Loop with Unreachable Exit Condition ('Infinite Loop') Affecting qemu package, versions <1:7.2+dfsg-7+deb12u2


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
1.89% (78th percentile)

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  • Snyk IDSNYK-ECHOLATEST-QEMU-18321866
  • published27 Jul 2026
  • disclosed13 Sept 2023

Introduced: 13 Sep 2023

CVE-2023-3255  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

Upgrade Echo:latest qemu to version 1:7.2+dfsg-7+deb12u2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream qemu package and not the qemu package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. A wrong exit condition may lead to an infinite loop when inflating an attacker controlled zlib buffer in the inflate_buffer function. This could allow a remote authenticated client who is able to send a clipboard to the VNC server to trigger a denial of service.

CVSS Base Scores

version 3.1