CVE-2026-59857Public exploit

Editor crash via SAL soundfolding off-by-one

Published Jul 9, 2026 · Updated Jul 9, 2026

Out-of-bounds write in Vim before 9.2.0725 allows local users to crash the editor through a boundary-length soundfold() word. spell_soundfold_sal() permits reslen to reach MAXWLEN, then stores a NUL at res[MAXWLEN], one byte beyond the caller-owned stack buffer. Reachability requires a SAL-based spell language, a non-multibyte 8-bit encoding rather than default UTF-8, and direct or suggestion-driven soundfold() processing.

CVSS severity5.6
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds write in Vim before 9.2.0725 allows local users to crash the editor through a boundary-length soundfold() word. spell_soundfold_sal() permits reslen to reach MAXWLEN, then stores a NUL at res[MAXWLEN], one byte beyond the caller-owned stack buffer. Reachability requires a SAL-based spell language, a non-multibyte 8-bit encoding rather than default UTF-8, and direct or suggestion-driven soundfold() processing.

The record

CVE
CVE-2026-59857
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
Vim
Product
Vim
Classifications
CWE-787, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 9.2.0725

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Vim · Vimversion=< 9.2.0725

Published CVSS scores

5.6GitHub, Inc.CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo