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CVE-2026-34990 affects OpenPrinting CUPS 2.4.16 and earlier. A local unprivileged user can coerce the CUPS scheduler daemon (cupsd) into authenticating to an attacker-controlled localhost IPP service and exposing a reusable "Authorization: Local ..." token. The disclosed attack uses temporary local printer creation on localhost to induce cupsd to authenticate to the attacker-controlled listener. The captured token is then sufficient to issue localhost /admin/ requests as a local print administrator. Using that access, the attacker can combine CUPS-Create-Local-Printer with printer-is-shared=true to persist a file:///... queue even though normal FileDevice policy would reject such URIs. Printing to the resulting queue yields an arbitrary root file overwrite primitive. Public reporting notes a proof of concept that overwrites a file under /etc/sudoers.d/ to demonstrate root command execution. Some sources in the provided content also describe the issue as involving temporary printers and a race against validation/cleanup of the dangerous queue; however, the core behavior consistently described is token disclosure via localhost IPP authentication followed by privileged queue creation leading to root file overwrite.
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No public exploit code observed for this vulnerability.
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15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Более поздняя уязвимость в экосистеме CUPS, упомянутая как пример продолжающихся архитектурных проблем; позволяет локальному непривилегированному пользователю заставить cupsd аутентифицироваться к атакующему IPP-сервису.
A CUPS vulnerability that was chained with CVE-2026-34980 to achieve unauthenticated remote code execution and root file overwrite.
A local print admin token disclosure vulnerability involving temporary printers in OpenPrinting CUPS.
A zero-day privilege escalation vulnerability in CUPS that allows an attacker with low-privilege access to escalate to root by abusing temporary printer creation, stealing a reusable local authorization token, and exploiting a race condition to achieve arbitrary root file overwrite.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.