PuTTY 0.71 before 0.84 has an assertion failure in ECDSA signature verification.Referenceshttps://lists.tartarus.org/pipermail/putty-announce/2026/000042.htmlhttps://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/ecdsa-remotely-triggerable-assertion.html
