Firefox < 147.0.4 Heap Buffer Overflow via libvpx
CVE-2026-2447 Published on February 16, 2026
Heap buffer overflow in libvpx
Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1, Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2.
Vulnerability Analysis
CVE-2026-2447 can be exploited with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Products Associated with CVE-2026-2447
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Affected Versions
Mozilla Firefox:- Version unspecified and below 147.0.4 is affected.
- Version unspecified and below 140.7.1 is affected.
- Version unspecified and below 115.32.1 is affected.
- Version unspecified and below 140.7.2 is affected.
- Version unspecified and below 147.0.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.