CVE-2026-88389
UnknownSummary
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(), leading to memory corruption and application termination or denial of service in RELEASE/NO_ASSERT builds.
Risk Assessment
The risk includes potential application crashes or denial of service via specially crafted input, affecting system availability.
Recommendation
Upgrade Espruino to the latest version or apply patches if available, and avoid processing untrusted input.
Other vulnerabilities in Espruino
See all- CVE-2026-88388High
Espruino 2v29 (commit bffc6d0) contains a stack-based buffer overflow vulnerability in the JavaScript error stack-trace handling path on 64-bit builds. A remote attacker can supply JavaScript input that triggers an exception and reaches jslPrintTokenLineMarker(), which passes the address of a 4-byte int column variable to jsvGetLineAndCol() as a size_t pointer. jsvGetLineAndCol() performs an 8-byte write through the mismatched pointer, overwriting adjacent stack memory.
- CVE-2026-88390High
In Espruino 2v29 (commit bffc6d0), the jslGetTokenValueAsString() function has an out-of-bounds write vulnerability. Crafted JavaScript input with an overlong token can trigger a one-byte write beyond the JsLex.token buffer in RELEASE/NO_ASSERT builds, corrupting the adjacent tokenValue pointer and leading to memory corruption, application crashes, or denial of service.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS