CVE-2023-4048 Memory corruption in Firefox

What is CVE-2023-4048?

CVE-2023-4048 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 1 Aug 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An out-of-bounds read could have led to an exploitable crash when parsing HTML with DOMParser in low memory situations. This vulnerability affects Firefox < 116, Firefox ESR < 102.14, and Firefox ESR < 115.1.

Weakness: CWE-125

Which versions are affected by CVE-2023-4048?

It affects 2 products.

Products include Debian Debian Linux, Mozilla Firefox.

How do I fix CVE-2023-4048?

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-2023-4048 being exploited?

There is no known exploitation of CVE-2023-4048 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• 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-2023-4048, GHSA-969j-v3p3-p4vv, UBUNTU-CVE-2023-4048.