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CVE-2026-33642

Kovidgoyal Kitty buffer overflow

9.9 CRITICALPublic exploitEPSS 0.43%
  1. Published19 May 2026

Description

Kitty is a cross-platform GPU based terminal. In versions 0.46.2 and below, the handle_compose_command() function in kitty/graphics.c performs bounds validation on composition offsets using unsigned 32-bit arithmetic that is subject to integer wrapping, potentially leading to Heap Buffer Over-Read/Write. An attacker who can write escape sequences to a kitty terminal (e.g., via a malicious file, SSH login banner, or piped content) can supply crafted x_offset/y_offset values that pass the bounds check after wrapping but cause massive out-of-bounds heap memory access in compose_rectangles(). No user interaction is required. No non-default configuration is required. The attacker only needs the ability to produce output in a kitty terminal window. This issue has been fixed in version 0.47.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/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-2026-33642 being actively exploited?

CVE-2026-33642 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.43%.

How severe is CVE-2026-33642?

CVE-2026-33642 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.43% probability of exploitation.

Which products are affected by CVE-2026-33642?

Affected products include Kovidgoyal Kitty.

How do I fix CVE-2026-33642?

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-2026-33642 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.