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NVD / CVE Program· CNA redhat

CVE-2026-87875: Cups: openprinting cups: heap out-of-bounds read in cupsutf32toutf8() via missing source-length bound

Noroxi assessment

Priority: Monitor (action score 17/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.39% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: azl3 cups 2.4.19-1 on Azure Linux 3.0 2.4.19-2.

Low priority for now. Upgrade to azl3 cups 2.4.19-1 on Azure Linux 3.0 2.4.19-2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 4.3 · v3.1—No exploit Fix available
Published
Sep 9, 2026
Updated
Nov 6, 2026
EPSS
0.3% · 33th percentile

Report tools

JSON

Action score

17

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
4.3
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 10

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 9

    • all versionsaffected
    • all versionsaffected

  • Red Hat Red Hat Hardened Images

    • 2.4.19-4.1.hum1 and laternot affected · rpm

  • Red Hat Red Hat OpenShift Container Platform 4

    • all versionsaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12cupsfrom 0—
openSUSE:Leap 16.0cupsbefore 2.4.19-160000.2.12.4.19-160000.2.1
openSUSE:Tumbleweedcupsbefore 2.4.19-3.12.4.19-3.1
Red Hat:hummingbird:1cupsbefore 0:2.4.19-4.1.hum10:2.4.19-4.1.hum1
Red Hat:hummingbird:1cups-clientbefore 0:2.4.19-4.1.hum10:2.4.19-4.1.hum1
Red Hat:hummingbird:1cups-develbefore 0:2.4.19-4.1.hum10:2.4.19-4.1.hum1
Red Hat:hummingbird:1cups-filesystembefore 0:2.4.19-4.1.hum10:2.4.19-4.1.hum1
Red Hat:hummingbird:1cups-ipptoolbefore 0:2.4.19-4.1.hum10:2.4.19-4.1.hum1
Red Hat:hummingbird:1cups-libsbefore 0:2.4.19-4.1.hum10:2.4.19-4.1.hum1
Red Hat:hummingbird:1cups-lpdbefore 0:2.4.19-4.1.hum10:2.4.19-4.1.hum1
Red Hat:hummingbird:1cups-printerappbefore 0:2.4.19-4.1.hum10:2.4.19-4.1.hum1
SUSE:Linux Enterprise Micro 5.3cupsbefore 2.2.7-150000.3.96.12.2.7-150000.3.96.1
SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5cupsbefore 1.7.5-20.70.11.7.5-20.70.1
SUSE:Linux Micro 6.0cupsbefore 2.4.19-2.12.4.19-2.1
SUSE:Linux Micro 6.1cupsbefore 2.4.19-slfo.1.1_2.12.4.19-slfo.1.1_2.1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-90954Busybox: busybox: dpkg-deb extraction-root escape via per-ar-member deferred symlink flush
    31Monitor
  • CVE-2026-96512Sudo: sudo: tz environment variable allows bypass of notbefore/notafter time-based authorization
    31Monitor
  • CVE-2026-78410Util-linux: util-linux: restricted bind mounts do not pin the source, allowing x-mount.owner/group/mode redirection
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-78408Sep 2, 2026 · Util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority
    31Monitor
  • ← EarlierCVE-2026-78409Sep 2, 2026 · Util-linux: util-linux: x-mount.subdir detached-tree resolution can escape via intermediate symlinks
    28Monitor
  • Later →CVE-2026-87876Sep 9, 2026 · Cups: openprinting cups: remaining case-insensitive username matching in scheduler side paths (cve-2026-27447 follow-up)
    12Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 cups 2.4.19-1 on Azure Linux 3.02.4.19-2 · Release NotesMicrosoft (MSRC)
opensuse:cups2.4.19-3.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:cups0:2.4.19-4.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:cups-client0:2.4.19-4.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:cups-devel0:2.4.19-4.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:cups-filesystem0:2.4.19-4.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:cups-ipptool0:2.4.19-4.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:cups-libs0:2.4.19-4.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:cups-lpd0:2.4.19-4.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:cups-printerapp0:2.4.19-4.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
suse:cups2.4.19-2.1 · SUSE:Linux Micro 6.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-8883514 days apartBusybox: busybox: dpkg read_package_field() steps past nul terminator, causing out-of-bounds read on malformed .deb packages
    24Monitor
  • CVE-2026-1500344 days apartBinutils: gnu binutils: heap-buffer-overflow in linker leads to information disclosure and denial of service
    22Monitor
  • CVE-2026-436785 days apartLibxpm: libxpm: denial of service via out-of-bounds read in xpm file parsing
    22Monitor
  • CVE-2026-8884014 days apartBusybox: busybox: tls ssl_server reads one byte out of bounds when parsing truncated clienthello
    21Monitor
  • CVE-2026-8549850 days apartPolkit: regression in cve-2026-4897 fix (polkit read_cookie()) - stack buffer underflow
    14Monitor
  • CVE-2026-8884235 days apartBusybox: busybox: dpkg stale field_start pointer causes out-of-bounds read and status file corruption
    13Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

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Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records