CVE-2017-9229

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 5.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2017-05-24 · updated 2026-06-17
Weakness: CWE-476

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 SIGSEGV occurs in left_adjust_char_head() during regular expression compilation. Invalid handling of reg->dmax in forward_search_range() could result in an invalid pointer dereference, normally as an immediate denial-of-service condition.

Affected products

Oniguruma Project Oniguruma: 6.2.0
PHP: through 7.1.5; 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
Ruby: through 2.4.1

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

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