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CVE-2026-88389

• Severity: medium (CVSS 6.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-25 · updated 2026-09-30
• Weakness: CWE-476

Description

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.

References

• https://github.com/espruino/Espruino/commit/0db0663ac5201a6fea68094b45da673edec45187
• https://github.com/espruino/Espruino/issues/2745
• https://github.com/espruino/Espruino/issues/2745

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