A growing threat

The claim that zero-day attacks — intrusions that exploit software vulnerabilities before a patch is available — are on the rise was examined against 12 primary sources. The evidence reviewed is consistent with an upward trend in zero-day activity.

Specific figures on the scale of the increase could not be independently established from the materials at hand, so the magnitude of the growth remains unconfirmed.

What remains uncertain

While the overall direction of the trend is supported, the sources reviewed did not allow direct retrieval of the underlying chart data, leaving exact numbers open to further confirmation.

Taken together, the available evidence supports the core of the claim, though precise figures remain outstanding — making the assessment Mostly True.