Array index -1

Death certificate

Status

🪦 Buried

Cause of death

Off-by-oneLooped once too often, or once too few. A `<=` where a `<` belonged.

Severity

Critical

Hours to kill

22 hours

Killed by

Jashanpreet

Language

C++

Born

19 Jan 2026

Fix merged

27 Jan 2026

Buried

5 Feb 2026

Component

parser

Symptoms

The parser read index -1 on empty input and overwrote the memory next to the buffer.

The fix

Checked for empty input before reading the last element.