CVE-2026-91104 — Linux Imaging And Printing
CRITICALCVE-2026-91104 is a critical-severity (CVSS 9.8) CWE-122 vulnerability in hp linux imaging and printing. A fix is available — see the affected versions and patch details below.
HP has identified and remediated multiple externally reported vulnerabilities within HPLIP. The findings affect several software components that could potentially enable remote code…
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2026-91104 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Description
HP has identified and remediated multiple externally reported vulnerabilities within HPLIP. The findings affect several software components that could potentially enable remote code execution, privilege escalation, denial of service, information disclosure, or unauthorized file modification under certain conditions.
Affected Products
linux imaging and printinghpDetection & mitigation playbook
Vendor / applianceDetect
Inventory every hp linux imaging and printing deployment and check each version against the affected-products list above.
Fix
Apply the hp linux imaging and printing security patch or hotfix for CVE-2026-91104 on the affected version, following the vendor advisory for your exact build.
Workarounds
Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
This vulnerability allows an unauthenticated attacker to achieve arbitrary code execution and privilege escalation, among other security impacts. HPLIP provides printer drivers and tools for managing HP devices. The client tools are not exposed to the network. Printer, scanner, and fax drivers are used by CUPS (once…
To mitigate this vulnerability, consider removing the hplip package if its functionality is not required by using the command indicated below. Note this will remove HP printer support and related utilities from the system. ~~~ sudo dnf remove hplip ~~~Source: Red Hat security advisory for CVE-2026-91104 (CC BY 4.0)
Frequently Asked Questions
Is CVE-2026-91104 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.