CVE-2026-88389

Espruino 2v29 (commit bffc6d0) contains a NULL pointer dereference vulnerability in jslGetRawString() in src/jslex.c. Crafted raw/binary string input can cause the lexer to pass a NULL iterator target to jsvLockAgain(). In RELEASE/NO_ASSERT builds, the missing assertion guard allows a write through the NULL pointer, resulting in memory corruption and application termination or denial of service.

  • Published Sep 25, 2026
  • CVSS 6.2 medium
  • 0.1% chance of exploitation in the next 30 days (EPSS)
  • A fix is available

CVE-2026-88389 at the National Vulnerability Database