CVE-2014-8964

What it actually does

Heap-based buffer overflow in PCRE triggered by a crafted regular expression that exploits an assertion permitting zero repeats, resulting in memory corruption that can cause crashes or other unspecified effects.

Why it matters to the business

Applications relying on vulnerable PCRE versions may experience denial-of-service crashes when processing untrusted input, leading to service outages; the issue affects many downstream packages across Linux distributions and databases, though low exploitability and age reduce urgency for most environments.

How an attack unfolds

An attacker supplies a specially crafted regular expression containing an assertion that allows zero repeats to a vulnerable application, triggering the heap overflow during PCRE processing to achieve a crash or potential further impact.

How to fix it

Upgrade the PCRE library beyond version 8.36 in all affected products and apply the latest vendor patches for distributions and packages such as MariaDB, Red Hat Enterprise Linux variants, Fedora, openSUSE, Oracle Solaris, and similar ecosystems.

How to confirm the fix worked

Verify installed PCRE versions are newer than 8.36, review application dependencies for updates, and test regex processing with known triggering patterns in isolated environments to confirm stability.

Typical attack path

1. Locate an application or service that accepts and processes regular expressions using a vulnerable PCRE version
2. Craft a malicious regular expression that abuses the zero-repeat assertion
3. Submit the regex as input to the target application
4. Trigger heap corruption leading to denial of service or attempted code execution

How to detect it

Review application logs and crash dumps for PCRE-related segmentation faults or memory errors when processing regex input; examine any historical records of regex submissions around the time of potential exposure.

What your security team should do

• Inventory all systems and applications using PCRE or dependent packages
• Prioritize patching for any internet-facing or high-availability services
• Monitor vulnerability feeds for new exploit maturity developments given the stable low EPSS