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CVE-2026-40489: editorconfig-core-c has incomplete fix for CVE-2023-0341

• Severity: high (CVSS 8.6 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-18 · updated 2026-10-26
• Weakness: CWE-121

Description

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-core-c: before 0.12.11

References

• https://github.com/editorconfig/editorconfig-core-c/commit/5159be88ad50641d9843289adda791ba300421ff
• https://github.com/editorconfig/editorconfig-core-c/releases/tag/v0.12.11
• https://github.com/editorconfig/editorconfig-core-c/security/advisories/GHSA-97xg-vrcq-254h

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