CVE-2026-62866Public exploit

Process crash via trailing-whitespace selector

Published Sep 21, 2026 · Updated Sep 21, 2026

Improper array-index validation in Dasel 3.0.0 through 3.11.1 allows local users to crash the process with a trailing-whitespace selector. parseCurRune advances its index to the end of the selector while skipping whitespace, then reads the exhausted array position without a bounds check. The selector must reach the CLI or library query path; exploitation interrupts only that process and does not affect confidentiality or integrity.

CVSS severity6.2
Medium
EPSS probability0.19%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper array-index validation in Dasel 3.0.0 through 3.11.1 allows local users to crash the process with a trailing-whitespace selector. parseCurRune advances its index to the end of the selector while skipping whitespace, then reads the exhausted array position without a bounds check. The selector must reach the CLI or library query path; exploitation interrupts only that process and does not affect confidentiality or integrity.

The record

CVE
CVE-2026-62866
Published
Sep 21, 2026
Updated
Sep 21, 2026
Vendor
Tom Wright
Product
Dasel
Classifications
CWE-129, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 21, 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=< 3.11.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Tom Wright · Daselversion=< 3.11.2

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-129Improper Validation of Array Index
T1499Endpoint Denial of Service

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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