What’s Vulnerable › Vulnerabilities

CVE-2019-19203

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-11-21 · updated 2026-06-17
• Weakness: CWE-125

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.

Affected products

• Fedoraproject Fedora: 30, 31
• Oniguruma Project Oniguruma: from 6.0.0 before 6.9.4; 6.9.4-rc1 — fixed in 6.9.4

How to fix

Upgrade to a fixed version: Oniguruma Project Oniguruma 6.9.4. Check the vendor advisory for mitigations.

References

• https://github.com/ManhNDd/CVE-2019-19203
• https://github.com/kkos/oniguruma/issues/163
• https://github.com/kkos/oniguruma/releases/tag/v6.9.4_rc2
• https://github.com/tarantula-team/CVE-2019-19203
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NO267PLHGYZSWX3XTRPKYBKD4J3YOU5V/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V3MBNW6Z4DOXSCNWGBLQ7OA3OGUJ44WL/
• https://github.com/ManhNDd/CVE-2019-19203
• https://github.com/kkos/oniguruma/issues/163
• https://github.com/kkos/oniguruma/releases/tag/v6.9.4_rc2
• https://github.com/tarantula-team/CVE-2019-19203
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NO267PLHGYZSWX3XTRPKYBKD4J3YOU5V/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V3MBNW6Z4DOXSCNWGBLQ7OA3OGUJ44WL/

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