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Vim CVE-2026-57451

| EUVDEUVD-2026-39449 MEDIUM
Out-of-bounds Read (CWE-125)
2026-06-25 GitHub_M
Buffer Overflow Information Disclosure Red Hat Vim Suse
6.1
CVSS 3.1 · NVD
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Severity by source

Vendor (GitHub_M) PRIMARY
MEDIUM
qualitative
NVD
6.1 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
vuln.today AI
5.3 MEDIUM

Local delivery via crafted undo file demands precise binary manipulation (AC:H) and user-initiated load (UI:R); OOB read crashes Vim (A:H) with marginal heap-byte exposure (C:L) and no integrity impact.

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

Primary rating from Vendor (GitHub_M).

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High

Lifecycle Timeline

4
CVSS changed
Jun 26, 2026 - 04:22 NVD
5.3 (MEDIUM) 6.1 (MEDIUM)
Patch available
Jun 25, 2026 - 17:02 EUVD
Source Code Evidence Fetched
Jun 25, 2026 - 16:25 vuln.today
Analysis Generated
Jun 25, 2026 - 16:25 vuln.today

DescriptionNVD

Vim is an open source, command line text editor. Prior to 9.2.0670, get_text_props() in src/textprop.c reads a uint16 property count stored inline after a line's text and returns it as the number of 32-byte textprop_T entries that follow. The only check is a floor that guarantees room for a single entry; the count is never checked against the amount of data actually present. A line that declares a large count while carrying little data causes consumers to read far past the end of the line buffer. Such a line can be delivered through a crafted undo file, leading to a crash. This vulnerability is fixed in 9.2.0670.

AnalysisAI

Out-of-bounds read in Vim's text property subsystem allows a crafted undo file to crash the editor and potentially disclose adjacent heap memory. All Vim releases prior to 9.2.0670 are affected; the vulnerability is reachable whenever a user loads a malicious undo file with the persistent-undo feature compiled in and enabled. No public exploit or CISA KEV listing exists at time of analysis, placing real-world risk in the low-to-medium range despite the local crash severity.

Technical ContextAI

The flaw (CWE-125, Out-of-bounds Read) lives in src/textprop.c:get_text_props() and is shared by three additional call sites: adjust_text_props_for_delete() and ml_delete_int() in src/memline.c, and um_goto_line() in the unpacked-memline path. Vim stores text properties as a uint16 count field inline immediately after a line's text bytes, followed by that many 32-byte textprop_T structs. The sole pre-patch validation was a floor ensuring at least one struct fits; the count was never bounded against propdata_len. CPE cpe:2.3:a:vim:vim:*:*:*:*:*:*:*:* covers all releases. The fix introduces text_prop_count_valid(int prop_count, size_t propdata_len) enforcing prop_count * sizeof(textprop_T) <= propdata_len - PROP_COUNT_SIZE, applied consistently at every consumer site.

RemediationAI

Upgrade to Vim 9.2.0670 or later; the patch commit b2338ca90643e2f01ecb6547c1172716aaec4f79 and release tag at https://github.com/vim/vim/releases/tag/v9.2.0670 are both confirmed. If immediate upgrade is not feasible, add 'set noundofile' to ~/.vimrc or the system-wide vimrc to disable persistent undo entirely - this prevents automatic loading of .un~ undo files from untrusted directories; the trade-off is loss of cross-session undo history. Users should also avoid executing ':rundo' on files from untrusted sources regardless of patch status. No other official workaround is documented in the advisory at https://github.com/vim/vim/security/advisories/GHSA-f36c-2qcp-7gpw.

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Same weakness CWE-125 – Out-of-bounds Read

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SLES15-SP5-CHOST-BYOS-SAP-CCloud Affected
SLES15-SP6-CHOST-BYOS Affected
SLES15-SP6-CHOST-BYOS-Aliyun Affected
SLES15-SP6-CHOST-BYOS-Azure Affected
SLES15-SP6-CHOST-BYOS-EC2 Affected

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CVE-2026-57451 vulnerability details – vuln.today
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