Trail of Bits disclosed a selective-abort vulnerability in an OT-based threshold-ECDSA implementation in the Doerner et al. (DKLS) line. Whether the OT-extension consistency check aborts is itself a function of the sender’s secret choice bits, so a cheating receiver learns “a few bits” per run from the pass/abort signal; because the base OTs are reused, repeating it recovers every secret bit, and in a two-party setting the nonce and the ECDSA signing key.
The fix is to “throw away the setup for a participant that has attempted to cheat during the OT extension protocol.”