Editor crash via unterminated terminal cell array
Published Jun 11, 2026 · Updated Jun 11, 2026
Out-of-bounds read in Vim before 9.2.0565 allows attackers to crash the editor via crafted output in a :terminal window. update_snapshot() walks a six-entry cell.chars[] array until NUL, although libvterm omits that terminator when a base character and five combining marks fill every slot. Exploitation requires terminal support and a screen snapshot, such as when the terminal job exits or Terminal-Normal mode begins; the demonstrated consequence is an editor crash.
Summary
What happened
Out-of-bounds read in Vim before 9.2.0565 allows attackers to crash the editor via crafted output in a :terminal window. update_snapshot() walks a six-entry cell.chars[] array until NUL, although libvterm omits that terminator when a base character and five combining marks fill every slot. Exploitation requires terminal support and a screen snapshot, such as when the terminal job exits or Terminal-Normal mode begins; the demonstrated consequence is an editor crash.
The record
- CVE
- CVE-2026-52859
- Published
- Jun 11, 2026
- Updated
- Jun 11, 2026
- Vendor
- Vim
- Product
- Vim
- Classifications
- CWE-125, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 11, 2026CVE publishedPublication date reported by the CVE source.
- Jun 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 9.2.0565
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Public exploit references
- Vim terminal snapshot regression reproducerproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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