From b55c09d6fa13d34ca1ff5a02e6a0f559150be2b5 Mon Sep 17 00:00:00 2001
From: Kartik Chilkoti <chilkotikartik@gmail.com>
Date: Wed, 16 Sep 2026 17:04:18 +0530
Subject: [PATCH] fix(proxy): add safe header sanitization and null key/val
 guards [skip ci]

---
 litellm/proxy/utils/header_sanitizer.py | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 litellm/proxy/utils/header_sanitizer.py

diff --git a/litellm/proxy/utils/header_sanitizer.py b/litellm/proxy/utils/header_sanitizer.py
new file mode 100644
index 00000000000..eac87d68d1b
--- /dev/null
+++ b/litellm/proxy/utils/header_sanitizer.py
@@ -0,0 +1,20 @@
+\"\"\"
+Header sanitization and guard utilities for LiteLLM proxy authentication forwarding.
+\"\"\"
+from typing import Dict, Any, Optional
+
+def sanitize_proxy_headers(headers: Optional[Dict[str, Any]]) -> Dict[str, str]:
+    if not headers:
+        return {}
+    
+    sanitized: Dict[str, str] = {}
+    for k, v in headers.items():
+        if k is None:
+            continue
+        key_str = str(k).strip()
+        if not key_str:
+            continue
+        val_str = "" if v is None else str(v).strip()
+        sanitized[key_str] = val_str
+        
+    return sanitized
\ No newline at end of file