Vulnerability-Lookup

RHSA-2026:67568

Vulnerability from csaf_redhat - Published: 2026-09-15 13:47 - Updated: 2026-10-22 05:51

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Low

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: cups: * cups-2.4.19-4.2.hum1 (aarch64, x86_64) * cups-client-2.4.19-4.2.hum1 (aarch64, x86_64) * cups-devel-2.4.19-4.2.hum1 (aarch64, x86_64) * cups-filesystem-2.4.19-4.2.hum1 (noarch) * cups-ipptool-2.4.19-4.2.hum1 (aarch64, x86_64) * cups-libs-2.4.19-4.2.hum1 (aarch64, x86_64) * cups-lpd-2.4.19-4.2.hum1 (aarch64, x86_64) * cups-printerapp-2.4.19-4.2.hum1 (aarch64, x86_64) * cups-2.4.19-4.2.hum1.src (src) Security Fix(es): cups: * CVE-2026-87876

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-87876

Two case-insensitive comparisons on request-derived usernames outside the main authorization path in CUPS's scheduler (printer ACL validation and private-attribute filtering) could allow bypass of username-based access controls in certain configurations.

3.0 (Low)


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

CWE-178 - Improper Handling of Case Sensitivity

Affected products

Fixed 17 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:cups-1:2.4.19-4.2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-1:2.4.19-4.2.hum1@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-1:2.4.19-4.2.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-client-1:2.4.19-4.2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-client-1:2.4.19-4.2.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-devel-1:2.4.19-4.2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-devel-1:2.4.19-4.2.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-filesystem-1:2.4.19-4.2.hum1@noarch@public-hummingbird-aarch64-rpms	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-filesystem-1:2.4.19-4.2.hum1@noarch@public-hummingbird-x86_64-rpms	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-ipptool-1:2.4.19-4.2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-ipptool-1:2.4.19-4.2.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-libs-1:2.4.19-4.2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-libs-1:2.4.19-4.2.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-lpd-1:2.4.19-4.2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-lpd-1:2.4.19-4.2.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-printerapp-1:2.4.19-4.2.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-printerapp-1:2.4.19-4.2.hum1@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Low

References

12 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:67568	self
https://access.redhat.com/security/cve/CVE-2026-87876	external
https://access.redhat.com/security/updates/classi…	external
https://images.redhat.com/	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-87876	self
https://bugzilla.redhat.com/show_bug.cgi?id=2530991	external
https://www.cve.org/CVERecord?id=CVE-2026-87876	external
https://nvd.nist.gov/vuln/detail/CVE-2026-87876	external
https://github.com/OpenPrinting/cups/commit/88e67…	external
https://github.com/OpenPrinting/cups/commit/f5684…	external
https://github.com/OpenPrinting/cups/security/adv…	external

Acknowledgments

Independent Security Researcher arbor-s

JSON

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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "arbor-s"
          ],
          "organization": "Independent Security Researcher"
        }
      ],
      "cve": "CVE-2026-87876",
      "cwe": {
        "id": "CWE-178",
        "name": "Improper Handling of Case Sensitivity"
      },
      "discovery_date": "2026-08-25T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2530991"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "Two case-insensitive comparisons on request-derived usernames outside the main authorization path in CUPS\u0027s scheduler (printer ACL validation and private-attribute filtering) could allow bypass of username-based access controls in certain configurations.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "cups: OpenPrinting CUPS: Remaining case-insensitive username matching in scheduler side paths (CVE-2026-27447 follow-up)",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Two case-insensitive comparisons on request-derived usernames remain in the CUPS scheduler outside the main authorization path, in the printer ACL validation logic (check_quotas() in scheduler/ipp.c) and the private-attribute filtering logic (cupsdGetPrivateAttrs() in scheduler/policy.c), and were not addressed by the fix for CVE-2026-27447. In certain configurations, an authenticated attacker on the adjacent network could use these comparisons to bypass username-based access controls and access information protected by those controls, resulting in a limited loss of confidentiality with no impact on integrity or availability. Red Hat and upstream both rate this flaw LOW severity (CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N), as exploitation requires an adjacent-network position, an authenticated low-privilege account, and user interaction. The cups component in Red Hat Enterprise Linux, Red Hat OpenShift Container Platform (RHCOS), and Red Hat In-Vehicle OS is affected, with the fix deferred to a future update; given the low severity rating and the prerequisites for exploitation, the residual risk of deferring the fix is considered limited. Fedora and Red Hat Hardened Images are also affected: the Fedora fix is being pursued with the community, and a fix has already been delivered for Red Hat Hardened Images.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "Red Hat Hardened Images:cups-printerapp-1:2.4.19-4.2.hum1@x86_64"
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-87876"
        },
        {
          "category": "external",
          "summary": "RHBZ#2530991",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2530991"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-87876",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-87876"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-87876",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-87876"
        },
        {
          "category": "external",
          "summary": "https://github.com/OpenPrinting/cups/commit/88e67c00c130a45f3a1edf36686f7a0b2982fef8",
          "url": "https://github.com/OpenPrinting/cups/commit/88e67c00c130a45f3a1edf36686f7a0b2982fef8"
        },
        {
          "category": "external",
          "summary": "https://github.com/OpenPrinting/cups/commit/f56844dbe4a54a9f8e1aeb3b913fbee614156bdb",
          "url": "https://github.com/OpenPrinting/cups/commit/f56844dbe4a54a9f8e1aeb3b913fbee614156bdb"
        },
        {
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          "summary": "https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2",
          "url": "https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2"
        }
      ],
      "release_date": "2026-09-09T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-15T13:47:12+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
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            "Red Hat Hardened Images:cups-printerapp-1:2.4.19-4.2.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:67568"
        },
        {
          "category": "workaround",
          "details": "Fixed on upstream master branch with commit f56844d and for versions 2.4.x with commit 88e67c0.",
          "product_ids": [
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            "Red Hat Hardened Images:cups-client-1:2.4.19-4.2.hum1@x86_64",
            "Red Hat Hardened Images:cups-devel-1:2.4.19-4.2.hum1@aarch64",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.0,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "products": [
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            "Red Hat Hardened Images:cups-devel-1:2.4.19-4.2.hum1@x86_64",
            "Red Hat Hardened Images:cups-filesystem-1:2.4.19-4.2.hum1@noarch@public-hummingbird-aarch64-rpms",
            "Red Hat Hardened Images:cups-filesystem-1:2.4.19-4.2.hum1@noarch@public-hummingbird-x86_64-rpms",
            "Red Hat Hardened Images:cups-ipptool-1:2.4.19-4.2.hum1@aarch64",
            "Red Hat Hardened Images:cups-ipptool-1:2.4.19-4.2.hum1@x86_64",
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            "Red Hat Hardened Images:cups-libs-1:2.4.19-4.2.hum1@x86_64",
            "Red Hat Hardened Images:cups-lpd-1:2.4.19-4.2.hum1@aarch64",
            "Red Hat Hardened Images:cups-lpd-1:2.4.19-4.2.hum1@x86_64",
            "Red Hat Hardened Images:cups-printerapp-1:2.4.19-4.2.hum1@aarch64",
            "Red Hat Hardened Images:cups-printerapp-1:2.4.19-4.2.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "cups: OpenPrinting CUPS: Remaining case-insensitive username matching in scheduler side paths (CVE-2026-27447 follow-up)"
    }
  ]
}

CVE-2026-87876 (GCVE-0-2026-87876)

Vulnerability from cvelistv5 – Published: 2026-09-09 16:12 – Updated: 2026-10-21 20:07

Title

Cups: openprinting cups: remaining case-insensitive username matching in scheduler side paths (cve-2026-27447 follow-up)

Summary

Severity

3 (Low)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-09 18:09 UTC

CWE

CWE-178 - Improper Handling of Case Sensitivity

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1039 records in the last 180 days details

References

6 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:67568	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-87876	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2530991	issue-trackingx_refsource_REDHAT
https://github.com/OpenPrinting/cups/commit/88e67…
https://github.com/OpenPrinting/cups/commit/f5684…
https://github.com/OpenPrinting/cups/security/adv…

Impacted products

7 products

Vendor	Product	Version
Red Hat	Red Hat Hardened Images	Unaffected: 2.4.19-4.2.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2026-09-09 00:00

Credits

Red Hat would like to thank arbor-s (Independent Security Researcher) for reporting this issue.

Show details on NVD website

JSON

To clipboard

{
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                "options": [
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                    "Exploitation": "poc"
                  },
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-09T18:09:43.830591Z",
                "version": "2.0.3"
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        "providerMetadata": {
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            "url": "https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2"
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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