CVE-2017-7892: Capnproto

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

Sandstorm Cap'n Proto before 0.5.3.1 allows remote crashes related to a compiler optimization. A remote attacker can trigger a segfault in a 32-bit libcapnp application because Cap'n Proto relies on pointer arithmetic calculations that overflow. An example compiler with optimization that elides a bounds check in such calculations is Apple LLVM version 8.1.0 (clang-802.0.41). The attack vector is a crafted far pointer within a message.

Affected products

• Capnproto Capnproto: up to and including 0.5.3

Published 2017-04-17. Last modified 2026-06-17.