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Fencer Vulns
high 8.6

CVE-2026-40489 json

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

published 2026-04-18 6 mo ago modified 2026-10-26 13 d ago also EUVD-2026-23636

cvss
8.6
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

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.

Patch / fix

  • editorconfig-core Ubuntu 24.04 LTS 0.12.7-0.1ubuntu0.1
  • editorconfig-core Ubuntu 25.10 0.12.9+~0.17.1-1ubuntu2.1
  • editorconfig-core Ubuntu 26.04 LTS 0.12.10+~0.17.1-3ubuntu0.1
  • editorconfig-core Ubuntu Pro 16.04 LTS 0.12.0-2ubuntu0.1~esm3
  • editorconfig-core Ubuntu Pro 18.04 LTS 0.12.1-1.1ubuntu0.18.04.1~esm3
  • editorconfig-core Ubuntu Pro 20.04 LTS 0.12.1-1.1+deb11u1ubuntu0.1~esm1
  • editorconfig-core Ubuntu Pro 22.04 LTS 0.12.5-2ubuntu0.1~esm3

ubuntu advisories UBUNTU-CVE-2026-40489

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • editorconfig-core-c SLE Module for Development Tools 15 SP7 0.12.6-150600.3.6.1
  • editorconfig-core-c SLES for SAP applications 16.0, SLES 16.0 0.12.9-160000.3.1

suse advisories SUSE-SU-2026:2731-1SUSE-SU-2026:22125-1

  • editorconfig-core-c openSUSE Leap 16.0 0.12.9-160000.3.1
  • editorconfig-core-c openSUSE Tumbleweed 0.12.11-1.1

opensuse advisories openSUSE-SU-2026:20966-1openSUSE-SU-2026:10663-1

  • editorconfig Alpine 3.24 0.12.11-r0

alpine advisories ALPINE-CVE-2026-40489

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
6 mo ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 8.6 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
CNA 4.0 8.6 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:X/V:X/RE:X/U:X

Affected products

  • editorconfig editorconfig-core-c

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.