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Vulnerability · Published Apr 18, 2026 · Assigned by GitHub_M

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

High 8.6

In plain English

A high-severity stack buffer overflow in editorconfig-core-c from editorconfig. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 4% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.6High
Exploit odds (30 days)0.2%top 95.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack tooling1Public PoC

Official 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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.24editorconfig0.12.11-r0ALPINE-CVE-2026-40489
Debian:12editorconfig-coreno fix listedDEBIAN-CVE-2026-40489
Debian:13editorconfig-coreno fix listedDEBIAN-CVE-2026-40489
Debian:14editorconfig-coreno fix listedDEBIAN-CVE-2026-40489
Ubuntu:24.04:LTSeditorconfig-core0.12.7-0.1ubuntu0.1UBUNTU-CVE-2026-40489
Ubuntu:25.10editorconfig-core0.12.9+~0.17.1-1ubuntu2.1UBUNTU-CVE-2026-40489
Ubuntu:26.04:LTSeditorconfig-core0.12.10+~0.17.1-3ubuntu0.1UBUNTU-CVE-2026-40489

Affected products (as reported)

VendorProductVersions
editorconfig editorconfig-core-c < 0.12.11

Weakness: CWE-121, CWE-787 · Vector: 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

References