CVE-2019-19204 Memory corruption in n/a

What is CVE-2019-19204?

CVE-2019-19204 is a high-severity memory corruption vulnerability in Debian Debian Linux, 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 fetch_interval_quantifier (formerly known as fetch_range_quantifier) in regparse.c, PFETCH is called without checking PEND. This leads to a heap-based buffer over-read.

Weakness: CWE-125

Which versions are affected by CVE-2019-19204?

It affects 3 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Oniguruma Project Oniguruma.

How do I fix CVE-2019-19204?

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-2019-19204 being exploited?

There is no known exploitation of CVE-2019-19204 in the wild and no public exploit code.

Public exploit code: 2 proofs of concept on GitHub.

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• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

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

Also known as DEBIAN-CVE-2019-19204, GHSA-563p-6h7j-cxg6, UBUNTU-CVE-2019-19204.