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compaction smuggling
also context compaction smuggling
Definition of compaction smuggling
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: an attack that steers an AI system's context-compaction step to encode protected information, such as a model's hidden reasoning, inside a portable compacted context so that another model or later step can reproduce the information
- The researchers used compaction smuggling to move a reasoning trace past a safeguard that blocked direct cross-model replay.
- A provider fixed the demonstrated compaction-smuggling path after the compaction service was shown to act like a decryption oracle.
Origin & history
Security researchers at Xint introduced the name compaction smuggling in October 2026 for a technique that used an AI API's context-compaction feature to move protected reasoning between models. The reported demonstration bypassed mitigations added after earlier reasoning-trace extraction research.
Editorial references
Sources & further reading
- Stealing OpenAI Reasoning Traces via Compaction Smuggling↗ Xint · 2026-10-26
- OpenAI's August fix for theft of reasoning traces was quickly bypassed↗ CSO Online · 2026-10-26
- OpenAI Compaction Flaw Let Researchers Bypass Hidden Reasoning Protections↗ The Hacker News · 2026-10-27
Test yourself
Which of these is the meaning of compaction smuggling?
Cite this entry
"Compaction smuggling." AI Dictionary, Dadgogo, https://dadgogo.com/dictionary/compaction-smuggling/. Accessed 28 Oct. 2026.