EUVD-2026-100374
GHSA-rwrf-fc4p-qjq7
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessDeliver crafted document or font
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DeliveryVictim opens or renders content
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ExploitTrigger out-of-bounds read in text shaping
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ExecutionLeverage memory corruption for code execution
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ImpactRun attacker code in user context
Vulnerability Assessment
| Weakness |
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Bounds checking, read limits
MITRE ATT&CK
1 technique across 1 tactic: Collection The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | Exploitation requires the victim to open or render attacker-controlled content (UI:R) - a malicious document, web page, email, or font processed by the Windows Text Shaping component - so it is not wormable or zero-click against default configurations. No authentication is required (PR:N) and the attack is network-deliverable (AV:N), meaning any Windows system that renders untrusted text/font content is in scope; the primary limiting factor is the needed user interaction, with no special non-default configuration indicated. |
| Impact | This is a credible high-priority issue but not a top-of-queue emergency on current signals. The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H, base 8.8) describes network-reachable, unauthenticated code execution with high confidentiality, integrity, and availability impact, tempered only by the required user interaction (UI:R). Notably, the CWE is CWE-125 (out-of-bounds read) and the description says 'execute code over a network' - an OOB read yielding full RCE usually implies the read enables memory disclosure/corruption primitives or ASLR defeat chained to code execution, which is plausible for a font/text-shaping engine but worth noting as a slightly unusual mapping (verify exploitation mechanics with Microsoft). On real-world exploitation signals, there is no EPSS score, no CISA KEV listing, and no public POC in the provided data, so there is no evidence of active exploitation - the elevated priority rests on severity and ubiquity, not on observed attacks. Net: treat as an important patch-cycle item for a ubiquitous Windows component, but absence of KEV/EPSS/POC means it is a high-CVSS issue without (yet) confirmed real-world exploitation pressure. |
| Exploit ScenarioDerived | An attacker crafts a malicious document, web page, or font file containing specially shaped text that triggers the out-of-bounds read in the Windows Text Shaping component when rendered. A victim opens the file or visits the page (UI:R), and the memory-safety flaw is leveraged to execute arbitrary code in the victim's context. No public exploit code was identified at time of analysis. |
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Alert meAnalysisAIv1 – Oct 13, 2026
Out-of-bounds read in Windows Text Shaping allows a remote, unauthenticated attacker to execute code on affected Windows systems when a victim opens or renders attacker-controlled content (UI:R), such as a document, web page, email, or font. No public exploit code has been identified at time of analysis, and the vulnerability is not listed in CISA KEV, but with a CVSS score of 8.8 and high impact to confidentiality, integrity, and availability, it represents a credible high-priority risk that is not a top-of-queue emergency on current signals.
RemediationAI
No vendor-released patch identified at time of analysis; monitor the Microsoft MSRC update guide (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-102225) for the official fix and apply it as soon as it is available. In the interim, reduce the attack surface by enabling the 'Block untrusted fonts' policy in Windows (Computer Configuration > Administrative Templates > System > Mitigation Options > Untrusted Font Blocking), which prevents applications from loading non-system fonts; note that this may break applications that rely on custom fonts, so test compatibility first. Disable font preview in File Explorer (View > Options > View tab > uncheck 'Show preview handlers in preview pane' and 'Display file icon on thumbnails') to avoid automatic rendering of untrusted fonts. For email and web browsing, ensure Microsoft Defender Application Guard or similar sandboxing is enabled, and enforce Protected View in Microsoft Office for documents from untrusted sources. These measures may introduce user friction and compatibility issues but significantly reduce the likelihood of successful exploitation until a patch is released.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 20 packages in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
The vulnerability resides in the Windows Text Shaping component, which is responsible for processing and rendering text and fonts across the operating system. CWE-125 (Out-of-bounds Read) indicates that the component fails to properly validate the length or boundaries of text/font data, leading to a read past the end of an allocated memory buffer. While out-of-bounds reads typically result in information disclosure, the provided CVSS vector (C:H/I:H/A:H) suggests that the memory corruption may be leveraged to achieve code execution, potentially through subsequent exploitation of leaked memory or by triggering a more severe memory safety violation. Tags associated with this CVE include Buffer Overflow, Information Disclosure, and Microsoft. The attack is network-deliverable (AV:N) and requires no privileges (PR:N), but successful exploitation hinges on user interaction (UI:R) - the victim must open or view malicious content that is processed by the text shaping engine. Microsoft's MSRC update guide is the authoritative source for affected product versions and patch information.
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network-delivered content rendered by a core OS component with no privileges but requiring the victim to open it (UI:R); successful code execution yields full C/I/A impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Out-of-bounds read in Windows Text Shaping allows an unauthorized attacker to execute code over a network.
Executive ViewAI
A high-severity vulnerability (CVE-2026-102225, CVSS 8.8) in Windows Text Shaping enables remote code execution on affected Windows systems when a user opens or renders malicious content, such as a document, web page, email, or font. With no public exploit identified at time of analysis, the risk is still significant due to the high impact on confidentiality, integrity, and availability, affecting any organization using Windows endpoints. Leadership should prioritize identifying and mitigating this threat, as successful exploitation could lead to widespread system compromise and data loss.
No vendor-released patch identified at time of analysis. Based on the described attack vector, interim mitigations include restricting the rendering of untrusted content (e.g., documents, web pages, emails, fonts) and implementing application whitelisting.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.
Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.
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