CVE-2026-73074: Vim: Heap Buffer Overflow in Text Property Handling

Severity: medium (CVSS 6.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-11 · updated 2026-10-06
Weakness: CWE-190

Description

Vim is an open source, command line text editor. Prior to 9.2.0841, prop_add_one() in src/textprop.c uses the proplen value from get_text_props() to increment a uint16_t property count beyond 0xffff, wrapping the count to zero and copying existing text-property records into a heap allocation sized for none of them. This issue is fixed in version 9.2.0841.

Affected products

vim/vim: before 9.2.0841 — fixed in 9.2.0841

How to fix

Upgrade to a fixed version: vim/vim 9.2.0841. Check the vendor advisory for mitigations.

References

https://github.com/vim/vim/commit/a9336b476fd1a182e3f79b5f83c0ffb04f8a922b
https://github.com/vim/vim/security/advisories/GHSA-hm4g-pjfx-m27j

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