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Full vulnerability report · 2026
CVE-2026-87875High confidence

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

Red Hat · Red Hat Hardened Images

Official source article: Red Hat RHSA-2026:66600 ↗. Check the applicable product and release in the original source.

4.3MediumCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 4 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • EPSS is 0.39% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Red Hat Red Hat Hardened Images and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 4 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

5 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 4 affected package states shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcecupsAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourcecupsAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcecupsAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcecupsAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivecupsUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

2 current
CVE-2026-87875 · CSAF 2.0 · revision 10 · interimSUSE Product Security TeamCVE-2026-87875
310 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • cups as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • cups-client as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • cups-devel as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • cups-libs as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • cups-libs-32bit as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • cups as component of SUSE Linux Enterprise High Performance Computing 15 SP1
  • cups-client as component of SUSE Linux Enterprise High Performance Computing 15 SP1
  • cups-config as component of SUSE Linux Enterprise High Performance Computing 15 SP1
  • cups-ddk as component of SUSE Linux Enterprise High Performance Computing 15 SP1
  • cups-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP1
  • libcups2 as component of SUSE Linux Enterprise High Performance Computing 15 SP1
  • libcups2-32bit as component of SUSE Linux Enterprise High Performance Computing 15 SP1
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.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
CVE-2026-87875 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitycups: OpenPrinting CUPS: Heap out-of-bounds read in cupsUTF32ToUTF8() via missing source-length bound
42 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • cups as a component of Red Hat Enterprise Linux 10
  • cups-client as a component of Red Hat Enterprise Linux 10
  • cups-devel as a component of Red Hat Enterprise Linux 10
  • cups-filesystem as a component of Red Hat Enterprise Linux 10
  • cups-ipptool as a component of Red Hat Enterprise Linux 10
  • cups-libs as a component of Red Hat Enterprise Linux 10
  • cups-lpd as a component of Red Hat Enterprise Linux 10
  • cups-printerapp as a component of Red Hat Enterprise Linux 10
  • cups.src as a component of Red Hat Enterprise Linux 10
  • cups as a component of Red Hat Enterprise Linux 6
  • cups-devel as a component of Red Hat Enterprise Linux 6
  • cups-libs as a component of Red Hat Enterprise Linux 6
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.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-75085

No EUVD known-exploited evidence

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.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
4.3 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 4 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

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.

What

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.

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through an adjacent network may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

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.

Why

The product reads data past the end, or before the beginning, of the intended buffer.

How

An attacker operating through an adjacent network may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

CISA Vulnrichment records proof-of-concept exploitation in its SSVC data. BlackTree has not independently executed or validated exploit material.

Likely attack path
an adjacent network → Out-of-bounds Read → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Adjacent
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-125 ↗

CWE-125: Out-of-bounds Read. The product reads data past the end, or before the beginning, of the intended buffer.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVAdjacentAttack vector: The attacker must be on an adjacent or logically close network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CLowConfidentiality impact: A successful attack can cause a limited loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
UnauthenticatedCWE-125Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-75085Official EUVD mapping

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.

Official EUVD record ↗
BSI · German · WID-SEC-2026-3282CUPS: Mehrere Schwachstellen ermöglichen Offenlegung von Informationen

Ein Angreifer aus einem angrenzenden Netzwerk kann mehrere Schwachstellen in CUPS ausnutzen, um Informationen offenzulegen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260916Security Bulletin 16 Sep 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 16 Sep 2026, published on 16 September 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Fixed
Red Hat Hardened Images: 2.4.19-4.1.hum1 < *
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 9 Sept 2026 · Last source change 11 Sept 2026, 23:55 UTC · CWE-125 · Out-of-bounds Read

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-10
European sourceENISA EUVD · EUVD-2026-75085
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceCNA
NVD statusNVD awaiting enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed: added remediation: access.redhat.com/RHSA-2026:66600.
    Before
    no authoritative guidance recorded
    After
    remediation: access.redhat.com/RHSA-2026:66600
    CNA ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    See the vendor and CVE records for the affected range. · Fixed: Red Hat Hardened Images: 2.4.19-4.1.hum1 < *
    CNA ↗
  3. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    CNA ↗
  4. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-87875 to remediation: access.redhat.com/CVE-2026-87875.
    Before
    remediation: access.redhat.com/CVE-2026-87875
    After
    remediation: access.redhat.com/CVE-2026-87875
    Red Hat Product Security ↗
  5. Remediation statusRemediation status changed from Mitigation available to Patch available.
    Before
    Mitigation available
    After
    Patch available
    Red Hat Product Security ↗
  6. Affected versionsThe structured affected or fixed version information changed.
    Before
    cups as a component of Red Hat Enterprise Linux 10; cups-client as a component of Red Hat Enterprise Linux 10; cups-devel as a component of Red Hat Enterprise Linux 10; cups-filesystem as a component of Red Hat Enterprise Linux 10; cups-ipptool as a component of Red Hat Enterprise Linux 10; cups-libs as a component of Red Hat Enterprise Linux 10; cups-lpd as a component of Red Hat Enterprise Linux 10; cups-printerapp as a component of Red Hat Enterprise Linux 10; cups.src as a component of Red Hat Enterprise Linux 10; cups as a component of Red Hat Enterprise Linux 6; cups-devel as a component of Red Hat Enterprise Linux 6; cups-libs as a component of Red Hat Enterprise Linux 6; cups-lpd as a component of Red Hat Enterprise Linux 6; cups-php as a component of Red Hat Enterprise Linux 6; cups.src as a component of Red Hat Enterprise Linux 6; cups as a component of Red Hat Enterprise Linux 7; cups-client as a component of Red Hat Enterprise Linux 7; cups-devel as a component of Red Hat Enterprise Linux 7; cups-filesystem as a component of Red Hat Enterprise Linux 7; cups-ipptool as a component of Red Hat Enterprise Linux 7; cups-libs as a component of Red Hat Enterprise Linux 7; cups-lpd as a component of Red Hat Enterprise Linux 7; cups.src as a component of Red Hat Enterprise Linux 7; cups as a component of Red Hat Enterprise Linux 8; cups-client as a component of Red Hat Enterprise Linux 8; cups-devel as a component of Red Hat Enterprise Linux 8; cups-filesystem as a component of Red Hat Enterprise Linux 8; cups-ipptool as a component of Red Hat Enterprise Linux 8; cups-libs as a component of Red Hat Enterprise Linux 8; cups-lpd as a component of Red Hat Enterprise Linux 8; and 13 more
    After
    cups as a component of Red Hat Enterprise Linux 10; cups-client as a component of Red Hat Enterprise Linux 10; cups-devel as a component of Red Hat Enterprise Linux 10; cups-filesystem as a component of Red Hat Enterprise Linux 10; cups-ipptool as a component of Red Hat Enterprise Linux 10; cups-libs as a component of Red Hat Enterprise Linux 10; cups-lpd as a component of Red Hat Enterprise Linux 10; cups-printerapp as a component of Red Hat Enterprise Linux 10; cups.src as a component of Red Hat Enterprise Linux 10; cups as a component of Red Hat Enterprise Linux 6; cups-devel as a component of Red Hat Enterprise Linux 6; cups-libs as a component of Red Hat Enterprise Linux 6; cups-lpd as a component of Red Hat Enterprise Linux 6; cups-php as a component of Red Hat Enterprise Linux 6; cups.src as a component of Red Hat Enterprise Linux 6; cups as a component of Red Hat Enterprise Linux 7; cups-client as a component of Red Hat Enterprise Linux 7; cups-devel as a component of Red Hat Enterprise Linux 7; cups-filesystem as a component of Red Hat Enterprise Linux 7; cups-ipptool as a component of Red Hat Enterprise Linux 7; cups-libs as a component of Red Hat Enterprise Linux 7; cups-lpd as a component of Red Hat Enterprise Linux 7; cups.src as a component of Red Hat Enterprise Linux 7; cups as a component of Red Hat Enterprise Linux 8; cups-client as a component of Red Hat Enterprise Linux 8; cups-devel as a component of Red Hat Enterprise Linux 8; cups-filesystem as a component of Red Hat Enterprise Linux 8; cups-ipptool as a component of Red Hat Enterprise Linux 8; cups-libs as a component of Red Hat Enterprise Linux 8; cups-lpd as a component of Red Hat Enterprise Linux 8; and 12 more · Fixed: cups-main@aarch64 as a component of Red Hat Hardened Images; cups-main@noarch as a component of Red Hat Hardened Images; cups-main@src as a component of Red Hat Hardened Images; cups-main@x86_64 as a component of Red Hat Hardened Images
    Red Hat Product Security ↗
  7. ENISA EUVD mappingEUVD-2026-75085 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-75085"}
    ENISA EUVD ↗
  8. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-87875 to remediation: access.redhat.com/CVE-2026-87875.
    Before
    remediation: access.redhat.com/CVE-2026-87875
    After
    remediation: access.redhat.com/CVE-2026-87875
    Red Hat Product Security ↗
  9. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    Red Hat Product Security ↗
  10. Public exploit evidencePublic exploit evidence changed from No public exploit to Public exploit reference.
    Before
    No public exploit
    After
    Public exploit reference
    CVE.org ↗
  11. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-75085↗Vendor CSAF · SUSE Product Security Team↗CISA Vulnrichment SSVC evidence↗CVE authority or vendor reference · Red Hat RHSA-2026:66600↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-87875 · cve.blacktree.nl