# CVE-2026-64611: OpenPrinting libcupsfilters infinite loop in cfIEEE1284NormalizeMakeModel

Source: https://junglewise.ai/threats/cve-2026-64611-openprinting-libcupsfilters-infinite-loop-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-23. Updated: 2026-07-23  
License: CC BY 4.0 with a link back

CVE-2026-64611 · Severity: high · CVSS 7.5 · Published 2026-07-23

A flaw in the libcupsfilters library, which is used by Linux systems to manage printing tasks, can allow an attacker to disable printing services. By broadcasting a malicious printer advertisement on a local network, an attacker can cause the system's processor to become stuck in an infinite loop. This results in a denial-of-service condition where the printing service becomes unresponsive and system performance is significantly degraded.

Technologies: [OpenPrinting Cups-Filters](https://junglewise.ai/threats/technologies/cups-filters), [OpenPrinting Libcupsfilters](https://junglewise.ai/threats/technologies/libcupsfilters), [Red Hat Enterprise Linux 10](https://junglewise.ai/threats/technologies/enterprise-linux-10), [Red Hat Enterprise Linux 7](https://junglewise.ai/threats/technologies/enterprise-linux-7), [Red Hat Enterprise Linux 8](https://junglewise.ai/threats/technologies/enterprise-linux-8), [Red Hat Enterprise Linux 9](https://junglewise.ai/threats/technologies/enterprise-linux-9). Vendors: [OpenPrinting](https://junglewise.ai/threats/vendors/openprinting), [Red Hat](https://junglewise.ai/threats/vendors/red-hat).

## Quick answers

**Is CVE-2026-64611 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-64611 being exploited in the wild.

**How severe is CVE-2026-64611?** High severity, with a CVSS score of 7.5, published 23 July 2026.

**Which products and versions are affected?** OpenPrinting Libcupsfilters through 2.1.1.

**Is there a fix for CVE-2026-64611?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-64611 attacked?** It is attacked over the network or from the adjacent network, in a software library.

**Am I affected by CVE-2026-64611?** Check whether you run OpenPrinting Cups-Filters, OpenPrinting Libcupsfilters, Red Hat Enterprise Linux 10 or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A vulnerability exists in the cfIEEE1284NormalizeMakeModel() function within cupsfilters/ieee1284.c of libcupsfilters through version 2.1.1. When the function processes an IEEE-1284 device ID containing an empty model (MDL) field, a logic error in the deduplication loop causes it to enter an infinite loop. Specifically, the loop fails to make progress when modelptr equals the buffer, leading to sustained 100% CPU utilization on the affected core. This is reachable over the network via cups-browsed when it processes printer-advertised device IDs via IPP or DNS-SD. At the time of reporting, no upstream fix was available.

## Affected products

- OpenPrinting libcupsfilters through 2.1.1
- OpenPrinting cups-filters
- Red Hat Red Hat Enterprise Linux 7
- Red Hat Red Hat Enterprise Linux 8
- Red Hat Red Hat Enterprise Linux 9
- Red Hat Red Hat Enterprise Linux 10

## Timeline

- 2026-07-20: other: Reported to Red Hat Bugzilla
- 2026-07-23: advisory: NVD publication date

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-64611](https://access.redhat.com/security/cve/CVE-2026-64611)
- [https://bugzilla.redhat.com/show_bug.cgi?id=2502799](https://bugzilla.redhat.com/show_bug.cgi?id=2502799)
- [https://github.com/OpenPrinting/libcupsfilters/security/advisories/GHSA-rcq7-rv5g-j3r4](https://github.com/OpenPrinting/libcupsfilters/security/advisories/GHSA-rcq7-rv5g-j3r4)

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