Vulnerability Details CVE-2026-34990
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a local unprivileged user can coerce cupsd into authenticating to an attacker-controlled localhost IPP service with a reusable Authorization: Local ... token. That token is enough to drive /admin/ requests on localhost, and the attacker can combine CUPS-Create-Local-Printer with printer-is-shared=true to persist a file:///... queue even though the normal FileDevice policy rejects such URIs. Printing to that queue gives an arbitrary root file overwrite; the PoC below uses that primitive to drop a sudoers fragment and demonstrate root command execution. At time of publication, there are no publicly available patches.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 1.3%
CVSS Severity
CVSS v3 Score 7.8
Products affected by CVE-2026-34990
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cpe:2.3:a:openprinting:cups:1.0
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cpe:2.3:a:openprinting:cups:1.0.1
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cpe:2.3:a:openprinting:cups:1.0.2
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cpe:2.3:a:openprinting:cups:1.0.3
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cpe:2.3:a:openprinting:cups:1.0.4
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cpe:2.3:a:openprinting:cups:1.0.5
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cpe:2.3:a:openprinting:cups:1.1
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cpe:2.3:a:openprinting:cups:1.1.1
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cpe:2.3:a:openprinting:cups:1.1.10
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cpe:2.3:a:openprinting:cups:1.1.10.1
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cpe:2.3:a:openprinting:cups:1.1.11
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cpe:2.3:a:openprinting:cups:1.1.12
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cpe:2.3:a:openprinting:cups:1.1.13
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cpe:2.3:a:openprinting:cups:1.1.14
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cpe:2.3:a:openprinting:cups:1.1.15
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cpe:2.3:a:openprinting:cups:1.1.15.1
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cpe:2.3:a:openprinting:cups:1.1.16
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cpe:2.3:a:openprinting:cups:1.1.17
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cpe:2.3:a:openprinting:cups:1.1.18
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cpe:2.3:a:openprinting:cups:1.1.19
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cpe:2.3:a:openprinting:cups:1.1.2
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cpe:2.3:a:openprinting:cups:1.1.2.3
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cpe:2.3:a:openprinting:cups:1.1.20
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cpe:2.3:a:openprinting:cups:1.1.21
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cpe:2.3:a:openprinting:cups:1.1.22
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cpe:2.3:a:openprinting:cups:1.1.23
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cpe:2.3:a:openprinting:cups:1.1.3
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cpe:2.3:a:openprinting:cups:1.1.4
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cpe:2.3:a:openprinting:cups:1.1.5
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cpe:2.3:a:openprinting:cups:1.1.5.1
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cpe:2.3:a:openprinting:cups:1.1.5.2
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cpe:2.3:a:openprinting:cups:1.1.6
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cpe:2.3:a:openprinting:cups:1.1.6.1
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cpe:2.3:a:openprinting:cups:1.1.6.2
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cpe:2.3:a:openprinting:cups:1.1.6.3
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cpe:2.3:a:openprinting:cups:1.1.7
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cpe:2.3:a:openprinting:cups:1.1.8
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cpe:2.3:a:openprinting:cups:1.1.9
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cpe:2.3:a:openprinting:cups:1.1.9.1
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cpe:2.3:a:openprinting:cups:1.2.0
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cpe:2.3:a:openprinting:cups:1.2.1
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cpe:2.3:a:openprinting:cups:1.2.10
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cpe:2.3:a:openprinting:cups:1.2.11
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cpe:2.3:a:openprinting:cups:1.2.12
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cpe:2.3:a:openprinting:cups:1.2.2
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cpe:2.3:a:openprinting:cups:1.2.3
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cpe:2.3:a:openprinting:cups:1.2.4
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cpe:2.3:a:openprinting:cups:1.2.5
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cpe:2.3:a:openprinting:cups:1.2.6
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cpe:2.3:a:openprinting:cups:1.2.7
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cpe:2.3:a:openprinting:cups:1.2.8
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cpe:2.3:a:openprinting:cups:1.2.9
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cpe:2.3:a:openprinting:cups:1.3.0
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cpe:2.3:a:openprinting:cups:1.3.10
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cpe:2.3:a:openprinting:cups:1.3.11
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cpe:2.3:a:openprinting:cups:1.3.2
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cpe:2.3:a:openprinting:cups:1.3.3
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cpe:2.3:a:openprinting:cups:1.3.4
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cpe:2.3:a:openprinting:cups:1.3.5
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cpe:2.3:a:openprinting:cups:1.3.6
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cpe:2.3:a:openprinting:cups:1.3.7
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cpe:2.3:a:openprinting:cups:1.3.8
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cpe:2.3:a:openprinting:cups:1.3.9
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cpe:2.3:a:openprinting:cups:1.4.0
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cpe:2.3:a:openprinting:cups:1.4.1
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cpe:2.3:a:openprinting:cups:1.4.2
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cpe:2.3:a:openprinting:cups:1.4.3
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cpe:2.3:a:openprinting:cups:1.4.4
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cpe:2.3:a:openprinting:cups:1.4.5
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cpe:2.3:a:openprinting:cups:1.4.6
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cpe:2.3:a:openprinting:cups:1.4.7
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cpe:2.3:a:openprinting:cups:1.4.8
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cpe:2.3:a:openprinting:cups:1.5.0
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cpe:2.3:a:openprinting:cups:1.5.1
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cpe:2.3:a:openprinting:cups:1.5.2
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cpe:2.3:a:openprinting:cups:1.5.3
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cpe:2.3:a:openprinting:cups:1.5.4
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cpe:2.3:a:openprinting:cups:1.6.0
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cpe:2.3:a:openprinting:cups:1.6.1
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cpe:2.3:a:openprinting:cups:1.6.2
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cpe:2.3:a:openprinting:cups:1.6.3
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cpe:2.3:a:openprinting:cups:1.6.4
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cpe:2.3:a:openprinting:cups:1.7.0
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cpe:2.3:a:openprinting:cups:1.7.1
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cpe:2.3:a:openprinting:cups:1.7.2
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cpe:2.3:a:openprinting:cups:1.7.3
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cpe:2.3:a:openprinting:cups:1.7.4
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cpe:2.3:a:openprinting:cups:1.7.5
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cpe:2.3:a:openprinting:cups:2.0.0
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cpe:2.3:a:openprinting:cups:2.0.1
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cpe:2.3:a:openprinting:cups:2.0.2
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cpe:2.3:a:openprinting:cups:2.0.3
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cpe:2.3:a:openprinting:cups:2.0.4
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cpe:2.3:a:openprinting:cups:2.1.0
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cpe:2.3:a:openprinting:cups:2.1.2
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cpe:2.3:a:openprinting:cups:2.1.3
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cpe:2.3:a:openprinting:cups:2.1.4
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cpe:2.3:a:openprinting:cups:2.2.0
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cpe:2.3:a:openprinting:cups:2.2.1
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cpe:2.3:a:openprinting:cups:2.2.10
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cpe:2.3:a:openprinting:cups:2.2.11
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cpe:2.3:a:openprinting:cups:2.2.12
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cpe:2.3:a:openprinting:cups:2.2.13
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cpe:2.3:a:openprinting:cups:2.2.2
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cpe:2.3:a:openprinting:cups:2.2.3
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cpe:2.3:a:openprinting:cups:2.2.4
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cpe:2.3:a:openprinting:cups:2.2.5
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cpe:2.3:a:openprinting:cups:2.2.6
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cpe:2.3:a:openprinting:cups:2.2.7
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cpe:2.3:a:openprinting:cups:2.2.8
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cpe:2.3:a:openprinting:cups:2.2.9
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cpe:2.3:a:openprinting:cups:2.3.0
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cpe:2.3:a:openprinting:cups:2.3.1
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cpe:2.3:a:openprinting:cups:2.3.3
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cpe:2.3:a:openprinting:cups:2.4.0
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cpe:2.3:a:openprinting:cups:2.4.1
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cpe:2.3:a:openprinting:cups:2.4.10
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cpe:2.3:a:openprinting:cups:2.4.11
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cpe:2.3:a:openprinting:cups:2.4.12
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cpe:2.3:a:openprinting:cups:2.4.13
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cpe:2.3:a:openprinting:cups:2.4.14
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cpe:2.3:a:openprinting:cups:2.4.15
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cpe:2.3:a:openprinting:cups:2.4.2
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cpe:2.3:a:openprinting:cups:2.4.3
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cpe:2.3:a:openprinting:cups:2.4.4
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cpe:2.3:a:openprinting:cups:2.4.5
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cpe:2.3:a:openprinting:cups:2.4.6
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cpe:2.3:a:openprinting:cups:2.4.7
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cpe:2.3:a:openprinting:cups:2.4.8
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cpe:2.3:a:openprinting:cups:2.4.9