Security readout for executives and security teams
CVE-2026-28420 is a memory-safety flaw in Vim’s built-in terminal emulator. A user must open or process crafted terminal content that triggers unusual Unicode combining-character handling. The published severity is medium because exploitation requires user interaction and local context, but successful triggering may corrupt memory and affect integrity or availability. Systems with Vim versions earlier than 9.2.0076 are potentially exposed, especially where users use :terminal or open untrusted terminal output/files. Server exposure is lower unless interactive users run Vim with attacker-influenced content. Treat as a routine but real patching item. It is not currently reported as exploited, but Vim is widely deployed and memory bugs can create operational risk. Patch in normal endpoint and developer workstation cycles, faster for high-risk user environments. Mitigation focus: Upgrade Vim to version 9.2.0076 or later.; Prioritize systems where users handle untrusted terminal output in Vim.; If immediate upgrade is not possible, check vendor distribution guidance..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-122: Exact CWE lookup
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Open ATT&CK lookupCWE-125: Exact CWE lookup
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Open ATT&CK lookupCVE-2026-28420 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
CNA and ADP enrichment extracted from CVE v5
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CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L1.82.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.4MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/vim/vim/security/advisories/GHSA-rvj2-jrf9-2phgCVE reference · x_refsource_CONFIRM
- https://github.com/vim/vim/commit/bb6de2105b160e729c34063CVE reference · x_refsource_MISC
- https://github.com/vim/vim/releases/tag/v9.2.0076CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Heap-based Buffer Overflow
Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.