How severe is CVE-2026-25749?

CVE-2026-25749 has a CVSS 3.x base score of 6.6, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-25749 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25749?

CVE-2026-25749 primarily affects Neovim. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-25749?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-25749 have an EU (EUVD) identifier?

Yes. CVE-2026-25749 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6930.

When was CVE-2026-25749 published?

CVE-2026-25749 was published on 2026-02-06 and last updated on 2026-06-17.

CVE-2026-25749

CVE-2026-25749 is a medium-severity vulnerability in Neovim with a CVSS 3.x base score of 6.6. 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-122.

Key facts

Severity: Medium (CVSS 3.x base score 6.6)
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-6930
Weakness: CWE-122
Affected product: Neovim
Published: 2026-02-06
Last modified: 2026-06-17

Description

Vim is an open source, command line text editor. Prior to version 9.1.2132, a heap buffer overflow vulnerability exists in Vim's tag file resolution logic when processing the 'helpfile' option. The vulnerability is located in the get_tagfname() function in src/tag.c. When processing help file tags, Vim copies the user-controlled 'helpfile' option value into a fixed-size heap buffer of MAXPATHL + 1 bytes (typically 4097 bytes) using an unsafe STRCPY() operation without any bounds checking. This issue has been patched in version 9.1.2132.

Frequently asked questions

What is CVE-2026-25749?: Vim is an open source, command line text editor. Prior to version 9.1.2132, a heap buffer overflow vulnerability exists in Vim's tag file resolution logic when processing the 'helpfile' option. The vulnerability is located in the get_tagfname() function in src/tag.c. When processing help file tags, Vim copies the user-controlled 'helpfile' option value into a fixed-size heap buffer of MAXPATHL + 1 bytes (typically 4097 bytes) using an unsafe STRCPY() operation without any bounds checking. This issue has been patched in version 9.1.2132.
How severe is CVE-2026-25749?: CVE-2026-25749 has a CVSS 3.x base score of 6.6, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-25749 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25749?: CVE-2026-25749 primarily affects Neovim. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-25749?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-25749 have an EU (EUVD) identifier?: Yes. CVE-2026-25749 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6930.
When was CVE-2026-25749 published?: CVE-2026-25749 was published on 2026-02-06 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:neovim:neovim:*:*:*:*:*:*:*:*
cpe:2.3:a:vim:vim:*:*:*:*:*:*:*:*

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