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Fencer Vulns
medium 4.0

CVE-2026-39314 json

CUPS has an integer underflow in `_ppdCreateFromIPP` causes root cupsd crash via negative `job-password-supported`

published 2026-04-07 7 mo ago modified 2026-10-26 13 d ago also EUVD-2026-19805

cvss
4.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits
0
none known

Summary

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.

Patch / fix

  • cups Debian 14 2.4.17-1

debian advisories DEBIAN-CVE-2026-39314

  • cups Ubuntu 22.04 LTS 2.4.1op1-1ubuntu4.20
  • cups Ubuntu 24.04 LTS 2.4.7-1.2ubuntu7.13
  • cups Ubuntu 25.10 2.4.12-0ubuntu3.9
  • cups Ubuntu 26.04 LTS 2.4.16-1ubuntu1.2

ubuntu advisories UBUNTU-CVE-2026-39314

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • cups hummingbird 1 2.4.17-1.hum1
  • cups-lpd hummingbird 1 2.4.17-1.hum1
  • cups-libs hummingbird 1 2.4.17-1.hum1
  • cups-client hummingbird 1 2.4.17-1.hum1
  • cups-ipptool hummingbird 1 2.4.17-1.hum1
  • cups-filesystem hummingbird 1 2.4.17-1.hum1
  • cups-printerapp hummingbird 1 2.4.17-1.hum1

red hat advisories RHSA-2026:8814

  • cups SLE Module for Development Tools 15 SP7, SLE Module for Desktop Applications 15 SP7, SLE Module for Basesystem 15 SP7 +4 more 2.2.7-150000.3.93.1

suse advisories SUSE-SU-2026:2732-1

  • cups openSUSE Tumbleweed 2.4.17-1.1

opensuse advisories openSUSE-SU-2026:10589-1

  • cups Alpine 3.24, Alpine 3.23, Alpine 3.22 +2 more 2.4.18-r0

alpine advisories ALPINE-CVE-2026-39314

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • cups Azure Linux 3.0 2.4.17-1

azure linux advisories AZL-81938

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-39314 updated cvss 4.0

cups: CUPS: Denial of Service via integer underflow in IPP attribute handling

  • Red Hat Enterprise Linux 6 cups, cups-lpd, cups-php, cups-libs
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 cups, cups-lpd, cups-libs, cups-client, cups-ipptool, cups-filesystem Red Hat Enterprise Linux 8 cups, cups-lpd, cups-libs, cups-client, cups-ipptool, cups-filesystem Red Hat Enterprise Linux 9 cups, cups-lpd, cups-libs, cups-client, cups-ipptool, cups-filesystem, +1 more Red Hat Enterprise Linux 10 cups Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images cups 2.4.17-1.hum1, cups-lpd 2.4.17-1.hum1, cups-libs 2.4.17-1.hum1, cups-client 2.4.17-1.hum1, cups-ipptool 2.4.17-1.hum1, cups-filesystem 2.4.17-1.hum1, +1 more
    fixed: vendor fix RHSA-2026:8814

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/OpenPrinting/cups/security/advisories/GHSA-pp8w-2g52-7vj7 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 4.0 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • OpenPrinting cups

Classification

Weakness
  • CWE-191 Integer Underflow (Wrap or Wraparound)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.