Vim: Heap Buffer Overflow in spell file loading_CVE-2026-45130

6.6 / 10

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

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.

Basic Information

ID CVE-2026-45130

Source GitHub_M

Published May 8, 2026 at 22:42

Affected Product

Vendor vim

Product vim

Version < 9.2.0450

Affected Versions vim vim < 9.2.0450

CWE Classification

CWE-122 CWE-190

References

{
    "lastseen": "",
    "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.",
    "published": "2026-05-08T22:42:35.097Z",
    "modified": "2026-05-08T22:42:35.097Z",
    "type": "cve",
    "title": "Vim: Heap Buffer Overflow in spell file loading",
    "source": "GitHub_M",
    "references": "https://github.com/vim/vim/security/advisories/GHSA-q4jv-r9gj-6cwv\nhttps://github.com/vim/vim/commit/92993329178cb1f72d700fff45ca86e1c2d369f8\nhttps://github.com/vim/vim/releases/tag/v9.2.0450",
    "id": "CVE-2026-45130",
    "bulletinFamily": "",
    "cwe": [
        "CWE-122",
        "CWE-190"
    ],
    "cvelist": null,
    "sourceData": "vim vim < 9.2.0450",
    "sourceHref": "",
    "cvss": {
        "score": 6.6,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "vim",
    "version": "< 9.2.0450",
    "vendor": "vim",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}