Heap-based Buffer Overflow Affecting kovidgoyal/kitty package, versions [,0.47.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published20 May 2026
- disclosed20 May 2026
- creditxplo1t-sec
Introduced: 20 May 2026
CVE-2026-33633 (opens in a new tab)How to fix?
Upgrade kovidgoyal/kitty to version 0.47.0 or higher.
Overview
Affected versions of this package are vulnerable to Heap-based Buffer Overflow via load_image_data(), which allows any process that can write to the terminal's stdin to crash kitty immediately. The vulnerability is triggered by a single APC graphics protocol command with a PNG format declaration (f=100) whose payload exceeds twice the initial buffer capacity. The overflow is attacker-controlled in both length and content, causing DoS and potentially escalation to RCE itself. This issue has been fixed in version 0.47.0.