PT-2026-20457 · Unknown · Chaiscript

Oneafter · CVE-2026-2656 · Published 2026-02-18 · Updated 2026-02-19

Positive Technologies (AI Summary)

CVSS v3.1

2.5

Low

Base vector

AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions ChaiScript versions up to 6.1.0

Description A flaw exists in ChaiScript that involves a use-after-free condition. This issue is related to the chaiscript::Type Info::bare equal function within the include/chaiscript/dispatchkit/type info.hpp file. The issue requires local access and is considered difficult to exploit. An exploit for this issue has been published.

Recommendations Update ChaiScript to a version newer than 6.1.0.

Exploit

Fix

Use After Free

Buffer Overflow

Weakness Enumeration

CWE-416

CWE-119

Related Identifiers

CVE-2026-2656

Affected Products

Chaiscript

References · 13

• 🔥 https://github.com/ChaiScript/ChaiScript/issues/636#issue-3828333582 · Exploit
• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/2xxx/CVE-2026-2656.json · Exploit
• https://github.com/ChaiScript/ChaiScript/issues/636 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-2656 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2656 · Security Note
• https://github.com/ChaiScript/ChaiScript · Note
• https://twitter.com/VulmonFeeds/status/2024223046781866183 · Twitter Post
• https://t.me/CVEtracker/44993 · Telegram Post
• https://vuldb.com/?submit.752790 · Note
• https://twitter.com/CVEnew/status/2024138057553989823 · Twitter Post
• https://vuldb.com/?ctiid.346454 · Note
• https://t.me/cveNotify/152480 · Telegram Post
• https://vuldb.com/?id.346454 · Note