CVE-2026-32149
published 2026-04-14CVE-2026-32149: Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.
PriorityP342high7.3CVSS 3.1
AVLACLPRLUIRSUCHIHAH
EPSS
0.43%
34.8th percentile
Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.
Affected
26 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_10_1607 | < 10.0.14393.9060 | 10.0.14393.9060 |
| microsoft | windows_10_1809 | < 10.0.17763.8644 | 10.0.17763.8644 |
| microsoft | windows_10_21h2 | < 10.0.19044.7184 | 10.0.19044.7184 |
| microsoft | windows_10_22h2 | < 10.0.19045.7184 | 10.0.19045.7184 |
| microsoft | windows_10_version_1607 | >= 10.0.14393.0 < 10.0.14393.9060 | 10.0.14393.9060 |
| microsoft | windows_10_version_1809 | >= 10.0.17763.0 < 10.0.17763.8644 | 10.0.17763.8644 |
| microsoft | windows_10_version_21h2 | >= 10.0.19044.0 < 10.0.19044.7184 | 10.0.19044.7184 |
| microsoft | windows_10_version_22h2 | >= 10.0.19045.0 < 10.0.19045.7184 | 10.0.19045.7184 |
| microsoft | windows_11_23h2 | < 10.0.22631.6936 | 10.0.22631.6936 |
| microsoft | windows_11_24h2 | < 10.0.26100.8246 | 10.0.26100.8246 |
| microsoft | windows_11_25h2 | < 10.0.26200.8246 | 10.0.26200.8246 |
| microsoft | windows_11_26h1 | < 10.0.28000.1836 | 10.0.28000.1836 |
| microsoft | windows_11_version_22h3 | >= 10.0.22631.0 < 10.0.22631.6936 | 10.0.22631.6936 |
| microsoft | windows_11_version_23h2 | >= 10.0.22631.0 < 10.0.22631.6936 | 10.0.22631.6936 |
| microsoft | windows_11_version_24h2 | >= 10.0.26100.0 < 10.0.26100.8246 | 10.0.26100.8246 |
| microsoft | windows_11_version_25h2 | >= 10.0.26200.0 < 10.0.26200.8246 | 10.0.26200.8246 |
| microsoft | windows_11_version_26h1 | >= 10.0.28000.0 < 10.0.28000.1836 | 10.0.28000.1836 |
| microsoft | windows_server_2016 | < 10.0.14393.9060 | 10.0.14393.9060 |
| microsoft | windows_server_2016 | >= 10.0.14393.0 < 10.0.14393.9060 | 10.0.14393.9060 |
| microsoft | windows_server_2019 | < 10.0.17763.8644 | 10.0.17763.8644 |
| microsoft | windows_server_2019 | >= 10.0.17763.0 < 10.0.17763.8644 | 10.0.17763.8644 |
| microsoft | windows_server_2022 | < 10.0.20348.5020 | 10.0.20348.5020 |
| microsoft | windows_server_2022 | >= 10.0.20348.0 < 10.0.20348.5020 | 10.0.20348.5020 |
| microsoft | windows_server_2022_23h2 | < 10.0.25398.2274 | 10.0.25398.2274 |
| microsoft | windows_server_2025 | < 10.0.26100.32690 | 10.0.26100.32690 |
CVSS provenance
nvdv3.17.3HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
ghsa7.5HIGH
vendor_redhat7.5HIGH
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GHSA
nginx ignition has ParseAcceptLanguage `_` separator bypass that enables ~75x CPU amplification via Accept-Language header in i18nMiddleware
ghsa·2026-09-21·CVSS 7.5
CVE-2026-61629 [HIGH] CWE-770 nginx ignition has ParseAcceptLanguage `_` separator bypass that enables ~75x CPU amplification via Accept-Language header in i18nMiddleware
nginx ignition has ParseAcceptLanguage `_` separator bypass that enables ~75x CPU amplification via Accept-Language header in i18nMiddleware
### Summary
The gin i18n middleware in nginx-ignition's API server runs in front of every HTTP request and calls `golang.org/x/text/language.ParseAcceptLanguage` on the raw `Accept-Language` header without imposing any size or shape filter. The underlying parser has quadratic-time behaviour on long lists of malformed language tags. The CVE-2022-32149 guard that golang.org/x/text added in v0.3.8 caps the number of `-` characters in the input at 1000, but it does not cap `_` characters even though the parser's internal scanner aliases `_` to `-` before parsing. A single unauthenticated GET request with an `Accept-Language` header built out of `_` sepa
VulDB
Microsoft Windows up to Server 2025 Hyper-V input validation
vuldb·2026-04-14·CVSS 7.3
CVE-2026-32149 [HIGH] Microsoft Windows up to Server 2025 Hyper-V input validation
A vulnerability has been found in Microsoft Windows and classified as critical. Affected by this issue is some unknown functionality of the component Hyper-V. The manipulation leads to improper input validation.
This vulnerability is traded as CVE-2026-32149. An attack has to be approached locally. There is no exploit available.
The affected component should be upgraded.
GHSA
GHSA-rg3f-46g9-qwc9: Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally
ghsa_unreviewed·2026-04-14
CVE-2026-32149 [HIGH] CWE-20 GHSA-rg3f-46g9-qwc9: Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally
Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally.
Red Hat
openshift/oauth-server: openshift/oauth-server: Quadratic-time DoS via Accept-Language header underscore bypass on unauthenticated login endpoints
vendor_redhat·2026-08-31·CVSS 7.5
CVE-2026-49329 [HIGH] CWE-407 openshift/oauth-server: openshift/oauth-server: Quadratic-time DoS via Accept-Language header underscore bypass on unauthenticated login endpoints
openshift/oauth-server: openshift/oauth-server: Quadratic-time DoS via Accept-Language header underscore bypass on unauthenticated login endpoints
A flaw was found in openshift/oauth-server. The OAuth login and error page endpoints pass the unauthenticated Accept-Language header to golang.org/x/text/language.ParseAcceptLanguage() without input validation. A bypass of the CVE-2022-32149 mitigation exists: the upstream guard counts only '-' characters but the internal BCP 47 scanner aliases '_' to '-' after the guard check. An unauthenticated attacker can send a crafted Accept-Language header using '_' separators to trigger quadratic-time parsing, consuming excessive CPU and denying authentication to all cluster users.
Statement: This is an Important denial of service vulnerability in Open
No detection rules found.
No public exploits indexed.
Bleepingcomputer
Microsoft April 2026 Patch Tuesday fixes 167 flaws, 2 zero-days
blogs_bleepingcomputer·2026-04-14·CVSS 6.5
[MEDIUM] Microsoft April 2026 Patch Tuesday fixes 167 flaws, 2 zero-days
## Microsoft April 2026 Patch Tuesday fixes 167 flaws, 2 zero-days
## Lawrence Abrams
Today is Microsoft's April 2026 Patch Tuesday with security updates for 167 flaws, including 2 zero-day vulnerabilities.
This Patch Tuesday also addresses eight "Critical" vulnerabilities, 7 of which are remote code execution flaws and the other is a denial of service flaw.
The number of bugs in each vulnerability category is listed below:
93 Elevation of Privilege Vulnerabilities
13 Security Feature Bypass Vulnerabilities
20 Remote Code Execution Vulnerabilities
21 Information Disclosure Vulnerabilities
10 Denial of Service Vulnerabilities
9 Spoofing Vulnerabilities
When BleepingComputer reports on Patch Tuesday security updates, we only count those released by Microsoft today.
Therefore, the
Sans Isc
Microsoft Patch Tuesday April 2026., (Tue, Apr 14th)
blogs_sans_isc·2026-04-14·CVSS 8.8
[HIGH] Microsoft Patch Tuesday April 2026., (Tue, Apr 14th)
Microsoft Patch Tuesday April 2026.
Published: 2026-04-14. Last Updated: 2026-04-14 17:46:09 UTC
by Johannes Ullrich (Version: 1)
0 comment(s)
This month's Microsoft Patch Tuesday looks like a record one, but let's look at it a bit closer to understand what is happening
The update patches a total of 243 vulnerabilities. However, 78 of them are Chromium issues affecting Microsoft Edge. Patches for Edge were released earlier. This leaves 165 vulnerabilities that are not Edge-related. Of these, 8 are rated critical, and 154 are important. One vulnerability has already been exploited, and another was made public before today but has not yet been seen in the wild.
Noteworthy Vulnerabilities:
CVE-2026-33827 (Windows TCP/IP Remote Code Execution Vulnerability): As a packet nerd, I love thes
Rapid7
Patch Tuesday - April 2026
blogs_rapid7·2026-04-14·CVSS 6.5
[MEDIUM] Patch Tuesday - April 2026
Microsoft is publishing 167 vulnerabilities on April 2026 Patch Tuesday . Microsoft is aware of exploitation in the wild for one of today’s vulnerabilities, and public disclosure for one other. Microsoft evaluates 19 of the vulnerabilities published today as more likely to see future exploitation. So far this month, Microsoft has provided patches to address 80 browser vulnerabilities, which are not included in the Patch Tuesday count above.
## Increasing volumes of vulnerabilities
Regular Patch Tuesday watchers will know that these vulnerability totals are significantly higher than usual, especially the browser numbers. Late last week, Microsoft published patches to resolve more than 60 browser vulnerabilities in a single day, which is a new record in that very specific category.
It mig
Bugzilla
CVE-2026-49329 openshift/oauth-server: openshift/oauth-server: Quadratic-time DoS via Accept-Language header underscore bypass on unauthenticated login endpoints
bugzilla·2026-05-29·CVSS 7.5
CVE-2026-49329 [HIGH] CVE-2026-49329 openshift/oauth-server: openshift/oauth-server: Quadratic-time DoS via Accept-Language header underscore bypass on unauthenticated login endpoints
CVE-2026-49329 openshift/oauth-server: openshift/oauth-server: Quadratic-time DoS via Accept-Language header underscore bypass on unauthenticated login endpoints
The getPreferredLang() function in pkg/server/locales/locales.go passes the raw Accept-Language header into golang.org/x/text/language.ParseAcceptLanguage() without input validation. The upstream CVE-2022-32149 mitigation counts only '-' characters (capped at 1000) but the BCP 47 scanner aliases '_' to '-' internally after the guard check. A 1 MiB Accept-Language header using '_' separators bypasses the guard, triggering quadratic-time parsing (~1 second CPU per request on Apple M1 Pro). The affected endpoints (/login, /oauth/authorize/error) are unauthenticated. The OAuth route uses TLS passthrough (termination: passthrough), so
2026-04-14
Published