How severe is CVE-2026-40489?

CVE-2026-40489 has a CVSS 4.0 base score of 8.6, rated high severity.

Is CVE-2026-40489 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40489?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-40489 have an EU (EUVD) identifier?

Yes. CVE-2026-40489 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23636.

When was CVE-2026-40489 published?

CVE-2026-40489 was published on 2026-04-18 and last updated on 2026-06-17.

CVE-2026-40489

CVE-2026-40489 is a high-severity vulnerability with a CVSS 4.0 base score of 8.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-121.

Key facts

Severity: High (CVSS 4.0 base score 8.6)
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23636
Weakness: CWE-121
Published: 2026-04-18
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-40489?: 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.
How severe is CVE-2026-40489?: CVE-2026-40489 has a CVSS 4.0 base score of 8.6, rated high severity.
Is CVE-2026-40489 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-40489?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40489 have an EU (EUVD) identifier?: Yes. CVE-2026-40489 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23636.
When was CVE-2026-40489 published?: CVE-2026-40489 was published on 2026-04-18 and last updated on 2026-06-17.

References

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