CVE-2026-64611 Libcupsfilters: cups-filters: libcupsfilters: cpu exhaustion via infinite loop in cfieee1284normalizemakemodel()
A network-adjacent attacker can cause CPU exhaustion and denial of service by broadcasting a crafted printer advertisement with an empty model field.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64611?
CVE-2026-64611 is a high-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 23 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw was found in libcupsfilters. The cfIEEE1284NormalizeMakeModel() function enters an infinite loop when processing a printer-advertised IEEE-1284 device ID with an empty model field, causing sustained CPU consumption. A network-adjacent attacker could exploit this by broadcasting a specially crafted printer advertisement, leading to denial of service.
Weakness: CWE-835
Which versions are affected by CVE-2026-64611?
How do I fix CVE-2026-64611?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-64611 being exploited?
There is no known exploitation of CVE-2026-64611 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-64611, GHSA-m7r8-8qc5-j4jf, UBUNTU-CVE-2026-64611.