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Vulnerability record · CVE-2026-40489 · published 18 April 2026

CVE-2026-40489: Stack-based buffer overflow vulnerability

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.

8.6 CVSS 4.0 High EPSS 0.19% · top 92.0% CWE-121 · Stack-based buffer overflowCWE-787 · Out-of-bounds write Deferred
8.6CVSS 4.0 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-40489), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.