Vim: Out-of-bounds Write in Spell File Word Count
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 28 fixed, 1 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA vim (vim) Fixed in 9.2.0653
Red Hat 64 advisories
- RHSA-2026:92452 Released 2026-10-29 · Red Hat rating CriticalRed Hat Enterprise Linux AI 3.5.2 enhancement update
- Red Hat Enterprise Linux AI 3.5 registry.redhat.io/rhelai3/bootc-aws-cuda-rhel9, registry.redhat.io/rhelai3/bootc-azure-cuda-rhel9, registry.redhat.io/rhelai3/bootc-azure-rocm-rhel9 +3
- RHSA-2026:92449 Released 2026-10-29 · Red Hat rating CriticalRed Hat Enterprise Linux AI 3.5.2 enhancement update
- Red Hat Enterprise Linux AI 3.5 registry.redhat.io/rhelai3/disk-image-cuda-rhel9
- RHSA-2026:82415 Released 2026-10-13 · Red Hat rating CriticalRed Hat AI Inference 3.5.2 (cpu)
- Red Hat AI Inference Server 3.5 registry.redhat.io/rhaii/vllm-cpu-rhel9
Show 61 more Red Hat advisories
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- RHSA-2026:75652 Released 2026-10-05 · Red Hat rating ImportantRed Hat AI Base Images 3.5.2 (CPU)
- Red Hat OpenShift AI 3.5 registry.redhat.io/rhai/base-image-cpu-rhel9
- RHSA-2026:74771 Released 2026-10-01 · Red Hat rating ImportantRed Hat AI Base Images 3.5.2 (Gaudi)
- Red Hat OpenShift AI 3.5 registry.redhat.io/rhai/base-image-gaudi-rhel9
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- RHSA-2026:73929 Released 2026-09-30 · Red Hat rating ImportantRed Hat AI Inference Server 3.2.2 (cuda)
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- RHSA-2026:72465 Released 2026-09-28 · Red Hat rating Importantvim security update
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- Red Hat Enterprise Linux BaseOS (v. 8) vim-2:8.0.1763-31.el8_10
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- Red Hat Enterprise Linux BaseOS (v. 9) vim-2:8.2.2637-26.el9_8.13
- RHSA-2026:30267 Released 2026-06-26 · Red Hat rating ModerateRed Hat Hardened Images RPMs bug fix and enhancement update
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Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet |
| Red Hat AI Inference Server 3.2 | Fixed | RHSA-2026:73859, RHSA-2026:73929, RHSA-2026:73930 |
| Red Hat AI Inference Server 3.5 | Fixed | RHSA-2026:82059, RHSA-2026:82061, RHSA-2026:82066, RHSA-2026:82368, RHSA-2026:82371, RHSA-2026:82415 |
| Red Hat Enterprise Linux AI 3.5 | Fixed | RHSA-2026:92449, RHSA-2026:92452 |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:48650 |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2026:48703 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:47982 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2026:72466 |
| Red Hat Enterprise Linux AppStream E4S (v.9.4) | Fixed | RHSA-2026:72465 |
| Red Hat Enterprise Linux AppStream EUS (v. 10.0) | Fixed | RHSA-2026:55431 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:70818 |
| Red Hat Enterprise Linux BaseOS (v. 10) | Fixed | RHSA-2026:48650 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2026:48703 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2026:47982 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.2) | Fixed | RHSA-2026:72466 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.4) | Fixed | RHSA-2026:72465 |
| Red Hat Enterprise Linux BaseOS EUS (v. 10.0) | Fixed | RHSA-2026:55431 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.6) | Fixed | RHSA-2026:70818 |
| Red Hat Enterprise Linux Server (v. 7 ELS) | Fixed | RHSA-2026:68711 |
| Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION) | Fixed | RHSA-2026:69128 |
| Red Hat Hardened Images | Fixed | RHSA-2026:30267 |
| Red Hat Insights proxy 1.5 | Fixed | RHSA-2026:53371 |
| Red Hat OpenShift AI 3.0 | Fixed | RHSA-2026:73909, RHSA-2026:73959, RHSA-2026:73960, RHSA-2026:73961, RHSA-2026:73962 |
| Red Hat OpenShift AI 3.2 | Fixed | RHSA-2026:74458, RHSA-2026:74459, RHSA-2026:74460, RHSA-2026:74461, RHSA-2026:74462, RHSA-2026:74463 |
| Red Hat OpenShift AI 3.3 | Fixed | RHSA-2026:74359, RHSA-2026:74360, RHSA-2026:74361, RHSA-2026:74362, RHSA-2026:74363, RHSA-2026:74364, RHSA-2026:74365, RHSA-2026:74450, RHSA-2026:80756, RHSA-2026:81127 |
| Red Hat OpenShift AI 3.4 | Fixed | RHSA-2026:74674, RHSA-2026:74677, RHSA-2026:74678, RHSA-2026:74679, RHSA-2026:74681, RHSA-2026:74683, RHSA-2026:74685, RHSA-2026:74687, RHSA-2026:74688 |
| Red Hat OpenShift AI 3.5 | Fixed | RHSA-2026:74771, RHSA-2026:75652, RHSA-2026:75654, RHSA-2026:75655, RHSA-2026:75657, RHSA-2026:75658, RHSA-2026:75659, RHSA-2026:75660, RHSA-2026:76042 |
| Red Hat OpenShift Container Platform 4.22 | Fixed | RHSA-2026:54769 |
| Red Hat Update Infrastructure 5 | Fixed | RHSA-2026:54387, RHSA-2026:58981 |
Not affected: 12 products
- Red Hat Enterprise Linux AppStream (v. 10)
- Red Hat Enterprise Linux AppStream (v. 8)
- Red Hat Enterprise Linux AppStream (v. 9)
- Red Hat Enterprise Linux AppStream EUS (v. 10.0)
- Red Hat Enterprise Linux BaseOS (v. 10)
- Red Hat Enterprise Linux BaseOS (v. 8)
- Red Hat Enterprise Linux BaseOS (v. 9)
- Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
- Red Hat Enterprise Linux Server (v. 7 ELS)
- Red Hat Enterprise Linux Server -EXTENSION(v. 6 ELS-EXTENSION)
- Red Hat OpenShift Container Platform 4
- Red Hat Update Infrastructure 5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-55693
- 2026-10-05 Fix available: RHSA-2026:75659 · Red Hat
- 2026-10-05 Fix available: RHSA-2026:75660 · Red Hat
- 2026-10-05 Fix available: RHSA-2026:75655 · Red Hat
- 2026-10-05 Fix available: RHSA-2026:75657 · Red Hat
- 2026-10-05 Fix available: RHSA-2026:75654 · Red Hat
- 2026-10-05 Fix available: RHSA-2026:75652 · Red Hat
- 2026-10-05 Fix available: RHSA-2026:75658 · Red Hat
- 2026-10-05 Affected versions changed · Red Hat
- 2026-10-06 Fix available: RHSA-2026:76042 · Red Hat
- 2026-10-06 Affected versions changed · Red Hat
- 2026-10-13 Fix available: RHSA-2026:82066 · Red Hat
- 2026-10-13 Fix available: RHSA-2026:80756 · Red Hat
- 2026-10-13 Fix available: RHSA-2026:81127 · Red Hat
- 2026-10-13 Fix available: RHSA-2026:82061 · Red Hat
- 2026-10-13 Fix available: RHSA-2026:82059 · Red Hat
- 2026-10-13 Fix available: Red Hat AI Inference Server 3.5 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82368 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82415 · Red Hat
- 2026-10-14 Fix available: RHSA-2026:82371 · Red Hat
- 2026-10-15 Affected versions changed · Red Hat
- 2026-10-30 Fix available: RHSA-2026:92452 · Red Hat
- 2026-10-30 Fix available: RHSA-2026:92449 · Red Hat
- 2026-10-30 Fix available: Red Hat Enterprise Linux AI 3.5 · Red Hat
- 2026-11-01 Affected versions changed · Red Hat
References
More Vim vulnerabilities
- TI-2022-03248 Heap-based Buffer Overflow in vim/vim CVSS 3.1CRITICAL 9.8
- TI-2024-15103 Vim before 9.0.2142 has a stack-based buffer overflow because did_set_langmap in map.c… CVSS 3.1HIGH 7.8
- TI-2023-05093 Use After Free in vim/vim CVSS 3.1HIGH 7.8
- TI-2023-04407 Heap-based Buffer Overflow in vim/vim CVSS 3.1HIGH 7.8
- TI-2023-04379 Heap-based Buffer Overflow in vim/vim CVSS 3.1HIGH 7.8
- TI-2023-04378 Use After Free in vim/vim CVSS 3.1HIGH 7.8
Sources
- CVE-2026-55693 · CVE Program
- CVE-2026-55693 · NVD
- FIRST EPSS
- CVE-2026-55693 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences