CVE-2026-26269 [Medium] | Memory Corruption in Vim

Vim is an open source, command line text editor. Prior to 9.1.2148, a stack buffer overflow vulnerability exists in Vim's NetBeans integration when processing the specialKeys command, affecting Vim builds that enable and use the NetBeans feature. The Stack buffer overflow exists in special_keys() (in src/netbeans.c). The while (*tok) loop writes two bytes per iteration into a 64-byte stack buffer (keybuf) with no bounds check. A malicious NetBeans server can overflow keybuf with a single specialKeys command. The issue has been fixed as of Vim patch v9.1.2148.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.03%	0.28%	+0.25%
2	2026-02-14	—	0.03%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.03%

0.28%

+0.25%

2026-02-14

—

0.03%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.4	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	2.8	2.5	[email protected]
7.5	3.1	HIGH	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.6	5.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.4

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

2.8

2.5

[email protected]

7.5

3.1

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.6

5.9

[email protected]

OS Trackers for CVE-2026-26269

vendor	priority	summary	link
`alpine`	—	CVE-2026-26269: 1 source package rows (vim); 315 state rows across 7 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, 3.23-main, edge-community, edge-main); fixed 0, open 315.	https://security.alpinelinux.org/vuln/CVE-2026-26269
`debian`	not yet assigned	CVE-2026-26269 not yet assigned priority: Debian including 1 source packages (vim), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 3, resolved 2.	https://security-tracker.debian.org/tracker/CVE-2026-26269
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2026-26269
`suse`	medium	CVE-2026-26269 severity moderate: SUSE including 303 source package names (13.2-9.95:glibc-2.38-slfo.1.1_6.1, 13.2-9.95:glibc-locale-2.38-slfo.1.1_6.1, …), 572 product×package rows across 108 product lines (Container rancher/elemental-channel/sl-micro, Container suse/manager/5.0/x86_64/server, … (108 product lines)): Fixed 335, Known Affected 231, First Fixed 6.	https://www.suse.com/security/cve/CVE-2026-26269/
`ubuntu`	low	CVE-2026-26269 low priority: Ubuntu including 1 source packages (vim), 8 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): released 8.	https://ubuntu.com/security/CVE-2026-26269

Affected software / configurations for CVE-2026-26269

Vendor	Product	Version	Raw CPE
vim	vim	< 9.1.2148	cpe:2.3:a:vim:vim::::::::

References for CVE-2026-26269

URL	Tags
https://github.com/vim/vim/commit/c5f312aad8e4179e437f81ad39a860cd0ef11970	Patch
https://github.com/vim/vim/releases/tag/v9.1.2148	Release Notes
https://github.com/vim/vim/security/advisories/GHSA-9w5c-hwr9-hc68	Patch Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/02/13/2	Mailing List Patch Third Party Advisory

URL

CVE-2026-26269 | Vim has a Netbeans specialKeys Stack Buffer Overflow

Exploit prediction scoring system (EPSS) score for CVE-2026-26269

Common vulnerability scoring system (CVSS) metrics for CVE-2026-26269

Weakness enumeration for CVE-2026-26269

OS Trackers for CVE-2026-26269

Affected software / configurations for CVE-2026-26269

References for CVE-2026-26269