$ cve CVE-2017-9226 JSON

CVE-2017-9226

9.8

CRITICAL · CVSS 3.1 · EPSS 7.5% (pctl 94)

In your normal cycle

Critical by CVSS (9.8), but no sign of active exploitation.

Description

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.

Scoring

CVSS	9.8 (CRITICAL, v3.1)
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS	7.51% — more likely to be exploited than 94% of all CVEs
Weakness	CWE-787
On CISA KEV	no
Public exploit	none known
Published	2017-05-24
Last modified	2026-06-17

Affected (2)

Vendor	Product
oniguruma project	oniguruma
php	php

References

→ the Explorer · watch your stack · NVD