CVE-2017-9226: oniguruma_project oniguruma Out-of-bounds Write
Vulnerability summary
CVE-2017-9226 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in oniguruma_project oniguruma. EPSS estimates a 7.51% chance of exploitation in the next 30 days, higher than 94.5% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (GitHub, Date unknown)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 7 · Related 4Timeline
- 24-05-2017PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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 metrics
6 scores · 4 sources · 3 versions- OSV · AlpineEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
7.51%
Chance of exploitation in the next 30 days
Percentile
95%
Versus all other CVEs
30-day change
No change 0.00 pp
From 7.51% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
1 foundOniguruma
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu3 products
- libonig< 5.9.1-1ubuntu1.1 | < 5.9.6-1ubuntu0.1
- php5< 5.5.9+dfsg-1ubuntu4.22
- php7.0< 7.0.22-0ubuntu0.16.04.1
Alpine2 products
- php5< 5.6.31-r0
- php7< 7.0.21-r0 | < 7.1.9-r0 | < 7.1.7-r0
Debian1 product
- libonig< 6.1.3-2
Oniguruma_project1 product
- onigurumaEOL6.2.0
Php1 product
- php< 5.6.31 | ≥ 7.0.0, < 7.0.21 | ≥ 7.1.0, < 7.1.7
5 vendors · 8 products
References
11 links- github.com/kkos/oniguruma/commit/f015fbdd95f76438cd86366467bb2b39870dd7c6X Refsource CONFIRMPatchThird Party Advisory
- github.com/kkos/oniguruma/commit/b4bf968ad52afe14e60a2dc8a95d3555c543353aX Refsource CONFIRMPatchThird Party Advisory
