diff --git a/requirements/build.txt b/requirements/build.txt
index 0d3a24dd1ca3..a239ed10af1b 100644
--- a/requirements/build.txt
+++ b/requirements/build.txt
@@ -9,5 +9,5 @@ wheel
 jinja2>=3.1.6
 regex
 build
-protobuf
+protobuf >= 6.33.5
 grpcio-tools
diff --git a/requirements/common.txt b/requirements/common.txt
index 5c5df38f8e06..c0d08a802f48 100644
--- a/requirements/common.txt
+++ b/requirements/common.txt
@@ -9,7 +9,7 @@ blake3
 py-cpuinfo
 transformers >= 4.56.0, < 5
 tokenizers >= 0.21.1  # Required for fast incremental detokenization.
-protobuf # Required by LlamaTokenizer, gRPC.
+protobuf >= 6.33.5 # Required by LlamaTokenizer, gRPC. CVE-2026-0994
 fastapi[standard] >= 0.115.0 # Required by FastAPI's form models in the OpenAI API server's audio transcriptions endpoint.
 aiohttp
 openai >= 1.99.1  # For Responses API with reasoning content