OpenPrinting cups up to 2.4.16 on Linux IPP Attribute cups/ppd-cache.c _ppdCreateFromIPP length integer underflow

Summaryinfo

A vulnerability classified as critical was found in OpenPrinting cups up to 2.4.16 on Linux. Impacted is the function _ppdCreateFromIPP of the file cups/ppd-cache.c of the component IPP Attribute Handler. The manipulation of the argument length results in integer underflow. This vulnerability is identified as CVE-2026-39314. The attack is only possible with local access. There is not any exploit available.

Detailsinfo

A vulnerability was found in OpenPrinting cups up to 2.4.16 on Linux. It has been classified as critical. Affected is the function _ppdCreateFromIPP of the file cups/ppd-cache.c of the component IPP Attribute Handler. The manipulation of the argument length with an unknown input leads to a integer underflow vulnerability. CWE is classifying the issue as CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. This is going to have an impact on availability. CVE summarizes:

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, an integer underflow vulnerability in _ppdCreateFromIPP() (cups/ppd-cache.c) allows any unprivileged local user to crash the cupsd root process by supplying a negative job-password-supported IPP attribute. The bounds check only caps the upper bound, so a negative value passes validation, is cast to size_t (wrapping to ~2^64), and is used as the length argument to memset() on a 33-byte stack buffer. This causes an immediate SIGSEGV in the cupsd root process. Combined with systemd's Restart=on-failure, an attacker can repeat the crash for sustained denial of service.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-39314 since 04/06/2026. The exploitability is told to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 307661 (Fedora 43 : cups (2026-82a2214b53)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (307661) and CERT Bund (WID-SEC-2026-0994). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

• Fedora Linux
• Ubuntu Linux
• SUSE Linux
• SUSE openSUSE
• Microsoft Azure Linux
• Open Source CUPS

Productinfo

Type

• Printing Software

Vendor

• OpenPrinting

Name

• cups

Version

• 2.4.0
• 2.4.1
• 2.4.2
• 2.4.3
• 2.4.4
• 2.4.5
• 2.4.6
• 2.4.7
• 2.4.8
• 2.4.9
• 2.4.10
• 2.4.11
• 2.4.12
• 2.4.13
• 2.4.14
• 2.4.15
• 2.4.16

Website

• Product: https://github.com/OpenPrinting/cups/

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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