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Fencer Intel
medium 4.3

CVE-2026-87875 json

Cups: openprinting cups: heap out-of-bounds read in cupsutf32toutf8() via missing source-length bound

published 2mo ago modified 6d ago also EUVD-2026-75085 , GHSA-559w-7676-3xrq

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository OpenPrinting/cups. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

Summary

The cupsUTF32ToUTF8() function in CUPS's cups/transcode.c lacks a source-length bound and can read past the end of the source buffer, resulting in a heap out-of-bounds read. This is reachable via SNMP supply-description parsing in backend/snmp-supplies.c with attacker-controlled content.

Patch / fix

  • Red Hat Red Hat Hardened Images 2.4.19-4.1.hum1
  • cups Debian 14 2.4.20-1

debian advisories DEBIAN-CVE-2026-87875

  • cups hummingbird 1 2.4.19-4.1.hum1
  • cups-lpd hummingbird 1 2.4.19-4.1.hum1
  • cups-libs hummingbird 1 2.4.19-4.1.hum1
  • cups-client hummingbird 1 2.4.19-4.1.hum1
  • cups-ipptool hummingbird 1 2.4.19-4.1.hum1
  • cups-filesystem hummingbird 1 2.4.19-4.1.hum1
  • cups-printerapp hummingbird 1 2.4.19-4.1.hum1

red hat advisories RHSA-2026:66600

  • cups SLE Module for Development Tools 15 SP7, SLE Module for Desktop Applications 15 SP7, SLE Module for Basesystem 15 SP7 +3 more 2.2.7-150000.3.96.1
  • cups Linux Micro 6.0 2.4.19-2.1
  • cups Linux Micro 6.1 2.4.19-slfo.1.1_2.1
  • cups SLES LTSS Extended Security 12 SP5 1.7.5-20.70.1

suse advisories SUSE-SU-2026:4281-1SUSE-SU-2026:23877-1SUSE-SU-2026:23925-1SUSE-SU-2026:4216-1

  • cups openSUSE Leap 16.0 2.4.19-160000.2.1
  • cups openSUSE Tumbleweed 2.4.19-3.1

opensuse advisories openSUSE-SU-2026:21893-1openSUSE-SU-2026:11785-1

  • cups Azure Linux 3.0 2.4.19-2

azure linux advisories AZL-100920

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

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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-2026-87875 updated cvss 4.3

cups: OpenPrinting CUPS: Heap out-of-bounds read in cupsUTF32ToUTF8() via missing source-length bound

  • Red Hat Enterprise Linux 6 cups, cups-lpd, cups-php, cups-libs, cups 2.4.10-18.el10_2 Red Hat Enterprise Linux 7 cups, cups-lpd, cups-libs, cups-client, cups-ipptool, cups-filesystem, +1 more Red Hat Enterprise Linux 8 cups, cups-lpd, cups-libs, cups-client, cups-ipptool, cups-filesystem, +1 more Red Hat Enterprise Linux 9 cups, cups-lpd, cups-libs, rhel9/cups, cups-client, cups-ipptool, +3 more Red Hat Enterprise Linux 10 cups 2.4.10-18.el10_2 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8
    affected: workaround, no fix available “Fixed on upstream master branch with commit 0c6842f and for versions 2.4.x with commit 2b1dc17.”
  • Red Hat Hardened Images cups 2.4.19-4.1.hum1, cups-lpd 2.4.19-4.1.hum1, cups-libs 2.4.19-4.1.hum1, cups-client 2.4.19-4.1.hum1, cups-ipptool 2.4.19-4.1.hum1, cups-filesystem 2.4.19-4.1.hum1, +1 more
    fixed: vendor fix “Fixed on upstream master branch with commit 0c6842f and for versions 2.4.x with commit 2b1dc17.” RHSA-2026:66600

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
2mo ago

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/OpenPrinting/cups/security/advisories/GHSA-559w-7676-3xrq referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • 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 OpenShift Container Platform 4

Classification

Weakness

References

Sources

Fencer Intel 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.

The maintainers of OpenPrinting/cups published their own advisory on GitHub. Reviewed sources take precedence over it.