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CVE Record

CVE-2026-34982: Vim modeline bypass via various options affects Vim < 9.2.0276

Vim is an open source, command line text editor. Prior to version 9.2.0276, a modeline sandbox bypass in Vim allows arbitrary OS command execution when a user opens a crafted file. The `complete`, `guitabtooltip` and `printheader` options are missing the `P_MLE` flag, allowing a modeline to be executed. Additionally, the `mapset()` function lacks a `check_secure()` call, allowing it to be abused from sandboxed expressions. Commit 9.2.0276 fixes the issue.

HighCVSS 8.2Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A crafted text file can make vulnerable Vim versions run operating-system commands when a user opens it. This matters most where developers, administrators, or automation accounts open files from email, repositories, tickets, archives, or other untrusted sources.

Executive priority

Treat as high priority for developer and administrator environments. The vulnerability needs user interaction, but the potential outcome is command execution in a trusted user context, which can expose credentials, source code, and operational systems.

Technical view

Vim before 9.2.0276 has a modeline sandbox bypass. The complete, guitabtooltip, and printheader options lacked the P_MLE flag, and mapset() lacked check_secure(), allowing sandboxed expression abuse. The CVSS 3.1 score is 8.2 with local attack vector and required user interaction.

Likely exposure

Exposure is likely on developer workstations, admin jump hosts, servers, containers, and build images running Vim below 9.2.0276. Risk increases where users open third-party files, cloned repositories, support artifacts, or downloaded text files in Vim.

Exploitation context

The source bundle does not show CISA KEV listing or active exploitation. Exploitation requires a victim to open a crafted file in vulnerable Vim, but the reported impact is arbitrary OS command execution with high confidentiality and integrity impact.

Researcher notes

The key implementation issues are missing modeline restrictions on specific options and absent secure-context checking in mapset(). Evidence in the bundle identifies the upstream fix commit and release, but does not provide active exploitation confirmation.

Mitigation direction

  • Upgrade Vim to 9.2.0276 or a vendor-backported fixed package.
  • Apply relevant Red Hat security errata where Red Hat packages are in use.
  • Prioritize systems used by developers, administrators, and automation operators.
  • Avoid opening untrusted files in vulnerable Vim until patched.
  • Check vendor guidance for any interim controls or platform-specific fixes.

Validation and detection

  • Inventory Vim versions across endpoints, servers, containers, and base images.
  • Confirm installed packages include the 9.2.0276 fix or vendor backport.
  • Review Red Hat advisory applicability for affected Red Hat environments.
  • Identify workflows where users open external files in Vim.
  • Track remediation evidence in vulnerability management records.
Prepared
Confidence
high
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-78: Command execution behavior lookup

Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2026-34982 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
8.2 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
3ADP providers
28Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We 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.

ScoreVersionSeverityVectorExploitImpactSource
8.2CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N1.85.8GitHub_M
8.2CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N1.85.8redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

8.2High
CVSS 3.1 vector shape for CVE-2026-34982Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPvim: arbitrary command execution via modeline sandbox bypass
other:Red Hat severity ratingcvssV3_1
  • 2026-04-06T16:02:10.004Z: Reported to Red Hat.
  • 2026-04-06T15:16:48.809Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
vimvim< 9.2.0276Listed
Weakness

CWE details

CWE-78

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.