CVE-2019-19203 Memory corruption in n/a

What is CVE-2019-19203?

CVE-2019-19203 is a high-severity memory corruption vulnerability in Fedoraproject Fedora, published on 21 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-125

Which versions are affected by CVE-2019-19203?

It affects 2 products.

Products include Fedoraproject Fedora, Oniguruma Project Oniguruma.

How do I fix CVE-2019-19203?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2019-19203 being exploited?

There is no known exploitation of CVE-2019-19203 in the wild and no public exploit code.

Public exploit code: 2 proofs of concept on GitHub.

Other vulnerabilities in Fedoraproject Fedora

• CVE-2024-4577 PHP-CGI OS Command Injection Exploited Critical 9.8
• CVE-2021-39226 Grafana Authentication Bypass Exploited Critical 9.8
• CVE-2019-5544 VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow Exploited Critical 9.8
• CVE-2024-4947 Google Chromium V8 Type Confusion Exploited Critical 9.6
• CVE-2024-4671 Google Chromium Visuals Use-After-Free Exploited Critical 9.6

All Fedoraproject Fedora vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLSA-2026-1776951056, DEBIAN-CVE-2019-19203, GHSA-ggp4-f63c-mcc4, UBUNTU-CVE-2019-19203.