How severe is CVE-2026-33633?

CVE-2026-33633 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33633 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33633?

CVE-2026-33633 affects Kovidgoyal Kitty. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33633?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-33633 have an EU (EUVD) identifier?

Yes. CVE-2026-33633 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30964.

When was CVE-2026-33633 published?

CVE-2026-33633 was published on 2026-05-19 and last updated on 2026-06-17.

CVE-2026-33633

CVE-2026-33633 is a high-severity vulnerability in Kovidgoyal Kitty with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-30964
Weakness: CWE-122
Affected product: Kovidgoyal Kitty
Published: 2026-05-19
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-33633?: 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.
How severe is CVE-2026-33633?: CVE-2026-33633 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-33633 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33633?: CVE-2026-33633 affects Kovidgoyal Kitty. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33633?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-33633 have an EU (EUVD) identifier?: Yes. CVE-2026-33633 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30964.
When was CVE-2026-33633 published?: CVE-2026-33633 was published on 2026-05-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:kovidgoyal:kitty:*:*:*:*:*:*:*:*

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