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CVE-2026-33633

Kovidgoyal Kitty buffer overflow

7.5 HIGHPublic exploitEPSS 0.46%
  1. Published19 May 2026

Description

Kitty is a cross-platform GPU based terminal. Versions 0.46.2 and below contain a heap buffer overflow in load_image_data() that allows any process which 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Kovidgoyal Kitty< 0.47.0

Remediation

Fixed in
Kovidgoyal Kitty≥ 0.47.0

References

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Frequently asked

Is CVE-2026-33633 being actively exploited?

CVE-2026-33633 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.46%.

How severe is CVE-2026-33633?

CVE-2026-33633 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.46% probability of exploitation.

Which products are affected by CVE-2026-33633?

Affected products include Kovidgoyal Kitty.

How do I fix CVE-2026-33633?

Upgrade affected software to a fixed version, for example Kovidgoyal Kitty 0.47.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33633 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.