[CVE-2025-55163] HIGH: grpc-netty-shaded / netty-codec-http2 - HTTP/2 DDoS vulnerability

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
42/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
grpc, java
Domain
networking, security

Research direction

Start by locating the dependency declarations used to build workers.jar and compare grpc-netty-shaded and netty-codec-http2 with the fixed versions listed in the report. Check the NVD reference and rerun the container vulnerability scan; done means the vulnerable versions are no longer present.

Written by the indexing model from the issue text.

Description

security vulnerability

Vulnerability Report

Field Value
CVE CVE-2025-55163
Severity HIGH
Libraries io.grpc:grpc-netty-shaded (1.70.0), io.netty:netty-codec-http2 (4.1.118.Final)
Source workers.jar
Fixed Versions grpc-netty-shaded 1.75.0, netty-codec-http2 4.2.4.Final / 4.1.124.Final
Summary

Netty MadeYouReset HTTP/2 DDoS Vulnerability - affects both grpc-netty-shaded and netty-codec-http2.

References

Filed from container vulnerability scan of workers.jar

Dominant language
Java
Stars
12
Forks
10
Avg merge
1d 10h
Merged PRs (30d)
2

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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