CVE-2026-33999HIGH· 7.8MITRENVD대응게시일: 2026. 04. 23.수정일: 2026. 07. 15.

Xorg: xwayland: x.org x server: denial of service via integer underflow in xkb compatibility map handling

위협 신호 · CVSS · EPSS · KEV

정기 패치· 높은 악용 신호 없음

CVSS

7.8high

이론적 심각도 점수

EPSS

0.4%상위 69.3%

30일 내 악용 확률 예측

KEV

미등재

실측 악용 기록 없음

권장 대응 기한차기 업그레이드 시CISA SSVC 기준

별도 긴급 패치 불필요 — 정기 시스템 업그레이드 주기에 맞춰 조치

완전 장악· KEV 미등재 · 자동화 어려움 · 완전 장악 · 내부 한정

CVSS 벡터 · 메트릭

악용 경로

공격 벡터로컬

공격 복잡도낮음

필요 권한낮음

사용자 상호작용불필요

범위불변

영향

기밀성 영향높음

무결성 영향높음

가용성 영향높음

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

상세 설명

A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other severe impacts.

AI 심층 분석

공격 시나리오 · 재현 가능한 PoC 페이로드 · 즉시 적용 가능한 차단 패치를 한 번에 받아 보세요. 보안 운영팀이 그대로 점검·티켓팅에 쓸 수 있는 형태로 정리해 드립니다.

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참고 자료 33

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