CVE-2026-45130Vim: Heap Buffer Overflow in spell file loading

Description

Vim is an open source, command line text editor. Prior to version 9.2.0450, a heap buffer overflow exists in read_compound() in src/spellfile.c when loading a crafted spell file (.spl) with UTF-8 encoding active. An attacker-controlled length field in the spell file's compound section overflows a 32-bit signed integer multiplication, causing a small buffer to be allocated for a write loop that runs many iterations, overflowing the heap. Because the 'spelllang' option can be set from a modeline, a text file modeline can trigger spell file loading if a malicious .spl file has been planted on the runtimepath. This issue has been patched in version 9.2.0450.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/vim/vim/security/advisories/GHSA-q4jv-r9gj-6cwv ExploitPatchVendor Advisory
• https://github.com/vim/vim/commit/92993329178cb1f72d700fff45ca86e1c2d369f8 Patch
• https://github.com/vim/vim/releases/tag/v9.2.0450 Product
• http://www.openwall.com/lists/oss-security/2026/05/14/3 Mailing ListThird Party Advisory