CVE-2019-19203
CVSS v3
7.5
HIGH
EPSS Score
4.1 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function gb18030_mbc_enc_len in file gb18030.c, a UChar pointer is dereferenced without checking if it passed the end of the matched string. This leads to a heap-based buffer over-read.
Technical details
- Published
- 2019-11-21
Frequently asked questions
What is CVE-2019-19203?
An issue was discovered in Oniguruma 6.x before 6.9.4_rc2. In the function gb18030_mbc_enc_len in file gb18030.c, a UChar pointer is dereferenced without checking if it passed the end of the matched string. This leads to a heap-based buffer over-read.
Is CVE-2019-19203 actively exploited?
Active exploitation of CVE-2019-19203 has not been confirmed. Its EPSS score was 4.1% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2019-19203?
CVE-2019-19203 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2019-19203 affecting your environment?
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