CVE-2026-55693

HIGHNVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 97% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
7.8
EG Score
7.8(medium)
EPSS
2.6%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 26, 2026

Advisory Details (2)

Auto-updated Jun 25, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Out-of-bounds Write in Spell File Word Count in Vim < 9.2.0653 · Advisory · vim/vim · GitHub

https://github.com/vim/vim/security/advisories/GHSA-wgh4-64f7-q3jq
github_commit

commit a80874d9b84a (vim/vim)

Fix landed in vim/vim commit a80874d9b84a — awaiting tagged release

https://github.com/vim/vim/commit/a80874d9b84a01040e3d1aef2d4a59e1934dafb7

Vendor Advisories for CVE-2026-55693(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxxd (2:8.2.3995-1ubuntu2.33) @ jammy2026-07-06ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 35× in last 7d / 51× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 22:32 UTCEG score recompute
  2. 2026-07-06 22:32 UTCVendor advisory
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 10:15 UTCEG score recompute
  6. 2026-07-06 10:15 UTCVendor advisory
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 21:57 UTCEG score recompute
  10. 2026-07-05 21:57 UTCVendor advisory
  11. 2026-07-05 09:41 UTCEG score recompute
  12. 2026-07-05 09:41 UTCVendor advisory
  13. 2026-07-05 02:31 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-04 21:25 UTCEG score recompute
  16. 2026-07-04 21:25 UTCVendor advisory
  17. 2026-07-04 09:09 UTCEG score recompute
  18. 2026-07-04 09:09 UTCVendor advisory
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 06:31 UTCEPSS rescore
  21. 2026-07-03 20:54 UTCEG score recompute
  22. 2026-07-03 20:54 UTCVendor advisory
  23. 2026-07-03 08:37 UTCEG score recompute
  24. 2026-07-03 08:37 UTCVendor advisory
  25. 2026-07-02 20:21 UTCEG score recompute
Show 26 more
  1. 2026-07-02 20:21 UTCVendor advisory
  2. 2026-07-02 08:05 UTCEG score recompute
  3. 2026-07-02 08:05 UTCVendor advisory
  4. 2026-07-01 19:47 UTCEG score recompute
  5. 2026-07-01 19:47 UTCVendor advisory
  6. 2026-07-01 07:31 UTCEG score recompute
  7. 2026-07-01 07:31 UTCVendor advisory
  8. 2026-06-30 23:22 UTCEPSS rescore
  9. 2026-06-30 19:15 UTCEG score recompute
  10. 2026-06-30 06:58 UTCEG score recompute
  11. 2026-06-29 18:41 UTCEG score recompute
  12. 2026-06-29 14:06 UTCEPSS rescore
  13. 2026-06-29 14:06 UTCEPSS rescore
  14. 2026-06-29 06:25 UTCEG score recompute
  15. 2026-06-28 18:06 UTCEG score recompute
  16. 2026-06-28 14:07 UTCEPSS rescore
  17. 2026-06-28 05:48 UTCEG score recompute
  18. 2026-06-28 04:56 UTCEPSS rescore
  19. 2026-06-28 04:56 UTCEPSS rescore
  20. 2026-06-27 17:31 UTCEG score recompute
  21. 2026-06-27 05:15 UTCEG score recompute
  22. 2026-06-27 03:08 UTCEPSS rescore
  23. 2026-06-26 16:59 UTCEG score recompute▲ 2.10
  24. 2026-06-26 03:58 UTCNVD updateCVSS v3 → 7.8 · severity → HIGH
  25. 2026-06-25 17:50 UTCEG score recompute
  26. 2026-06-25 17:48 UTCNVD updatefirst tracked

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-55693?
CVE-2026-55693 is a high vulnerability published on June 25, 2026. Vim is an open source, command line text editor. Prior to 9.2.0653, the treecountwords() 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…
When was CVE-2026-55693 disclosed?
CVE-2026-55693 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55693 actively exploited?
CVE-2026-55693 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-55693?
CVE-2026-55693 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-55693?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55693, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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