USN-8578-1: CUPS control character injection vulnerability

unknownCVE-2026-34980

It was discovered that CUPS did not properly filter control characters in IPP string attributes and PPD keywords. An unauthenticated attacker could exploit this to execute arbitrary code as the lp user on systems with shared target queues.

CSIRTS triage

vendor: CUPS product: CUPSOther

What: CUPS did not properly filter control characters, allowing an unauthenticated attacker to execute arbitrary code.
Who is affected: All installations of CUPS are potentially affected.
Urgency: Remediation is necessary due to the potential for exploitation.
Action: Update CUPS to the latest version.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Ubuntu Security Notices (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-07-21
Exploitation: Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8578-1

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-349800.50% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-34980	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[UPDATE] [medium] CUPS: Multiple Vulnerabilitiescert-bund