CVE-2026-57455
CVE-2026-57455 is a high-severity vulnerability in Vim with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.
Key facts
- Severity: High (CVSS 3.x base score 7.8)
- CVSS v4: 4.0
- EPSS exploit prediction: 0% (2nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-39437
- Weakness: CWE-787
- Affected product: Vim
- Published:
- Last modified:
Description
Vim is an open source, command line text editor. Prior to 9.2.0698, the single-byte branch of spell_soundfold_sofo() in src/spell.c translates a word through a spell file's SOFO (sound-folding) byte map into a caller-owned result buffer. Its copy loop advances the output index ri with no upper bound and terminates only on the input NUL, writing one byte per input byte into the MAXWLEN-element stack buffer the caller provides. A word longer than MAXWLEN, passed to soundfold() (or reached via sound-based spell suggestion) while a SOFO-based spell language is active, therefore writes past the end of that buffer. This is a stack out-of-bounds write that corrupts the call frame and crashes the editor. This vulnerability is fixed in 9.2.0698.
Frequently asked questions
- What is CVE-2026-57455?
- Vim is an open source, command line text editor. Prior to 9.2.0698, the single-byte branch of spell_soundfold_sofo() in src/spell.c translates a word through a spell file's SOFO (sound-folding) byte map into a caller-owned result buffer. Its copy loop advances the output index ri with no upper bound and terminates only on the input NUL, writing one byte per input byte into the MAXWLEN-element stack buffer the caller provides. A word longer than MAXWLEN, passed to soundfold() (or reached via sound-based spell suggestion) while a SOFO-based spell language is active, therefore writes past the end of that buffer. This is a stack out-of-bounds write that corrupts the call frame and crashes the editor. This vulnerability is fixed in 9.2.0698.
- How severe is CVE-2026-57455?
- CVE-2026-57455 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-57455 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (2nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-57455?
- CVE-2026-57455 affects Vim. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-57455?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2026-57455 have an EU (EUVD) identifier?
- Yes. CVE-2026-57455 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-39437.
- When was CVE-2026-57455 published?
- CVE-2026-57455 was published on 2026-06-25 and last updated on 2026-06-26.
References
- https://github.com/vim/vim/commit/497f931f85339d175d7f69588dd249e8ccfed41b
- https://github.com/vim/vim/releases/tag/v9.2.0698
- https://github.com/vim/vim/security/advisories/GHSA-q8mh-6qm3-25g4
Affected products (1)
- cpe:2.3:a:vim:vim:*:*:*:*:*:*:*:*
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