Heap out-of-bounds write via stale soundfold index
Published Aug 11, 2026 · Updated Aug 11, 2026
Heap-based buffer overflow in Vim before 9.2.0846 allows context-dependent attackers to corrupt heap memory through a crafted spell file. set_sofo() reuses sl_sal_first[] after set_sal_first() leaves negative entries, under-counting mapping lists and writing attacker-influenced characters past the allocation. Exploitation requires a spell-and-multibyte build, placement of the file in a searched spell directory, and victim selection through 'spelllang'; a crash is demonstrated, while further effects are unproven.
Summary
What happened
Heap-based buffer overflow in Vim before 9.2.0846 allows context-dependent attackers to corrupt heap memory through a crafted spell file. set_sofo() reuses sl_sal_first[] after set_sal_first() leaves negative entries, under-counting mapping lists and writing attacker-influenced characters past the allocation. Exploitation requires a spell-and-multibyte build, placement of the file in a searched spell directory, and victim selection through 'spelllang'; a crash is demonstrated, while further effects are unproven.
The record
- CVE
- CVE-2026-73072
- Published
- Aug 11, 2026
- Updated
- Aug 11, 2026
- Vendor
- Vim
- Product
- Vim
- Classifications
- CWE-122, CWE-787, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 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=< 9.2.0846
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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