CVE-2025-26595

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El c\u00f3digo no verifica los l\u00edmites del b\u00fafer y copia los datos independientemente del tama\u00f1o."}], "id": "CVE-2025-26595", "lastModified": "2026-11-04T22:17:30.020", "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": "secalert@redhat.com", "type": "Secondary"}, {"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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-26595", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-02-25T20:05:05.924947Z", "version": "2.0.3"}}]}, "published": "2025-02-25T16:15:38.390", "references": [{"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2025:2500"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2025:2502"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2025:2861"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2025:2862"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2025:2865"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2025:2866"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2025:2873"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2025:2874"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2025:2875"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2025:2879"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2025:2880"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:3976"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:7163"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:7165"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:7458"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2025-26595"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2345257"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/02/msg00036.html"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-121"}], "source": "secalert@redhat.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2025:7458", "cpe": "cpe:/o:redhat:enterprise_linux:10.0", "package": "xorg-x11-server-Xwayland-0:24.1.5-3.el10_0", "product_name": "Red Hat Enterprise Linux 10", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:2861", "cpe": "cpe:/o:redhat:rhel_els:7", "package": "tigervnc-0:1.8.0-36.el7_9", "product_name": "Red Hat Enterprise Linux 7 Extended Lifecycle Support", "release_date": "2025-03-17T00:00:00Z"}, {"advisory": "RHSA-2025:2879", "cpe": "cpe:/o:redhat:rhel_els:7", "package": "xorg-x11-server-0:1.20.4-30.el7_9", "product_name": "Red Hat Enterprise Linux 7 Extended Lifecycle Support", "release_date": "2025-03-17T00:00:00Z"}, {"advisory": "RHSA-2025:2502", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "tigervnc-0:1.13.1-15.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-03-10T00:00:00Z"}, {"advisory": "RHSA-2025:2866", "cpe": "cpe:/a:redhat:rhel_aus:8.2", "package": "tigervnc-0:1.9.0-15.el8_2.13", "product_name": "Red Hat Enterprise Linux 8.2 Advanced Update Support", "release_date": "2025-03-17T00:00:00Z"}, {"advisory": "RHSA-2025:2865", "cpe": "cpe:/a:redhat:rhel_aus:8.4", "package": "tigervnc-0:1.11.0-8.el8_4.12", "product_name": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support", "release_date": "2025-03-17T00:00:00Z"}, {"advisory": "RHSA-2025:2865", "cpe": "cpe:/a:redhat:rhel_tus:8.4", "package": "tigervnc-0:1.11.0-8.el8_4.12", "product_name": "Red Hat Enterprise Linux 8.4 Telecommunications Update Service", "release_date": "2025-03-17T00:00:00Z"}, {"advisory": "RHSA-2025:2865", "cpe": "cpe:/a:redhat:rhel_e4s:8.4", "package": "tigervnc-0:1.11.0-8.el8_4.12", "product_name": "Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions", "release_date": "2025-03-17T00:00:00Z"}, {"advisory": "RHSA-2025:2880", "cpe": "cpe:/a:redhat:rhel_aus:8.6", "package": "tigervnc-0:1.12.0-6.el8_6.13", "product_name": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support", "release_date": "2025-03-17T00:00:00Z"}, {"advisory": "RHSA-2025:2880", "cpe": "cpe:/a:redhat:rhel_tus:8.6", "package": "tigervnc-0:1.12.0-6.el8_6.13", "product_name": "Red Hat Enterprise Linux 8.6 Telecommunications Update Service", "release_date": "2025-03-17T00:00:00Z"}, {"advisory": "RHSA-2025:2880", "cpe": "cpe:/a:redhat:rhel_e4s:8.6", "package": "tigervnc-0:1.12.0-6.el8_6.13", "product_name": "Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions", "release_date": "2025-03-17T00:00:00Z"}, {"advisory": "RHSA-2025:2862", "cpe": "cpe:/a:redhat:rhel_eus:8.8", "package": "tigervnc-0:1.12.0-15.el8_8.12", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2025-03-17T00:00:00Z"}, {"advisory": "RHSA-2025:2500", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "tigervnc-0:1.14.1-1.el9_5.1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-03-10T00:00:00Z"}, {"advisory": "RHSA-2025:7163", "cpe": "cpe:/a:redhat:enterprise_linux:9", "impact": "moderate", "package": "xorg-x11-server-0:1.20.11-28.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:7165", "cpe": "cpe:/a:redhat:enterprise_linux:9", "impact": "moderate", "package": "xorg-x11-server-Xwayland-0:23.2.7-3.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:2873", "cpe": "cpe:/a:redhat:rhel_e4s:9.0", "package": "tigervnc-0:1.11.0-22.el9_0.13", "product_name": "Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions", "release_date": "2025-03-17T00:00:00Z"}, {"advisory": "RHSA-2025:2874", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "tigervnc-0:1.12.0-14.el9_2.10", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2025-03-17T00:00:00Z"}, {"advisory": "RHSA-2025:2875", "cpe": "cpe:/a:redhat:rhel_eus:9.4", "package": "tigervnc-0:1.13.1-8.el9_4.5", "product_name": "Red Hat Enterprise Linux 9.4 Extended Update Support", "release_date": "2025-03-17T00:00:00Z"}], "bugzilla": {"description": "Xorg: xwayland: Buffer overflow in XkbVModMaskText()", "id": "2345257", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2345257"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-121", "details": ["A buffer overflow flaw was found in X.Org and Xwayland. The code in XkbVModMaskText() allocates a fixed-sized buffer on the stack and copies the names of the virtual modifiers to that buffer. The code fails to check the bounds of the buffer and would copy the data regardless of the size.", "A buffer overflow flaw was found in X.Org and Xwayland. The code in XkbVModMaskText() allocates a fixed-sized buffer on the stack and copies the names of the virtual modifiers to that buffer. The code fails to check the bounds of the buffer and would copy the data regardless of the size."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2025-26595", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "tigervnc", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "xorg-x11-server", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "impact": "moderate", "package_name": "xorg-x11-server", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "impact": "moderate", "package_name": "xorg-x11-server-Xwayland", "product_name": "Red Hat Enterprise Linux 8"}], "public_date": "2025-02-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-26595\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-26595"], "statement": "Xorg server does not run with root privileges in Red Hat Enterprise Linux 8 and 9, therefore, Red Hat Enterprise Linux 8 and 9 have been rated with a Moderate severity and are not affected by this bug.", "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-28T03:38:11.539092+00:00", "value": {"mitigation_remediation": ["Apply the Red\u00a0Hat security errata updates (RHSA\u20112025:2500, RHSA\u20112025:2502, RHSA\u20112025:2861, etc.) that fix the XkbVModMaskText overflow.", "Reboot the system after the updates to ensure the new X.org and XWayland binaries are in use.", "Limit X server access to local connections or configure the firewall to block remote X client connections until the patch is in effect."], "summary": {"action": "Immediate Patch", "impact": "Remote code execution"}, "threat_synthesis": {"affected_systems": "The flaw affects Red\u00a0Hat Enterprise Linux 6, 7, 8, 9, and 10 in their standard and extended update streams, as well as the underlying X.Org Server and XWayland packages delivered with those distributions. All listed RHEL releases that include the vulnerable XKB code are impacted.", "description_and_impact": "A stack\u2011based buffer overflow exists in the XKB library function XkbVModMaskText, which copies virtual modifier names into a fixed\u2011size stack buffer without validating the input length. The flaw allows an attacker to overflow the buffer, corrupt memory, and potentially execute arbitrary code or crash the X server. The vulnerability is classified under CWE\u2011121 (Stack Based Buffer Overflow) and CWE\u2011787 (Out\u2011of\u2011Bounds Write).", "risk_and_exploitability": "The assessed CVSS score of 7.8 reflects a high\u2011severity issue. The EPSS score of less than 1\u202f% indicates a low probability of exploitation in observed CVE usage, and the vulnerability is not currently listed in the CISA KEV catalog. Based on the description, the exploitation likely requires local interaction with a running X server or remote X client connections; however, concrete attack paths are not detailed in the advisory. Administrators should assume the potential for remote code execution if the X server is exposed to untrusted networks, and the risk remains high until the security updates are applied."}}}}, "created": "2026-04-28T03:45:20.281125+00:00", "updated": "2026-04-28T03:45:20.281135+00:00", "vendors": []}