CVE-2026-2655: A vulnerability was detected in ChaiScript up to 6.1.0

Q: How do I fix CVE-2026-2655?

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

Q: Is CVE-2026-2655 being exploited?

CVE-2026-2655 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-2026-2655 affect?

CVE-2026-2655 affects chaiscript. Severity is low (CVSS 2.5). A vulnerability was detected in ChaiScript up to 6.1.0. The impacted element is the function chaiscript::str_less::operator of the file include/chaiscript/chaiscript_defines.hpp. The manipulation results in use after free. The attack requir

Q: How urgent is CVE-2026-2655?

Priority 17/100. Public exploit reference

Routine

LOW 2.5UPGRADE

CVE-2026-2655 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 vulnerability was detected in ChaiScript up to 6.1.0. The impacted element is the function chaiscript::str_less::operator of the file include/chaiscript/chaiscript_defines.hpp. The manipulation results in use after free. The attack requires a local approach. The attack requires a high level of complexity. The exploitability is regarded as difficult. The exploit is now public and may be used. The project was informed of the problem early through

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 14:16 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-2026-2655?

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

Is CVE-2026-2655 being exploited?

CVE-2026-2655 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-2026-2655 affect?

CVE-2026-2655 affects chaiscript. Severity is low (CVSS 2.5). A vulnerability was detected in ChaiScript up to 6.1.0. The impacted element is the function chaiscript::str_less::operator of the file include/chaiscript/chaiscript_defines.hpp. The manipulation results in use after free. The attack requir

How urgent is CVE-2026-2655?

Priority 17/100. Public exploit reference

Related CVEs

CVE-2026-2656 LOW 2.5 UPGRADE A flaw has been found in ChaiScript up to 6.1.0

References

← Back to latest CVEs