CVE-2026-2656Public exploit

Local application crash via type-map lifetime race

Published Feb 18, 2026 · Updated Feb 18, 2026

Use-after-free in ChaiScript 6.0 and 6.1.0 allows local users to crash a host application by racing asynchronous error handling. During engine destruction, the main thread frees the Dispatch_Engine type map while a worker formats eval_error and bare_equal reads a freed type node. Triggering the crash requires local access and a high-complexity timing race between asynchronous script execution and engine teardown.

CVSS severity2.5
Low
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in ChaiScript 6.0 and 6.1.0 allows local users to crash a host application by racing asynchronous error handling. During engine destruction, the main thread frees the Dispatch_Engine type map while a worker formats eval_error and bare_equal reads a freed type node. Triggering the crash requires local access and a high-complexity timing race between asynchronous script execution and engine teardown.

The record

CVE
CVE-2026-2656
Published
Feb 18, 2026
Updated
Feb 18, 2026
Vendor
ChaiScript
Product
ChaiScript
Classifications
CWE-416, CWE-119, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 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=6.0
  2. Affected versionversion=6.1.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

ChaiScript · ChaiScriptversion=6.0; version=6.1.0

Published CVSS scores

1.1VulDBCVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
1.0VulDBAV:L/AC:H/Au:S/C:N/I:N/A:P
2.5VulDBCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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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