An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A heap out-of-bounds write or read occurs in next_state_val() during regular expression compilation. Octal numbers larger than 0xff are not handled correctly in fetch_token() and fetch_token_in_cc(). A malformed regular expression containing an octal number in the form of '\700' would produce an invalid code point value larger than 0xff in next_state_val(), resulting in an out-of-bounds write memory corruption.
| Vendor | Product | Versions |
|---|---|---|
| Alpine:v3.4 | php5 | 0, 5.2.10-r0, 5.2.10-r2 |
| Alpine:v3.5 | php5 | 0, 5.2.10-r0, 5.2.10-r2 |