CVE-2026-33642: Kitty is a cross-platform GPU based terminal

Q: How do I fix CVE-2026-33642?

kitty: upgrade to 0.47.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-33642 being exploited?

CVE-2026-33642 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33642 affect?

CVE-2026-33642 affects kitty. Severity is critical (CVSS 9.9). 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 inte

Q: How urgent is CVE-2026-33642?

Priority 50/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.9REMOTEUPGRADE

CVE-2026-33642 is a critical-severity flaw (CVSS 9.9) affecting kitty. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 craft

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.9 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-125, CWE-190, CWE-787
Published	2026-05-19
Last modified	2026-07-24

Publisher (CNA): GitHub, Inc. · Vendor: kovidgoyal

Last updated 2026-07-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-19 19:16 UTCPublished CVE record published
2026-07-24 09:10 UTCUpdated Record last modified

kovidgoyal kitty UPGRADE

Affected: < 0.47.0

Fixed in: 0.47.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy kitty || rpm -q kitty || kitty --version

2. UPGRADE to 0.47.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade kitty

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kitty

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33642?

kitty: upgrade to 0.47.0. Exact commands for each OS are on this page.

Is CVE-2026-33642 being exploited?

CVE-2026-33642 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33642 affect?

CVE-2026-33642 affects kitty. Severity is critical (CVSS 9.9). 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 inte

How urgent is CVE-2026-33642?

Priority 50/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-42850 HIGH 8.8 UPGRADE Kitty is a cross-platform GPU based terminal
CVE-2026-42851 HIGH 7.8 UPGRADE Kitty is a cross-platform GPU based terminal
CVE-2026-54055 MEDIUM 5.0 UPGRADE Kitty is a cross-platform GPU based terminal
CVE-2026-54056 HIGH 7.6 UPGRADE Kitty is a cross-platform GPU based terminal
CVE-2026-54057 HIGH 7.8 UPGRADE Kitty is a cross-platform GPU based terminal

References

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