CVE-2025-26596

A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms() differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer overflow.

CVSS v3 7.8 HIGH

7.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2025:2500	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2502	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2861	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2862	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2865	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2866	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2873	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2874	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2875	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2879	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2880	Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:3976
https://access.redhat.com/errata/RHSA-2025:7163
https://access.redhat.com/errata/RHSA-2025:7165
https://access.redhat.com/errata/RHSA-2025:7458
https://access.redhat.com/security/cve/CVE-2025-26596	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2345256	Issue Tracking
https://lists.debian.org/debian-lts-announce/2025/02/msg00036.html

Configurations

Configuration 1 (hide)

cpe:2.3:a:tigervnc:tigervnc:-:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:a:x.org:x_server::::::::
	cpe:2.3:a:x.org:xwayland::::::::

Configuration 3 (hide)

OR	cpe:2.3:o:redhat:enterprise_linux:7.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*
	cpe:2.3:o:redhat:enterprise_linux:9.0:::::::*

History

No history.

Information

Published : 2025-02-25 16:15

Updated : 2026-06-29 21:16

NVD link : CVE-2025-26596

Mitre link : CVE-2025-26596

CVE.ORG link : CVE-2025-26596

JSON object : View

Products Affected

x.org

x_server
xwayland

tigervnc

tigervnc

redhat

enterprise_linux

CWE

CWE-787

Out-of-bounds Write

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"tags": ["Third Party Advisory"], "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"}, {"url": "https://access.redhat.com/security/cve/CVE-2025-26596", "tags": ["Third Party Advisory"], "source": "secalert@redhat.com"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2345256", "tags": ["Issue Tracking"], "source": "secalert@redhat.com"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/02/msg00036.html", "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "secalert@redhat.com", "description": [{"lang": "en", "value": "CWE-787"}]}, {"type": "Secondary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms() differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer overflow."}, {"lang": "es", "value": "Se encontr\u00f3 una falla de desbordamiento de b\u00fafer en X.Org y Xwayland. El c\u00e1lculo de la longitud en XkbSizeKeySyms() difiere de lo que est\u00e1 escrito en XkbWriteKeySyms(), lo que puede provocar un desbordamiento de b\u00fafer en el b\u00fafer."}], "lastModified": "2026-06-29T21:16:33.690", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:tigervnc:tigervnc:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "79A8316C-BA22-441E-92AF-415AFABCEB76"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "07E5F462-A20F-472C-85E7-804D46F01A7A", "versionEndExcluding": "21.1.16"}, {"criteria": "cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "1CBC57E6-F54D-4B54-9263-9753CCA3EEF7", "versionEndExcluding": "24.1.6"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "142AD0DD-4CF3-4D74-9442-459CE3347E3A"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F4CFF558-3C47-480D-A2F0-BABF26042943"}, {"criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7F6FB57C-2BC7-487C-96DD-132683AEB35D"}], "operator": "OR"}]}], "sourceIdentifier": "secalert@redhat.com"}