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Fencer Intel
high 7.5

CVE-2026-33633 json

Kitty has a Heap Buffer Overflow in its Graphics Protocol Handler

published 5mo ago modified 3mo ago also EUVD-2026-30964

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

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.

Patch / fix

  • kitty_project kitty 0.47.0
  • kovidgoyal kitty 0.47.0
  • kitty Debian 13 0.41.1-2+deb13u1
  • kitty Debian 14 0.47.0-1

debian advisories DEBIAN-CVE-2026-33633

  • kitty Ubuntu 25.10 0.41.1-2+deb13u1build0.25.10.1
  • kitty Ubuntu Pro 20.04 LTS 0.15.0-1ubuntu0.2+esm1
  • kitty Ubuntu Pro 22.04 LTS 0.21.2-1ubuntu0.22.04.1+esm1
  • kitty Ubuntu Pro 24.04 LTS 0.32.2-1ubuntu0.4+esm1
  • kitty Ubuntu Pro 26.04 LTS 0.45.0-1ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2026-33633

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kitty openSUSE Leap 16.0 0.48.2-bp160.1.1

opensuse advisories openSUSE-SU-2026:21599-1

Is CVE-2026-33633 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-33633 updated cvss 8.8

kitty: Kitty: Remote Code Execution via crafted APC graphics protocol command

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
5mo ago

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/kovidgoyal/kitty/security/advisories/GHSA-j68c-v8x4-269g referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

  • kovidgoyal kitty

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.