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A four-CVE chain affecting CUPS and its cups-browsed component allows unauthenticated attackers to trigger remote command execution on vulnerable Linux systems, with potential exposure for macOS hosts using CUPS. An attacker can send a crafted UDP packet to port 631, induce cups-browsed to retrieve data from an attacker-controlled IPP server, and inject malicious printer attributes into a temporary PPD file; execution occurs when a user submits a print job.
The resulting commands run as the lp user and may be constrained by the cupsd AppArmor profile. Internet-exposed CUPS services face the highest risk. Security teams should investigate unexpected UDP/631 traffic, untrusted or anomalous lp-owned files, foomatic-rip executions, and known proof-of-concept marker files; the attack was publicly disclosed with an RCE proof of concept before CVEs and patches were broadly available.
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Wiz Threat Research and Datadog observed several IP addresses scanning or communicating with UDP port 631 following disclosure of the CUPS flaw chain. Wiz stated that no successful in-the-wild exploitation had been reported as of September 29, though the activity could represent malicious scanning or security research.
Simone Margaritelli, known as EvilSocket, publicly disclosed the CUPS remote-code-execution chain and an RCE proof of concept. Exploitation begins with an unauthenticated UDP/631 request to cups-browsed and requires a user to submit a print job to trigger the injected command.
The CUPS/cups-browsed vulnerability chain was initially reported to maintainers. The chain includes flaws later tracked as CVE-2024-47176, CVE-2024-47076, CVE-2024-47175, and CVE-2024-47177.
Elastic released out-of-the-box detection-rule updates for supported Stack versions to identify possible CUPS exploitation, including suspicious shell execution, outbound connections, and file creation by foomatic-rip or its lp-owned child processes.
Vulnerability details were reportedly leaked before CVE assignments and patches were available, preceding the public disclosure.
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Researchers disclosed a high-impact vulnerability chain in **OpenPrinting CUPS** affecting version `2.4.16` and earlier that can let an unauthenticated remote attacker progress from network-reachable print-job submission to **code execution as `lp`** and then to a **root-level file overwrite**. The chain combines `CVE-2026-34980`, which abuses anonymous `Print-Job` requests against a shared PostScript queue, with `CVE-2026-34990`, an authorization flaw that lets a local unprivileged user coerce `cupsd` into authenticating to an attacker-controlled localhost IPP service and reuse a print admin token to overwrite root-owned files. Public advisories and proof-of-concept details were released by researcher Asim Viladi Oglu Manizada and OpenPrinting, and fixes were committed publicly even though no patched release was yet available. Defenders were urged to reduce exposure immediately because exploitation depends on reachable `cupsd` services, legacy shared queues, and permissive submission behavior rather than user interaction. Recommended mitigations include disabling or restricting network exposure of CUPS, requiring authentication for shared queue submissions, disabling shared legacy queues where possible, and confining the service with **SELinux** or **AppArmor**. Follow-on discussion noted that removing CUPS outright may be impractical on some Ubuntu systems because `cupsd` is commonly installed by default and intertwined with other packages, making service isolation and firewalling more realistic short-term controls.
Jun 29, 2026
Multiple vulnerabilities in the Common Unix Printing System (**CUPS**) were publicly disclosed, including flaws that can be chained into **remote code execution** on affected Linux and Unix systems. Reporting described the issue as a critical CUPS-based RCE risk, while an `oss-security` disclosure listed multiple **CVEs** tied to the print server and related components, expanding the scope from a single bug to a broader set of weaknesses in widely deployed printing infrastructure. Subsequent coverage said AI agents were able to identify vulnerabilities in the same Linux and Unix print server stack, underscoring how quickly offensive research techniques can surface exploitable flaws in foundational services. Because CUPS is commonly enabled across enterprise and workstation environments, the disclosures raised concern that exposed or reachable print services could provide attackers with a path to execute code remotely, making patching, service exposure review, and printer-related attack surface reduction urgent priorities.
Jul 12, 2026
A critical vulnerability in HP Linux Imaging and Printing (**HPLIP**), tracked as **`CVE-2026-14544`**, allows unauthenticated remote attackers to trigger arbitrary code execution, privilege escalation, denial of service, or memory corruption by sending specially crafted print data to the **`hpcups`** processing path. The bug is an integer overflow (**`CWE-190`**) and has been rated **CVSS 9.8**. Researchers and downstream reporting described it as an incomplete fix for the earlier **`CVE-2026-8631`**, meaning prior remediation did not fully eliminate the underlying issue. The flaw affects HPLIP versions prior to **`3.26.4`** and has broad exposure because HPLIP is widely deployed on Linux systems that support HP printers. Upstream reportedly fixed the issue in **`3.26.4`**, while Linux vendors including Ubuntu, Debian, SUSE/openSUSE, Oracle Linux, and Red Hat have identified affected products or begun issuing and backporting updates; Red Hat said **RHEL 8, 9, and 10** are affected, while **RHEL 6 and 7** are not. Until patches are fully available across distributions, defenders have been urged to apply vendor security updates as they are released, restrict network exposure to printing services such as CUPS, isolate print servers, monitor print activity, and remove HPLIP where it is not required.
Jul 9, 2026