CVE-2026-2656: A flaw has been found in ChaiScript up to 6.1.0

Q: How do I fix CVE-2026-2656?

chaiscript: upgrade to newer than 6.1.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-2656 being exploited?

CVE-2026-2656 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-2656 affect?

CVE-2026-2656 affects chaiscript. Severity is low (CVSS 2.5). A flaw has been found in ChaiScript up to 6.1.0. This affects the function chaiscript::Type_Info::bare_equal of the file include/chaiscript/dispatchkit/type_info.hpp. This manipulation causes use after free. The attack requires local access

Q: How urgent is CVE-2026-2656?

Priority 17/100. Public exploit reference

Routine

LOW 2.5UPGRADE

CVE-2026-2656 is a low-severity flaw (CVSS 2.5) affecting chaiscript. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw has been found in ChaiScript up to 6.1.0. This affects the function chaiscript::Type_Info::bare_equal of the file include/chaiscript/dispatchkit/type_info.hpp. This manipulation causes use after free. The attack requires local access. The attack's complexity is rated as high. The exploitability is reported as difficult. The exploit has been published and may be used. The project was informed of the problem early through an issue report but

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	2.5 (Low)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 88%)
CISA exploited list	No
Weakness	CWE-119, CWE-416
Published	2026-02-18
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: chaiscript

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-18 15:18 UTCPublished CVE record published
2026-06-17 10:31 UTCUpdated Record last modified

chaiscript chaiscript UPGRADE

Affected: <= 6.1.0

Fixed in: newer than 6.1.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy chaiscript || rpm -q chaiscript || chaiscript --version

2. UPGRADE to newer than 6.1.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade chaiscript

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade chaiscript

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-2656?

chaiscript: upgrade to newer than 6.1.0. Exact commands for each OS are on this page.

Is CVE-2026-2656 being exploited?

CVE-2026-2656 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-2656 affect?

CVE-2026-2656 affects chaiscript. Severity is low (CVSS 2.5). A flaw has been found in ChaiScript up to 6.1.0. This affects the function chaiscript::Type_Info::bare_equal of the file include/chaiscript/dispatchkit/type_info.hpp. This manipulation causes use after free. The attack requires local access

How urgent is CVE-2026-2656?

Priority 17/100. Public exploit reference

Related CVEs

CVE-2026-2655 LOW 2.5 UPGRADE A vulnerability was detected in ChaiScript up to 6.1.0

References

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