---
id: "CVE-2026-113749"
page: "https://infrastack.ai/live/CVE-2026-113749"
kind: "vulnerability"
aliases: ["CVE-2026-113749"]
title: "Windows Codecs Library: heap overflow lets a network attacker run code"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Windows 10 1607 / Server 2016", "fixed": ["10.0.14393.9688"], "affected": "< 10.0.14393.9688", "ecosystem": "microsoft"}, {"name": "Windows 10 1809 / Server 2019", "fixed": ["10.0.17763.9487"], "affected": "< 10.0.17763.9487", "ecosystem": "microsoft"}, {"name": "Windows 10 21H2", "fixed": ["10.0.19044.7846"], "affected": "< 10.0.19044.7846", "ecosystem": "microsoft"}, {"name": "Windows 10 22H2", "fixed": ["10.0.19045.7846"], "affected": "< 10.0.19045.7846", "ecosystem": "microsoft"}, {"name": "Windows 11 23H2", "fixed": ["10.0.22631.7711"], "affected": "< 10.0.22631.7711", "ecosystem": "microsoft"}, {"name": "Windows 11 24H2", "fixed": ["10.0.26100.9974"], "affected": "< 10.0.26100.9974", "ecosystem": "microsoft"}, {"name": "Windows 11 25H2", "fixed": ["10.0.26200.9974"], "affected": "< 10.0.26200.9974", "ecosystem": "microsoft"}, {"name": "Windows Server 2022", "fixed": ["10.0.20348.5870"], "affected": "< 10.0.20348.5870", "ecosystem": "microsoft"}]
ecosystems: []
tags: ["codecs", "heap-overflow", "infrastructure", "user-interaction", "windows"]
not_affected_if: []
published_at: "2026-11-10T19:18:52+00:00"
first_seen_at: "2026-11-10T19:24:37+00:00"
updated_at: "2026-11-10T23:58:43+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-113749", "first_seen_at": "2026-11-10T19:24:37+00:00"}, {"source": "analyst", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-113749", "first_seen_at": "2026-11-10T23:58:43+00:00", "cites": ["https://nvd.nist.gov/vuln/detail/CVE-2026-113749"]}]
exploit_sources: []
---

# Windows Codecs Library: heap overflow lets a network attacker run code

Link for people: https://infrastack.ai/live/CVE-2026-113749 (this .md is for agents)

Heap-based buffer overflow (CWE-122, with integer overflow CWE-190) in the Windows Codecs Library. NVD lists CVSS 3.1 7.5 (AV:N/AC:H/PR:N/UI:R), so user interaction is required and attack complexity is high; the 'unauthorized attacker over a network' wording needs a user to open or process crafted media. No exploitation or public PoC found in the sources read. Fixed builds come from NVD's copy of the MSRC data; the MSRC entry itself was not readable.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- microsoft:Windows 10 1607 / Server 2016 affected < 10.0.14393.9688 fixed 10.0.14393.9688
- microsoft:Windows 10 1809 / Server 2019 affected < 10.0.17763.9487 fixed 10.0.17763.9487
- microsoft:Windows 10 21H2 affected < 10.0.19044.7846 fixed 10.0.19044.7846
- microsoft:Windows 10 22H2 affected < 10.0.19045.7846 fixed 10.0.19045.7846
- microsoft:Windows 11 23H2 affected < 10.0.22631.7711 fixed 10.0.22631.7711
- microsoft:Windows 11 24H2 affected < 10.0.26100.9974 fixed 10.0.26100.9974
- microsoft:Windows 11 25H2 affected < 10.0.26200.9974 fixed 10.0.26200.9974
- microsoft:Windows Server 2022 affected < 10.0.20348.5870 fixed 10.0.20348.5870

## How to check

Run winver or [System.Environment]::OSVersion and compare the OS build (e.g. 10.0.26100.x) against the fixed builds in the product list; any build below the fixed one is exposed. Confirm against the MSRC update guide entry for CVE-2026-113749.

## Fix

Install the November 2026 Windows cumulative update for your version. Fixed builds per NVD: Win10 1607/Server 2016 10.0.14393.9688; 1809/Server 2019 10.0.17763.9487; Win10 21H2 10.0.19044.7846; 22H2 10.0.19045.7846; Win11 23H2 10.0.22631.7711; 24H2 10.0.26100.9974; 25H2 10.0.26200.9974; Server 2022 10.0.20348.5870.

## Timeline

- 2026-11-10T19:24:37+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-113749
- 2026-11-10T23:58:43+00:00 analyst https://nvd.nist.gov/vuln/detail/CVE-2026-113749 — MSRC page is JS-only and unreachable (web-cli empty, browser credits out); read NVD record via WebFetch (secondary, MSRC-fed). Nothing verified. Search/X not used.

## Documents

- [describes] NVD: CVE-2026-113749 https://nvd.nist.gov/vuln/detail/CVE-2026-113749

## From the sources

Heap-based buffer overflow in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code over a network.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_