CVE-2026-40489: Editorconfig Editorconfig-Core-C

High severity, CVSS 8.6. EPSS: 0.2% chance of exploitation in the next 30 days.

editorconfig-core-c is an EditorConfig core library for use by plugins supporting EditorConfig parsing. Versions up to and including 0.12.10 have a stack-based buffer overflow in ec_glob() that allows an attacker to crash any application using libeditorconfig by providing a specially crafted directory structure and .editorconfig file. This is an incomplete fix for CVE-2023-0341. The pcre_str buffer was protected in 0.12.6 but the adjacent l_pattern[8194] stack buffer received no equivalent protection. On Ubuntu 24.04, FORTIFY_SOURCE converts the overflow to SIGABRT (DoS). Version 0.12.11 contains an updated fix.

Affected products

• Editorconfig Editorconfig-Core-C: before 0.12.11 (fixed in 0.12.11)

Published 2026-04-18. Last modified 2026-06-17.