CVE-2026-34990

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{"affected": [{"affectedData": [{"product": "cups", "vendor": "OpenPrinting", "versions": [{"status": "affected", "version": "<= 2.4.16"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:openprinting:cups:*:*:*:*:*:*:*:*", "matchCriteriaId": "8A2A4507-B2D7-43B8-B008-6EC2F5053FA9", "versionEndIncluding": "2.4.16", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, a local unprivileged user can coerce cupsd into authenticating to an attacker-controlled localhost IPP service with a reusable Authorization: Local ... token. That token is enough to drive /admin/ requests on localhost, and the attacker can combine CUPS-Create-Local-Printer with printer-is-shared=true to persist a file:///... queue even though the normal FileDevice policy rejects such URIs. Printing to that queue gives an arbitrary root file overwrite; the PoC below uses that primitive to drop a sudoers fragment and demonstrate root command execution. At time of publication, there are no publicly available patches."}, {"lang": "es", "value": "OpenPrinting CUPS es un sistema de impresi\u00f3n de c\u00f3digo abierto para Linux y otros sistemas operativos tipo Unix. En las versiones 2.4.16 y anteriores, un usuario local sin privilegios puede forzar a cupsd a autenticarse en un servicio IPP de localhost controlado por el atacante con un token de Autorizaci\u00f3n: Local ... reutilizable. Ese token es suficiente para impulsar solicitudes /admin/ en localhost, y el atacante puede combinar CUPS-Create-Local-Printer con printer-is-shared=true para persistir una cola file:///... aunque la pol\u00edtica normal de FileDevice rechaza tales URIs. Imprimir en esa cola permite una sobrescritura arbitraria de archivos de root; el PoC a continuaci\u00f3n utiliza esa primitiva para soltar un fragmento de sudoers y demostrar la ejecuci\u00f3n de comandos como root. En el momento de la publicaci\u00f3n, no hay parches disponibles p\u00fablicamente."}], "id": "CVE-2026-34990", "lastModified": "2026-07-24T21:10:00.143", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.0, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-34990", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-04-06T18:51:42.773546Z", "version": "2.0.3"}}]}, "published": "2026-04-03T22:16:27.400", "references": [{"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/OpenPrinting/cups/security/advisories/GHSA-c54j-2vqw-wpwp"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-287"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "cups: OpenPrinting CUPS: Privilege escalation via arbitrary file overwrite due to coerced authentication", "id": "2454947", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454947"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.2", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-73", "details": ["A flaw was found in OpenPrinting CUPS. A local unprivileged user can exploit this vulnerability by coercing the `cupsd` service to authenticate to an attacker-controlled Internet Printing Protocol (IPP) service. This allows the user to create a persistent printer queue that can overwrite arbitrary files with root privileges. Successful exploitation can lead to privilege escalation and arbitrary root command execution."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-34990", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "cups", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "cups", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "cups", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "cups", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "cups", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-04-03T21:14:09Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34990\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34990\nhttps://github.com/OpenPrinting/cups/security/advisories/GHSA-c54j-2vqw-wpwp"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.4.16]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "cups", "source": "cna", "vendor": "OpenPrinting"}, "product": "cups", "vendor": "openprinting"}], "analysis": {"en": {"generated_at": "2026-04-04T03:52:32.291921+00:00", "value": {"mitigation_remediation": ["Seek and apply vendor patch once released.", "Limit local users\u2019 permissions to create printers; configure the system to deny the use of file:// URIs for printers.", "Disable or restrict local IPP authentication for non\u2011trusted sources.", "Monitor the system for unauthorized printer creation and ensure FileDevice policies are correctly enforced.", "Consider disabling the CUPS service on hosts where service is unnecessary."], "summary": {"action": "Apply patch", "impact": "Root-level file overwrite leading to privilege escalation"}, "threat_synthesis": {"affected_systems": "OpenPrinting CUPS 2.4.16 and earlier running on Linux or other Unix\u2011like operating systems are affected. This includes any distribution that ships the 2.4.16 release or older versions of CUPS.", "description_and_impact": "The vulnerability appears in OpenPrinting CUPS versions 2.4.16 and earlier. An unprivileged local user can trick the CUPS server into authenticating to a malicious localhost IPP service using a reusable Local token. That token allows the attacker to make administrative requests on localhost, and by creating a shared local printer with a file:// URI, the attacker can persist a malicious queue. Printing to that queue triggers an arbitrary root file overwrite, which the proof\u2011of\u2011concept shows can drop a sudoers fragment and execute commands with root privileges. The weakness involves authentication bypass (CWE-287) and path manipulation (CWE-73).", "risk_and_exploitability": "The CVSS score of 5.0 denotes a moderate risk. The EPSS score is not available and the vulnerability is not listed in the CISA KEV catalog, suggesting it may not yet be widely exploited. However, the attack requires only local, unprivileged user access, making the exploitation barrier low within a compromised host. Once authenticated via the Local token, administrative actions on the CUPS server can be performed, allowing the attacker to persist malicious printers and achieve root-level file overwrite."}}}}, "created": "2026-04-06T21:22:32.759629+00:00", "updated": "2026-04-06T22:22:10.838533+00:00", "vendors": ["openprinting", "openprinting$PRODUCT$cups"]}