Out-of-Bounds Write in Vim (CVE-2026-57455)
Summary
Out-of-bounds write in Vim (CVE-2026-57455). Successful exploitation can lead to full system takeover. Mitigation: upgrade to 9.2.0698 or later.
Original description
The description as published by the source.
Vim is an open source, command line text editor. Prior to 9.2.0698, the single-byte branch of spell_soundfold_sofo() in src/spell.c translates a word through a spell file's SOFO (sound-folding) byte map into a caller-owned result buffer. Its copy loop advances the output index ri with no upper bound and terminates only on the input NUL, writing one byte per input byte into the MAXWLEN-element stack buffer the caller provides. A word longer than MAXWLEN, passed to soundfold() (or reached via sound-based spell suggestion) while a SOFO-based spell language is active, therefore writes past the end of that buffer. This is a stack out-of-bounds write that corrupts the call frame and crashes the editor. This vulnerability is fixed in 9.2.0698.
Source: NIST National Vulnerability Database NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-57455 has been found in Vim.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: upgrade Vim to 9.2.0698 or later.
If unsure, ask your IT team or search "Vim CVE-2026-57455" on the vendor's site.
CVE-2026-57455 (Vim) — CWE-787 / CVSS v3 7.8
Attack vector: local / unauthenticated
Patched: 9.2.0698 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Out-of-bounds write (CWE-787) exists in Vim.
Check the vendor advisory for the affected versions of Vim.
Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover.
Update to 9.2.0698.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Vim' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'Vim' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
Vimを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade Vim to 9.2.0698ステージング環境で 9.2.0698 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
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3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- BellSoft Alpaquita BELL-CVE-2026-57455 vim Fixed in: 9.2.0747-r0
- Ubuntu UBUNTU-CVE-2026-57455 vim Fixed in: 2:7.4.052-1ubuntu3.1+esm30