CVE-2026-43197VulnerabilityPublished 7 May 2026Updated 24 Sep 2026

Microsoft · netconsole: avoid OOB reads, msg is not nul-terminated

Affects MicrosoftSource GCVE Database

Authoritative record:CVE-2026-43197· Critical 9.1

Not known to be exploited · CVSS 9.1 Critical · fixed in 3126a2f98beaec5a554a1fb31c46db1e8542665e : patch Microsoft as a priority.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

9.1Critical

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.5% chance of exploitation in 30 days – higher than 47% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 3126a2f98beaec5a554a1fb31c46db1e8542665e, 82aec772fca2223bc5774bd9af486fd95766e578, 74ab1456eaa3b2eb986138f9e1f4cb37e73b6f58 +2

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

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

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 6 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

microsoft-security-response-ce

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ c62c0a17f9b7398022f9eebe547878033264f81f, < 3126a2f98beaec5a554a1fb31c46db1e8542665e	Fixed in 3126a2f98beaec5a554a1fb31c46db1e8542665e
LinuxLinux	Affected ≥ c62c0a17f9b7398022f9eebe547878033264f81f, < 82aec772fca2223bc5774bd9af486fd95766e578	Fixed in 82aec772fca2223bc5774bd9af486fd95766e578
LinuxLinux	Affected ≥ c62c0a17f9b7398022f9eebe547878033264f81f, < 74ab1456eaa3b2eb986138f9e1f4cb37e73b6f58	Fixed in 74ab1456eaa3b2eb986138f9e1f4cb37e73b6f58
LinuxLinux	Affected ≥ c62c0a17f9b7398022f9eebe547878033264f81f, < 68fe91df6ea822dae772fceaad0686e4f5839aec	Fixed in 68fe91df6ea822dae772fceaad0686e4f5839aec
LinuxLinux	Affected ≥ c62c0a17f9b7398022f9eebe547878033264f81f, < 8fe132c4873f9eb1b86ddbf31216e9d961a0b8b9	Fixed in 8fe132c4873f9eb1b86ddbf31216e9d961a0b8b9
LinuxLinux	Affected =6.6	Fixed in–

Description

CVE-2026-43197 is a vulnerability in Microsoft software version 3.0 related to the netconsole component, where out-of-bounds (OOB) reads may occur because a message is not null-terminated. The vulnerability could potentially lead to memory safety issues. No CVSS score or detailed impact information is provided. No known exploits are reported in the wild.

Impact

The vulnerability may cause out-of-bounds memory reads, which can lead to potential memory corruption or information disclosure. However, no confirmed exploit or detailed impact analysis is available from the provided data.

Summary

This vulnerability involves the netconsole feature in Microsoft software version 3.0, where the message buffer is not properly null-terminated, leading to out-of-bounds reads. The lack of null termination can cause the system to read beyond the intended memory boundary, which may result in undefined behavior or memory corruption. The advisory does not provide further technical details, exploit information, or impact specifics.

CWE-125Out-of-bounds Read (opens in a new tab)
Base weaknessCWE Top 25 (2025): #8
The product reads data past the end, or before the beginning, of the intended buffer.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
Architecture and Design · Language Selection
Use a language that provides appropriate memory abstractions.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
Overread Buffers (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 29 Jun 2026, 22:54 UTC

WeaknessesCWE-125

Technical details

References

Community reviews

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