CVE-2017-9226
A heap out-of-bounds write or read occurs in next_state_val() during regular expression compilation.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (7.51%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 7.51% probability · 94th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- oniguruma project/oniguruma · php/php
- Source
- cve@mitre.org
EPSS 7.5% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/101244Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:1296Third Party Advisory
- https://github.com/kkos/oniguruma/commit/b4bf968ad52afe14e60a2dc8a95d3555c543353aPatch, Third Party Advisory
- https://github.com/kkos/oniguruma/commit/f015fbdd95f76438cd86366467bb2b39870dd7c6Patch, Third Party Advisory
- https://github.com/kkos/oniguruma/issues/55Exploit, Issue Tracking, Third Party Advisory
- http://www.securityfocus.com/bid/101244Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:1296Third Party Advisory
- https://github.com/kkos/oniguruma/commit/b4bf968ad52afe14e60a2dc8a95d3555c543353aPatch, Third Party Advisory
- https://github.com/kkos/oniguruma/commit/f015fbdd95f76438cd86366467bb2b39870dd7c6Patch, Third Party Advisory
- https://github.com/kkos/oniguruma/issues/55Exploit, Issue Tracking, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.