JIS X 0208 bytes that produce ASCII characters

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Sequences of two bytes that when in the ISO-2022-JP charset and preceded by the JIS X 0201 1978 escape sequence, produce any ASCII character after decoding.

Created byJorianWoltjer

Created Sep 22, 2024

Updated May 27, 2025

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CategoryCharacter Encoding

VisibilityPublic

TypeJS

CharsetUTF-8

Code used before fuzz:

d = new TextDecoder('ISO-2022-JP')

Template used:

b1 = Math.floor(i / 256);0x0D
b2 = i % 256;0x0D
c = d.decode(new Uint8Array([0x1b, 0x24, 0x40, b1, b2])) 0x0D
if (c.split("").map((c) => c.charCodeAt(0)).some((i) => i < 127)) log(i)

Sample payloads

b1 = Math.floor(i / 256);0x0D
b2 = i % 256;0x0D
c = d.decode(new Uint8Array([0x1b, 0x24, 0x40, b1, b2])) 0x0D
if (c.split("").map((c) => c.charCodeAt(0)).some((i) => i < 127)) alert(i)

JIS X 0208 bytes that produce ASCII characters

Sample payloads

Fuzz results

Distributed Fuzzing