What’s Vulnerable › Vulnerabilities
CVE-2017-9227
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 6.3% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2017-05-24 · updated 2026-06-17
- Weakness: CWE-125
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 stack out-of-bounds read occurs in mbc_enc_len() during regular expression searching. Invalid handling of reg->dmin in forward_search_range() could result in an invalid pointer dereference, as an out-of-bounds read from a stack buffer.
Affected products
- Oniguruma Project Oniguruma: 6.2.0
- PHP: from 5.6.0 before 5.6.31; from 7.0.0 before 7.0.21; from 7.1.0 before 7.1.7 — fixed in 5.6.31, 7.0.21, 7.1.7
How to fix
Upgrade to a fixed version: PHP 5.6.31, 7.0.21, 7.1.7. Check the vendor advisory for mitigations.
References
- http://www.securityfocus.com/bid/100538
- https://access.redhat.com/errata/RHSA-2018:1296
- https://github.com/kkos/oniguruma/commit/9690d3ab1f9bcd2db8cbe1fe3ee4a5da606b8814
- https://github.com/kkos/oniguruma/issues/58
- http://www.securityfocus.com/bid/100538
- https://access.redhat.com/errata/RHSA-2018:1296
- https://github.com/kkos/oniguruma/commit/9690d3ab1f9bcd2db8cbe1fe3ee4a5da606b8814
- https://github.com/kkos/oniguruma/issues/58
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