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Vim CVE-2026-73070

| EUVDEUVD-2026-56222 MEDIUM
Stack-based Buffer Overflow (CWE-121)
2026-08-11 GitHub_M
Stack Overflow Buffer Overflow Vim Red Hat Suse
6.8
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
6.8 MEDIUM
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.5 MEDIUM

Local socket access by a low-privilege process is sufficient; vendor CVSS confirms no confidentiality or integrity impact; availability is high due to server crash.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
6.1 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Aug 11, 2026 - 17:02 EUVD
Source Code Evidence Fetched
Aug 11, 2026 - 16:16 vuln.today
Analysis Generated
Aug 11, 2026 - 16:16 vuln.today

DescriptionCVE.org

Vim is an open source, command line text editor. Prior to 9.2.0842, the socket server backend in src/socketserver.c accepts unbounded client connections in socketserver_accept(), causing descriptors to overflow fd_set structures in src/channel.c and fixed-size struct pollfd arrays in src/os_unix.c, which allows a local process that can connect to the server socket to corrupt stack memory or terminate the Vim server. This issue is fixed in version 9.2.0842.

AnalysisAI

Stack-based buffer overflow in Vim's socket server backend prior to version 9.2.0842 allows a local process with access to the Vim server socket to corrupt stack memory or crash the Vim server by flooding it with client connections. The unbounded accept loop in socketserver_accept() causes file descriptors to exceed the compile-time bounds of fd_set structures and struct pollfd arrays allocated on the stack in src/channel.c and src/os_unix.c. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Run Vim with --clientserver socket enabled
Delivery
Enumerate or guess server socket address
Exploit
Open 100+ concurrent connections in rapid succession
Execution
Exhaust fd_set and pollfd array bounds
Persist
Corrupt stack memory via out-of-bounds write
Impact
Crash or destabilize the Vim server process
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Vulnerability AssessmentAI

Exploitation Exploitation requires that Vim is running with the socket server feature explicitly enabled via the --clientserver socket argument or an equivalent server-mode invocation - this is not the default mode in any standard Vim installation or common distribution package. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N) scores 6.8, reflecting a local, low-complexity attack requiring low privileges with high availability impact and no confidentiality or integrity impact per the vendor's assessment. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A local user or compromised process on the same host opens over 100 concurrent connections to the Vim socket server (for example, iterating ch_open() calls against localhost:2001), rapidly exhausting the compile-time-bounded fd_set and pollfd arrays. The resulting out-of-bounds writes to stack memory crash the Vim server, disrupting any IDE integration, editor automation, or scripting pipeline that depends on it. …
Remediation Upgrade to Vim 9.2.0842 or later, available at https://github.com/vim/vim/releases/tag/v9.2.0842; the authoritative fix commit is https://github.com/vim/vim/commit/5598618b2daf8e36b3bf0251caaefcf0bf8e85e4. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-121 – Stack-based Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Moderate
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CVE-2026-73070 vulnerability details – vuln.today
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