CVE-2026-2655Public exploit

Application crash via asynchronous teardown 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 through concurrent script execution. During engine teardown, detached async workers continue undefined-variable lookups in a shared symbol map after the main thread frees its nodes, so str_less reads a released string key. Exploitation requires local low-privileged access and a timing-dependent race; the demonstrated consequence is an availability-only crash.

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 through concurrent script execution. During engine teardown, detached async workers continue undefined-variable lookups in a shared symbol map after the main thread frees its nodes, so str_less reads a released string key. Exploitation requires local low-privileged access and a timing-dependent race; the demonstrated consequence is an availability-only crash.

The record

CVE
CVE-2026-2655
Published
Feb 18, 2026
Updated
Feb 18, 2026
Vendor
ChaiScript
Product
ChaiScript
Classifications
CWE-416, CWE-119
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

1.0VulDBAV: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
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

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

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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