Vulnerability-Lookup

RHSA-2026:77638

Vulnerability from csaf_redhat - Published: 2026-10-07 13:43 - Updated: 2026-10-07 17:19

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-2.4.19-4.3.hum1 (aarch64, x86_64) * cups-client-2.4.19-4.3.hum1 (aarch64, x86_64) * cups-devel-2.4.19-4.3.hum1 (aarch64, x86_64) * cups-filesystem-2.4.19-4.3.hum1 (noarch) * cups-ipptool-2.4.19-4.3.hum1 (aarch64, x86_64) * cups-libs-2.4.19-4.3.hum1 (aarch64, x86_64) * cups-lpd-2.4.19-4.3.hum1 (aarch64, x86_64) * cups-printerapp-2.4.19-4.3.hum1 (aarch64, x86_64) * cups-2.4.19-4.3.hum1.src (src) Security Fix(es): cups: * CVE-2026-105326

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-2026-105326

An argument injection flaw was found in CUPS. When email notification is configured, the CUPS scheduler accepts printer subscription requests that supply a mailto notify-recipient-uri. The mailto notifier passes the recipient address to the configured sendmail program without ensuring it cannot be interpreted as command-line options. A remote attacker who can reach the CUPS service could supply a crafted recipient value starting with "-" to influence sendmail behavior. Successful exploitation depends on the installed mail transfer agent and CUPS network exposure, and may lead to execution of attacker-controlled commands with the privileges of the CUPS service user.

2.5 (Low)


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

CWE-88 - Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

Affected products

Fixed 18 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:cups-0:2.4.19-4.3.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-0:2.4.19-4.3.hum1@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-0:2.4.19-4.3.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-client-0:2.4.19-4.3.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-client-0:2.4.19-4.3.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-devel-0:2.4.19-4.3.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-devel-0:2.4.19-4.3.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-filesystem-0:2.4.19-4.3.hum1@noarch@public-hummingbird-aarch64-rpms	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-filesystem-0:2.4.19-4.3.hum1@noarch@public-hummingbird-s390x-rpms	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-filesystem-0:2.4.19-4.3.hum1@noarch@public-hummingbird-x86_64-rpms	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-ipptool-0:2.4.19-4.3.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-ipptool-0:2.4.19-4.3.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-libs-0:2.4.19-4.3.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-libs-0:2.4.19-4.3.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-lpd-0:2.4.19-4.3.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-lpd-0:2.4.19-4.3.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-printerapp-0:2.4.19-4.3.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:cups-printerapp-0:2.4.19-4.3.hum1@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Low

References

12 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:77638	self
https://access.redhat.com/security/cve/CVE-2026-105326	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-2026-105326	self
https://bugzilla.redhat.com/show_bug.cgi?id=2545835	external
https://www.cve.org/CVERecord?id=CVE-2026-105326	external
https://nvd.nist.gov/vuln/detail/CVE-2026-105326	external
https://github.com/OpenPrinting/cups/commit/1244ed9	external
https://github.com/OpenPrinting/cups/commit/611d1bd	external
https://github.com/OpenPrinting/cups/security/adv…	external

JSON

To clipboard

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  "vulnerabilities": [
    {
      "cve": "CVE-2026-105326",
      "cwe": {
        "id": "CWE-88",
        "name": "Improper Neutralization of Argument Delimiters in a Command (\u0027Argument Injection\u0027)"
      },
      "discovery_date": "2026-09-13T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2545835"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "An argument injection flaw was found in CUPS. When email notification is configured, the CUPS scheduler accepts printer subscription requests that supply a mailto notify-recipient-uri. The mailto notifier passes the recipient address to the configured sendmail program without ensuring it cannot be interpreted as command-line options. A remote attacker who can reach the CUPS service could supply a crafted recipient value starting with \"-\" to influence sendmail behavior. Successful exploitation depends on the installed mail transfer agent and CUPS network exposure, and may lead to execution of attacker-controlled commands with the privileges of the CUPS service user.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "cups: cups: argument injection in mailto notifier via notify-recipient-uri",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is rated Low because exploitation requires multiple environmental conditions beyond the CUPS code flaw alone. The vulnerable mailto notifier logic is present in CUPS packages shipped in Red Hat Enterprise Linux, but practical impact on RHEL is limited: RHEL typically provides Postfix\u0027s sendmail-compatible wrapper, which does not support the traditional sendmail -C configuration option used in public proof-of-concept chains, and many systems do not install or enable an MTA for CUPS notifications. By default, cupsd listens only on the local loopback interface unless administrators explicitly configure remote access. Create-Printer-Subscription is allowed for unauthenticated clients only under the default policy when cupsd is configured to accept remote IPP; operators can reduce exposure by restricting network access to the printing service and disabling mail notifications if unused. Red Hat is tracking upstream fixes and will publish updated CUPS packages when available.",
          "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-0:2.4.19-4.3.hum1@x86_64"
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      "references": [
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-105326"
        },
        {
          "category": "external",
          "summary": "RHBZ#2545835",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2545835"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-105326",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-105326"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-105326",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-105326"
        },
        {
          "category": "external",
          "summary": "https://github.com/OpenPrinting/cups/commit/1244ed9",
          "url": "https://github.com/OpenPrinting/cups/commit/1244ed9"
        },
        {
          "category": "external",
          "summary": "https://github.com/OpenPrinting/cups/commit/611d1bd",
          "url": "https://github.com/OpenPrinting/cups/commit/611d1bd"
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        {
          "category": "external",
          "summary": "https://github.com/OpenPrinting/cups/security/advisories/GHSA-r4wf-366f-f6g3",
          "url": "https://github.com/OpenPrinting/cups/security/advisories/GHSA-r4wf-366f-f6g3"
        }
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      "release_date": "2026-10-05T08:00:00+00:00",
      "remediations": [
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          "category": "vendor_fix",
          "date": "2026-10-07T13:43:18+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-0:2.4.19-4.3.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:77638"
        },
        {
          "category": "workaround",
          "details": "Restrict network access to the CUPS service (port 631/tcp) to trusted hosts only, and avoid exposing cupsd to untrusted networks. If email notifications are not required, do not configure mailto subscriptions or remove/disable the mailto notifier. Ensure only a trusted mail transfer agent is installed and referenced from CUPS mailto configuration. Monitor for unexpected printer subscriptions and unusual sendmail activity from the lp user.",
          "product_ids": [
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 2.5,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "products": [
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            "Red Hat Hardened Images:cups-0:2.4.19-4.3.hum1@src",
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            "Red Hat Hardened Images:cups-filesystem-0:2.4.19-4.3.hum1@noarch@public-hummingbird-s390x-rpms",
            "Red Hat Hardened Images:cups-filesystem-0:2.4.19-4.3.hum1@noarch@public-hummingbird-x86_64-rpms",
            "Red Hat Hardened Images:cups-ipptool-0:2.4.19-4.3.hum1@aarch64",
            "Red Hat Hardened Images:cups-ipptool-0:2.4.19-4.3.hum1@x86_64",
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            "Red Hat Hardened Images:cups-libs-0:2.4.19-4.3.hum1@x86_64",
            "Red Hat Hardened Images:cups-lpd-0:2.4.19-4.3.hum1@aarch64",
            "Red Hat Hardened Images:cups-lpd-0:2.4.19-4.3.hum1@x86_64",
            "Red Hat Hardened Images:cups-printerapp-0:2.4.19-4.3.hum1@aarch64",
            "Red Hat Hardened Images:cups-printerapp-0:2.4.19-4.3.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "cups: cups: argument injection in mailto notifier via notify-recipient-uri"
    }
  ]
}

CVE-2026-105326 (GCVE-0-2026-105326)

Vulnerability from cvelistv5 – Published: 2026-10-05 18:58 – Updated: 2026-10-07 17:20

Title

Cups: cups: argument injection in mailto notifier via notify-recipient-uri

Summary

Severity

2.5 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-06 14:43 UTC

CWE

CWE-88 - Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

Assigner

redhat CNA under the redhat root

CNA scorecard B 81/100 over 973 records in the last 180 days details

References

6 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:77638	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-105326	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2545835	issue-trackingx_refsource_REDHAT
https://github.com/OpenPrinting/cups/commit/1244ed9
https://github.com/OpenPrinting/cups/commit/611d1bd
https://github.com/OpenPrinting/cups/security/adv…

Impacted products

4 products

Vendor	Product	Version
Red Hat	Red Hat Hardened Images	Unaffected: 2.4.19-4.3.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 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

Date Public

2026-10-05 08:00

Show details on NVD website

JSON

To clipboard

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                  {
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                "role": "CISA Coordinator",
                "timestamp": "2026-10-06T14:43:04.210560Z",
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          ],
          "defaultStatus": "affected",
          "packageName": "cups-main",
          "product": "Red Hat Hardened Images",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "2.4.19-4.3.hum1",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:10"
          ],
          "defaultStatus": "affected",
          "packageName": "cups",
          "product": "Red Hat Enterprise Linux 10",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:8"
          ],
          "defaultStatus": "affected",
          "packageName": "cups",
          "product": "Red Hat Enterprise Linux 8",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:9"
          ],
          "defaultStatus": "affected",
          "packageName": "cups",
          "product": "Red Hat Enterprise Linux 9",
          "vendor": "Red Hat"
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:9"
          ],
          "defaultStatus": "affected",
          "packageName": "rhel9/cups",
          "product": "Red Hat Enterprise Linux 9",
          "vendor": "Red Hat"
        }
      ],
      "datePublic": "2026-10-05T08:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "An argument injection flaw was found in CUPS. When email notification is configured, the CUPS scheduler accepts printer subscription requests that supply a mailto notify-recipient-uri. The mailto notifier passes the recipient address to the configured sendmail program without ensuring it cannot be interpreted as command-line options. A remote attacker who can reach the CUPS service could supply a crafted recipient value starting with \"-\" to influence sendmail behavior. Successful exploitation depends on the installed mail transfer agent and CUPS network exposure, and may lead to execution of attacker-controlled commands with the privileges of the CUPS service user."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "namespace": "https://access.redhat.com/security/updates/classification/",
              "value": "Low"
            },
            "type": "Red Hat severity rating"
          }
        },
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 2.5,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-88",
              "description": "Improper Neutralization of Argument Delimiters in a Command (\u0027Argument Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-07T17:20:06.153Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
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          "name": "RHSA-2026:77638",
          "tags": [
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            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:77638"
        },
        {
          "tags": [
            "vdb-entry",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/security/cve/CVE-2026-105326"
        },
        {
          "name": "RHBZ#2545835",
          "tags": [
            "issue-tracking",
            "x_refsource_REDHAT"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2545835"
        },
        {
          "url": "https://github.com/OpenPrinting/cups/commit/1244ed9"
        },
        {
          "url": "https://github.com/OpenPrinting/cups/commit/611d1bd"
        },
        {
          "url": "https://github.com/OpenPrinting/cups/security/advisories/GHSA-r4wf-366f-f6g3"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-09-13T00:00:00.000Z",
          "value": "Reported to Red Hat."
        },
        {
          "lang": "en",
          "time": "2026-10-05T08:00:00.000Z",
          "value": "Made public."
        }
      ],
      "title": "Cups: cups: argument injection in mailto notifier via notify-recipient-uri",
      "workarounds": [
        {
          "lang": "en",
          "value": "Restrict network access to the CUPS service (port 631/tcp) to trusted hosts only, and avoid exposing cupsd to untrusted networks. If email notifications are not required, do not configure mailto subscriptions or remove/disable the mailto notifier. Ensure only a trusted mail transfer agent is installed and referenced from CUPS mailto configuration. Monitor for unexpected printer subscriptions and unusual sendmail activity from the lp user."
        }
      ],
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_redhatCweChain": "CWE-88: Improper Neutralization of Argument Delimiters in a Command (\u0027Argument Injection\u0027)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2026-105326",
    "datePublished": "2026-10-05T18:58:56.161Z",
    "dateReserved": "2026-10-05T08:47:01.523Z",
    "dateUpdated": "2026-10-07T17:20:06.153Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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.

Action not permitted

RHSA-2026:77638

CVE-2026-105326 (GCVE-0-2026-105326)

Tags

Sightings

Nomenclature

Related by attack behaviour