps. Exploitation requires a consuming application to pass attacker-controlled growth values; invalid get_unchecked access can crash that process.

CVSS severity6.2
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in the grid crate 0.17.0 through 1.0.0 allows local users to trigger undefined behavior through oversized dimensions. Grid::expand_rows multiplies and adds usize dimensions without checked arithmetic, then updates logical row metadata after the backing-vector length wraps. Exploitation requires a consuming application to pass attacker-controlled growth values; invalid get_unchecked access can crash that process.

The record

CVE
CVE-2026-42199
Published
May 8, 2026
Updated
May 8, 2026
Vendor
Armin Becher
Product
grid
Classifications
CWE-190, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 0.17.0, < 1.0.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Armin Becher · gridversion=>= 0.17.0, < 1.0.1

Published CVSS scores

6.2GitHubCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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