When Reasoning Leaks Membership: Membership Inference Attack on Black-box Large Reasoning Models.

@inproceedings{hu-2026-reasoning, author = {Ruihan Hu and Yu-Ming Shang and Wei Luo and Ye Tao and Xi Zhang}, editor = {Hakim Hacid and Yoelle Maarek and Francesco Bonchi and Ido Guy and Emine Yilmaz}, title = {{When Reasoning Leaks Membership: Membership Inference Attack on Black-box Large Reasoning Models}}, booktitle = {{Proceedings of the ACM Web Conference 2026, WWW 2026, Dubai, United Arab Emirates, originally scheduled for April 13-17, 2026, rescheduled for June 29 - July 3, 2026}}, pages = {3323--3334}, publisher = {ACM}, year = {2026}, url = {https://doi.org/10.1145/3774904.3792588}, doi = {https://doi.org/10.1145/3774904.3792588} }