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CVE-2026-55693

Status: AnalyzedMedium (5.7)—

Vim is an open source, command line text editor. Prior to 9.2.0653, the tree_count_words() function in src/spellfile.c fills in the word-count fields of a spell-file word trie by walking it iteratively with a depth counter. The counter is bounded only by the trie structure itself; it is never checked against the size of the fixed MAXWLEN-element stack arrays it indexes (arridx[], curi[], wordcount[]). A crafted .spl/.sug file pair, loaded when the user invokes spell suggestion, can drive the descent arbitrarily deep, so the function writes past the end of those arrays. This is a stack out-of-bounds write that corrupts the call frame and crashes the editor. This vulnerability is fixed in 9.2.0653.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

VIM — VIM

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-55693",
  "cveTags": [],
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          "version": "2.0.3",
          "timestamp": "2026-06-26T14:02:19.096753Z"
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          "userInteraction": "REQUIRED",
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    }
  ],
  "lastModified": "2026-06-26T14:17:05.597",
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