CVE-2026-23669
published 2026-03-10CVE-2026-23669: Use after free in RPC Runtime allows an authorized attacker to execute code over a network.
PriorityP260high8.8CVSS 3.1
AVNACLPRLUINSUCHIHAH
EPSS
0.91%
56.0th percentile
Use after free in RPC Runtime allows an authorized attacker to execute code over a network.
Affected
43 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_10_1607 | < 10.0.14393.8957 | 10.0.14393.8957 |
| microsoft | windows_10_1809 | < 10.0.17763.8511 | 10.0.17763.8511 |
| microsoft | windows_10_21h2 | < 10.0.19044.7058 | 10.0.19044.7058 |
| microsoft | windows_10_22h2 | < 10.0.19045.7058 | 10.0.19045.7058 |
| microsoft | windows_10_version_1607 | >= 10.0.14393.0 < 10.0.14393.8957 | 10.0.14393.8957 |
| microsoft | windows_10_version_1809 | >= 10.0.17763.0 < 10.0.17763.8511 | 10.0.17763.8511 |
| microsoft | windows_10_version_21h2 | >= 10.0.19044.0 < 10.0.19044.7058 | 10.0.19044.7058 |
| microsoft | windows_10_version_22h2 | >= 10.0.19045.0 < 10.0.19045.7058 | 10.0.19045.7058 |
| microsoft | windows_11_23h2 | < 10.0.22631.6783 | 10.0.22631.6783 |
| microsoft | windows_11_24h2 | < 10.0.26100.7979 | 10.0.26100.7979 |
| microsoft | windows_11_25h2 | < 10.0.26200.7979 | 10.0.26200.7979 |
| microsoft | windows_11_26h1 | < 10.0.28000.1719 | 10.0.28000.1719 |
| microsoft | windows_11_version_22h3 | >= 10.0.22631.0 < 10.0.22631.6783 | 10.0.22631.6783 |
| microsoft | windows_11_version_23h2 | >= 10.0.22631.0 < 10.0.22631.6783 | 10.0.22631.6783 |
| microsoft | windows_11_version_24h2 | >= 10.0.26100.0 < 10.0.26100.8037 | 10.0.26100.8037 |
| microsoft | windows_11_version_25h2 | >= 10.0.26200.0 < 10.0.26200.8037 | 10.0.26200.8037 |
| microsoft | windows_11_version_26h1 | >= 10.0.28000.0 < 10.0.28000.1719 | 10.0.28000.1719 |
| microsoft | windows_server_2012 | — | — |
| microsoft | windows_server_2012 | >= 6.2.9200.0 < 6.2.9200.25973 | 6.2.9200.25973 |
| microsoft | windows_server_2012_r2 | >= 6.3.9600.0 < 6.3.9600.23074 | 6.3.9600.23074 |
| microsoft | windows_server_2016 | < 10.0.14393.8957 | 10.0.14393.8957 |
| microsoft | windows_server_2016 | >= 10.0.14393.0 < 10.0.14393.8957 | 10.0.14393.8957 |
| microsoft | windows_server_2019 | < 10.0.17763.8511 | 10.0.17763.8511 |
| microsoft | windows_server_2019 | >= 10.0.17763.0 < 10.0.17763.8511 | 10.0.17763.8511 |
| microsoft | windows_server_2022 | < 10.0.20348.4830 | 10.0.20348.4830 |
Detection & IOCsextracted from sources · hover to see the quote
- →Attacker sends specially crafted malformed network responses to a system running the Windows Print Spooler service, causing memory corruption in the RPC Runtime component ↗
- →Exploitation requires only low-privilege (authenticated) network access — no admin rights or user interaction needed; monitor for anomalous RPC/Print Spooler network traffic from low-privilege accounts ↗
- →Target process is the Windows Print Spooler service (spoolsv.exe); monitor for unexpected crashes, memory corruption events, or anomalous child processes spawned from spoolsv.exe following inbound RPC responses ↗
- ·No public exploit exists and exploitation is assessed as 'Less Likely' by Microsoft; EPSS probability is low (0.1%) as of publication ↗
- ·Vulnerability is a use-after-free in RPC Runtime triggered via network-delivered malformed responses, not a client-initiated request — detection logic should focus on inbound malformed RPC response traffic rather than outbound calls ↗
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_msrc8.8HIGH
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VulDB
Microsoft Windows up to Server 2025 Print Spooler use after free (Nessus ID 301780 / WID-SEC-2026-0661)
vuldb·2026-07-06·CVSS 8.8
CVE-2026-23669 [HIGH] Microsoft Windows up to Server 2025 Print Spooler use after free (Nessus ID 301780 / WID-SEC-2026-0661)
A vulnerability, which was classified as critical, has been found in Microsoft Windows. Affected by this vulnerability is an unknown functionality of the component Print Spooler. This manipulation causes use after free.
This vulnerability is tracked as CVE-2026-23669. The attack is possible to be carried out remotely. No exploit exists.
To fix this issue, it is recommended to deploy a patch.
GHSA
GHSA-9p2m-63p4-hpv7: Use after free in Windows Print Spooler Components allows an authorized attacker to execute code over a network
ghsa_unreviewed·2026-03-10
CVE-2026-23669 [HIGH] CWE-416 GHSA-9p2m-63p4-hpv7: Use after free in Windows Print Spooler Components allows an authorized attacker to execute code over a network
Use after free in Windows Print Spooler Components allows an authorized attacker to execute code over a network.
Microsoft
RPC Runtime Library Remote Code Execution Vulnerability
vendor_msrc·2026-03-10·CVSS 8.8
CVE-2026-23669 [HIGH] CWE-416 RPC Runtime Library Remote Code Execution Vulnerability
RPC Runtime Library Remote Code Execution Vulnerability
Description: Use after free in RPC Runtime allows an authorized attacker to execute code over a network.
FAQ: How could an attacker exploit this vulnerability?
An attacker could exploit this vulnerability by sending specially crafted network responses to a system running the Windows Print Spooler service. These malformed responses may cause the service to process invalid data, leading to memory corruption within the affected component. The issue requires the attacker to already have low‑privilege authentication to the target environment, and there is no indication in the provided information that user interaction is required.
FAQ: According to the CVSS metric, privileges required is low (PR:L). What does that mean for this vulnerab
No detection rules found.
No public exploits indexed.
Sophos
March Patch Tuesday visits 15 product families
blogs_sophos·2026-03-13
March Patch Tuesday visits 15 product families
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Bleepingcomputer
Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws
blogs_bleepingcomputer·2026-03-10·CVSS 8.8
[HIGH] Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws
## Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws
## Lawrence Abrams
The number of bugs in each vulnerability category is listed below:
46 Elevation of Privilege Vulnerabilities
2 Security Feature Bypass Vulnerabilities
18 Remote Code Execution Vulnerabilities
10 Information Disclosure Vulnerabilities
4 Denial of Service Vulnerabilities
4 Spoofing Vulnerabilities
When BleepingComputer reports on Patch Tuesday security updates, we only count those released by Microsoft today. Therefore, the number of flaws does not include 9 Microsoft Edge flaws, Mariner, Payment Orchestrator Service, Azure, and Microsoft Devices Pricing Program flaws fixed earlier this month.
To learn more about the non-security updates released today, you can review our dedicated articles on the
Sophos
March Patch Tuesday visits 15 product families
blogs_sophos
March Patch Tuesday visits 15 product families
Share This
Microsoft on Tuesday released 84 patches affecting 15 product families – including a few you’ve possibly never encountered. Eight of the addressed issues are considered by Microsoft to be of Critical severity, though none of those affect Windows, nor are they expected to be exploited within the next 30 days. In addition, five of those Critical issues were in fact addressed by Microsoft in advance of Patch Tuesday itself, as we’ll discuss below. Twenty-two have a CVSS base score of 8.0 or higher, including one with a 9.8 base score. None are known to be under active exploit in the wild, but two are publicly disclosed so far.
At patch time, six CVEs are judged more likely to be exploited in the next 30 days by the company’s estimation. Various of this month’s issues are amenable
Wiz
CVE-2026-23669 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 8.8
CVE-2026-23669 [HIGH] CVE-2026-23669 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-23669 :
vulnerability analysis and mitigation
Use after free in RPC Runtime allows an authorized attacker to execute code over a network.
Source : NVD
## 8.8
Score
Published March 10, 2026
Severity HIGH
CNA Score 8.8
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 22.9
Exploitation Probability (EPSS) 0.1
Sources
NVD
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## Additional
2026-03-10
Published