CVE-2025-43855
published 2025-04-24CVE-2025-43855: tRPC allows users to build & consume fully typesafe APIs without schemas or code generation. In versions starting from 11.0.0 to before 11.1.1, an unhandled…
PriorityP352high8.7CVSS 4.0
AVNACLATNPRNUINVCNVINVAHSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.35%
26.8th percentile
tRPC allows users to build & consume fully typesafe APIs without schemas or code generation. In versions starting from 11.0.0 to before 11.1.1, an unhandled error is thrown when validating invalid connectionParams which crashes a tRPC WebSocket server. This allows any unauthenticated user to crash a tRPC 11 WebSocket server. Any tRPC 11 server with WebSocket enabled with a createContext method set is vulnerable. This issue has been patched in version 11.1.1.
Affected
10 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| msrc | azl3_kernel_6.6.43.1-7_on_azure_linux_3.0 | — | — |
| msrc | azl3_kernel_6.6.47.1-1_on_azure_linux_3.0 | — | — |
| msrc | azure_linux_3.0_arm | — | — |
| msrc | azure_linux_3.0_x64 | — | — |
| msrc | cbl2_kernel_5.15.167.1-1_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_kernel_5.15.182.1-1_on_cbl_mariner_2.0 | — | — |
| msrc | cbl_mariner_2.0_arm | — | — |
| msrc | cbl_mariner_2.0_x64 | — | — |
| trpc | server | >= 11.0.0 < 11.1.1 | 11.1.1 |
| trpc | trpc | — | — |
CVSS provenance
nvdv4.08.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_msrc5.5MEDIUM
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OSV
tRPC 11 WebSocket DoS Vulnerability
osv·2025-04-24
CVE-2025-43855 [HIGH] tRPC 11 WebSocket DoS Vulnerability
tRPC 11 WebSocket DoS Vulnerability
### Summary
An unhandled error is thrown when validating invalid connectionParams which crashes a tRPC WebSocket server. This allows any unauthenticated user to crash a tRPC 11 WebSocket server.
### Details
Any tRPC 11 server with WebSocket enabled with a `createContext` method set is vulnerable. Here is an example:
https://github.com/user-attachments/assets/ce1b2d32-6103-4e54-8446-51535b293b05
I have a working reproduction here if you would like to test: https://github.com/lukechilds/trpc-vuln-reproduction
The connectionParams logic introduced in https://github.com/trpc/trpc/pull/5839 does not safely handle invalid connectionParams objects. During validation if the object does not match an expected shape an error will be thrown:
https://github.co
GHSA
tRPC 11 WebSocket DoS Vulnerability
ghsa·2025-04-24
CVE-2025-43855 [HIGH] CWE-248 tRPC 11 WebSocket DoS Vulnerability
tRPC 11 WebSocket DoS Vulnerability
### Summary
An unhandled error is thrown when validating invalid connectionParams which crashes a tRPC WebSocket server. This allows any unauthenticated user to crash a tRPC 11 WebSocket server.
### Details
Any tRPC 11 server with WebSocket enabled with a `createContext` method set is vulnerable. Here is an example:
https://github.com/user-attachments/assets/ce1b2d32-6103-4e54-8446-51535b293b05
I have a working reproduction here if you would like to test: https://github.com/lukechilds/trpc-vuln-reproduction
The connectionParams logic introduced in https://github.com/trpc/trpc/pull/5839 does not safely handle invalid connectionParams objects. During validation if the object does not match an expected shape an error will be thrown:
https://github.co
Microsoft
md: fix deadlock between mddev_suspend and flush bio
vendor_msrc·2024-08-13·CVSS 5.5
CVE-2024-43855 [MEDIUM] CWE-476 md: fix deadlock between mddev_suspend and flush bio
md: fix deadlock between mddev_suspend and flush bio
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
Linux: Linux
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://learn.mi
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2025-04-24
Published