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chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) #558

Closed
#559
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chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming)#558
#559
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bugSomething isn't workingpriority-normalvulnerability

Description

@moonming
moonming
opened on Jun 8, 2026

Summary

On /v1/chat/completionsstreaming, the output guardrail buffers only delta.content for the end-of-stream check_output — delta.tool_calls is never accumulated. So a blocked literal in a streamed tool-call's function.arguments bypasses the output guardrail.

This is asymmetric: chat non-streaming scans tool-call output (ChatResponse::guardrail_output_text, the #448 fix), and /v1/messagesstreaming scans them too — only chat streaming leaks.

Fix

Accumulate tool-call name + arguments from chunk.delta.tool_calls across the stream and include them in the end-of-stream synthesized ChatResponse passed to check_output (bounded to the hold-back cap; concatenated without a separator so a literal split across deltas reassembles). Under the default BufferFull policy the tool-call chunks are already held in pending, so a block holds them back (never on the wire).

Surfaced by the independent pre-fix audit of the #719 follow-up batch. Refs #719, #546, #448.

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var __re = new RegExp('^' + "github\\.com" + '
chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) · Issue #558 · api7/aisix · GitHub
      Skip to content
      chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) #558
      Closed
      #559
      Closed
      chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming)#558
      #559
      Labels
      bugSomething isn't workingpriority-normalvulnerability
      Description
      @moonming
      moonming
      opened on Jun 8, 2026
      Summary
      On /v1/chat/completionsstreaming, the output guardrail buffers only delta.content for the end-of-stream check_output — delta.tool_calls is never accumulated. So a blocked literal in a streamed tool-call's function.arguments bypasses the output guardrail.
      This is asymmetric: chat non-streaming scans tool-call output (ChatResponse::guardrail_output_text, the #448 fix), and /v1/messagesstreaming scans them too — only chat streaming leaks.
      Fix
      Accumulate tool-call name + arguments from chunk.delta.tool_calls across the stream and include them in the end-of-stream synthesized ChatResponse passed to check_output (bounded to the hold-back cap; concatenated without a separator so a literal split across deltas reassembles). Under the default BufferFull policy the tool-call chunks are already held in pending, so a block holds them back (never on the wire).
      Surfaced by the independent pre-fix audit of the #719 follow-up batch. Refs #719, #546, #448.
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chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) · Issue #558 · api7/aisix · GitHub
          Skip to content
          chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) #558
          Closed
          #559
          Closed
          chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming)#558
          #559
          Labels
          bugSomething isn't workingpriority-normalvulnerability
          Description
          @moonming
          moonming
          opened on Jun 8, 2026
          Summary
          On /v1/chat/completionsstreaming, the output guardrail buffers only delta.content for the end-of-stream check_output — delta.tool_calls is never accumulated. So a blocked literal in a streamed tool-call's function.arguments bypasses the output guardrail.
          This is asymmetric: chat non-streaming scans tool-call output (ChatResponse::guardrail_output_text, the #448 fix), and /v1/messagesstreaming scans them too — only chat streaming leaks.
          Fix
          Accumulate tool-call name + arguments from chunk.delta.tool_calls across the stream and include them in the end-of-stream synthesized ChatResponse passed to check_output (bounded to the hold-back cap; concatenated without a separator so a literal split across deltas reassembles). Under the default BufferFull policy the tool-call chunks are already held in pending, so a block holds them back (never on the wire).
          Surfaced by the independent pre-fix audit of the #719 follow-up batch. Refs #719, #546, #448.
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) · Issue #558 · api7/aisix · GitHub
              Skip to content
              chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) #558
              Closed
              #559
              Closed
              chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming)#558
              #559
              Labels
              bugSomething isn't workingpriority-normalvulnerability
              Description
              @moonming
              moonming
              opened on Jun 8, 2026
              Summary
              On /v1/chat/completionsstreaming, the output guardrail buffers only delta.content for the end-of-stream check_output — delta.tool_calls is never accumulated. So a blocked literal in a streamed tool-call's function.arguments bypasses the output guardrail.
              This is asymmetric: chat non-streaming scans tool-call output (ChatResponse::guardrail_output_text, the #448 fix), and /v1/messagesstreaming scans them too — only chat streaming leaks.
              Fix
              Accumulate tool-call name + arguments from chunk.delta.tool_calls across the stream and include them in the end-of-stream synthesized ChatResponse passed to check_output (bounded to the hold-back cap; concatenated without a separator so a literal split across deltas reassembles). Under the default BufferFull policy the tool-call chunks are already held in pending, so a block holds them back (never on the wire).
              Surfaced by the independent pre-fix audit of the #719 follow-up batch. Refs #719, #546, #448.
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, 'i');
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var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) · Issue #558 · api7/aisix · GitHub
                  Skip to content
                  chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) #558
                  Closed
                  #559
                  Closed
                  chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming)#558
                  #559
                  Labels
                  bugSomething isn't workingpriority-normalvulnerability
                  Description
                  @moonming
                  moonming
                  opened on Jun 8, 2026
                  Summary
                  On /v1/chat/completionsstreaming, the output guardrail buffers only delta.content for the end-of-stream check_output — delta.tool_calls is never accumulated. So a blocked literal in a streamed tool-call's function.arguments bypasses the output guardrail.
                  This is asymmetric: chat non-streaming scans tool-call output (ChatResponse::guardrail_output_text, the #448 fix), and /v1/messagesstreaming scans them too — only chat streaming leaks.
                  Fix
                  Accumulate tool-call name + arguments from chunk.delta.tool_calls across the stream and include them in the end-of-stream synthesized ChatResponse passed to check_output (bounded to the hold-back cap; concatenated without a separator so a literal split across deltas reassembles). Under the default BufferFull policy the tool-call chunks are already held in pending, so a block holds them back (never on the wire).
                  Surfaced by the independent pre-fix audit of the #719 follow-up batch. Refs #719, #546, #448.
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) · Issue #558 · api7/aisix · GitHub
                      Skip to content
                      chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) #558
                      Closed
                      #559
                      Closed
                      chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming)#558
                      #559
                      Labels
                      bugSomething isn't workingpriority-normalvulnerability
                      Description
                      @moonming
                      moonming
                      opened on Jun 8, 2026
                      Summary
                      On /v1/chat/completionsstreaming, the output guardrail buffers only delta.content for the end-of-stream check_output — delta.tool_calls is never accumulated. So a blocked literal in a streamed tool-call's function.arguments bypasses the output guardrail.
                      This is asymmetric: chat non-streaming scans tool-call output (ChatResponse::guardrail_output_text, the #448 fix), and /v1/messagesstreaming scans them too — only chat streaming leaks.
                      Fix
                      Accumulate tool-call name + arguments from chunk.delta.tool_calls across the stream and include them in the end-of-stream synthesized ChatResponse passed to check_output (bounded to the hold-back cap; concatenated without a separator so a literal split across deltas reassembles). Under the default BufferFull policy the tool-call chunks are already held in pending, so a block holds them back (never on the wire).
                      Surfaced by the independent pre-fix audit of the #719 follow-up batch. Refs #719, #546, #448.
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                          No branches or pull requests
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try {
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var __re = new RegExp('^' + ".*" + '
chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) · Issue #558 · api7/aisix · GitHub
                          Skip to content
                          chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) #558
                          Closed
                          #559
                          Closed
                          chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming)#558
                          #559
                          Labels
                          bugSomething isn't workingpriority-normalvulnerability
                          Description
                          @moonming
                          moonming
                          opened on Jun 8, 2026
                          Summary
                          On /v1/chat/completionsstreaming, the output guardrail buffers only delta.content for the end-of-stream check_output — delta.tool_calls is never accumulated. So a blocked literal in a streamed tool-call's function.arguments bypasses the output guardrail.
                          This is asymmetric: chat non-streaming scans tool-call output (ChatResponse::guardrail_output_text, the #448 fix), and /v1/messagesstreaming scans them too — only chat streaming leaks.
                          Fix
                          Accumulate tool-call name + arguments from chunk.delta.tool_calls across the stream and include them in the end-of-stream synthesized ChatResponse passed to check_output (bounded to the hold-back cap; concatenated without a separator so a literal split across deltas reassembles). Under the default BufferFull policy the tool-call chunks are already held in pending, so a block holds them back (never on the wire).
                          Surfaced by the independent pre-fix audit of the #719 follow-up batch. Refs #719, #546, #448.
                          Metadata
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
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function applyDarkMode() {
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console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
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chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) · Issue #558 · api7/aisix · GitHub
                              Skip to content
                              chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming) #558
                              Closed
                              #559
                              Closed
                              chat.rs streaming output guardrail doesn't scan tool-call args (#448 leak on streaming)#558
                              #559
                              Labels
                              bugSomething isn't workingpriority-normalvulnerability
                              Description
                              @moonming
                              moonming
                              opened on Jun 8, 2026
                              Summary
                              On /v1/chat/completionsstreaming, the output guardrail buffers only delta.content for the end-of-stream check_output — delta.tool_calls is never accumulated. So a blocked literal in a streamed tool-call's function.arguments bypasses the output guardrail.
                              This is asymmetric: chat non-streaming scans tool-call output (ChatResponse::guardrail_output_text, the #448 fix), and /v1/messagesstreaming scans them too — only chat streaming leaks.
                              Fix
                              Accumulate tool-call name + arguments from chunk.delta.tool_calls across the stream and include them in the end-of-stream synthesized ChatResponse passed to check_output (bounded to the hold-back cap; concatenated without a separator so a literal split across deltas reassembles). Under the default BufferFull policy the tool-call chunks are already held in pending, so a block holds them back (never on the wire).
                              Surfaced by the independent pre-fix audit of the #719 follow-up batch. Refs #719, #546, #448.
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                              Assignees
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                                bugSomething isn't workingpriority-normalvulnerability
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