The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:24341 advisory.

    Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop     environment not only on the machine where it is running, but from anywhere on the Internet and from a wide     variety of machine architectures. TigerVNC is a suite of VNC servers and clients.

    Security Fix(es):

    * xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map     handling (CVE-2026-33999)

    * xwayland: xorg: X.Org X server: Information disclosure and denial of service via out-of-bounds read in     XKB geometry processing. (CVE-2026-34000)

    * xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory     corruption (CVE-2026-34001)

    * xorg: xwayland: X.Org X server: Information disclosure or Denial of Service via out-of-bounds read in     XKB modifier map handling (CVE-2026-34002)

    * xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory     access (CVE-2026-34003)

    * TigerVNC: x0vncserver: TigerVNC x0vncserver: Information disclosure, data manipulation, and denial of     service via incorrect permissions (CVE-2026-34352)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the tigervnc packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    In TigerVNC before 1.16.2, Image.cxx in x0vncserver allows other users to observe or manipulate the screen     contents, or cause an application crash, because of incorrect permissions.(CVE-2026-34352)

Tenable has extracted the preceding description block directly from the EulerOS tigervnc security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-19342 advisory.

    - Fix CVE-2026-33999, CVE-2026-34000, CVE-2026-34001, CVE-2026-34002,       CVE-2026-34003 xorg-x11-server: various XKB and XSYNC vulnerabilities       Resolves: RHEL-163213       Resolves: RHEL-163281       Resolves: RHEL-163267
    - Fix CVE-2026-34352       Resolves: RHEL-167986
    - Fix CVE-2025-62229: xorg-x11-server: Use-after-free in XPresentNotify structures creation       Resolves: RHEL-119989
    - Fix CVE-2025-62230: xorg-x11-server: Use-after-free in Xkb client resource removal       Resolves: RHEL-120009

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Tencent Linux installed on the remote TencentOS Server 2 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2026:0591 advisory.

    Package updates are available for TencentOS Server 2 that fix the following vulnerabilities:

    CVE-2026-33999:
    A flaw was found in the X.Org X server. This integer underflow vulnerability, specifically in the XKB     compatibility map handling, allows an attacker with local or remote X11 server access to trigger a buffer     read overrun. This can lead to memory-safety violations and potentially a denial of service (DoS) or other     severe impacts.

    CVE-2026-34000:
    A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry     processing, specifically within the CheckSetGeom() and XkbAddGeomKeyAlias functions, allows an attacker to     read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either     locally or remotely, can exploit this without user interaction. This could lead to the disclosure of     memory contents or cause a denial of service by crashing the server.

    CVE-2026-34001:
    A flaw was found in the X.Org X server. This use-after-free vulnerability occurs in the XSYNC fence     triggering logic, specifically within the miSyncTriggerFence() function. An attacker with access to the     X11 server can exploit this without user interaction, leading to a server crash and potentially enabling     memory corruption. This could result in a denial of service or further compromise of the system.

    CVE-2026-34002:
    A flaw was found in the X.Org X server. This vulnerability, an out-of-bounds read, affects the XKB (X     Keyboard Extension) modifier map handling. An attacker with access to the X11 server can exploit this by     sending a malformed request, which causes the server to read beyond its intended memory boundaries. This     can lead to the exposure of sensitive information or cause the server to crash, resulting in a denial of     service.

    CVE-2026-34003:
    A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a     specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This     could result in the disclosure of sensitive information or cause the server to crash, leading to a Denial     of Service (DoS). In certain configurations, higher impact outcomes may be possible.

    CVE-2026-34352:
    In TigerVNC before 1.16.2, Image.cxx in x0vncserver allows other users to observe or manipulate the screen     contents, or cause an application crash, because of incorrect permissions.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The CentOS Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS7:CLSA-2026:1779798274 advisory.

  - A use-after-free flaw was found in X.Org and Xwayland. The root cursor is referenced in the X server as a     global variable. If a client frees the root cursor, the internal reference points to freed memory and     causes a use-after-free. (CVE-2025-26594)

  - 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. (CVE-2025-26595)

  - 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.
    (CVE-2025-26596)

  - A buffer overflow flaw was found in X.Org and Xwayland. If XkbChangeTypesOfKey() is called with a 0 group,     it will resize the key symbols table to 0 but leave the key actions unchanged. If the same function is     later called with a non-zero value of groups, this will cause a buffer overflow because the key actions     are of the wrong size. (CVE-2025-26597)

  - An out-of-bounds write flaw was found in X.Org and Xwayland. The function GetBarrierDevice() searches for     the pointer device based on its device ID and returns the matching value, or supposedly NULL, if no match     was found. However, the code will return the last element of the list if no matching device ID is found,     which can lead to out-of-bounds memory access. (CVE-2025-26598)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Rocky Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_13414 advisory.

    * xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map     handling (CVE-2026-33999)

    * xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory     corruption (CVE-2026-34001)

    * xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory     access (CVE-2026-34003)

    * TigerVNC: x0vncserver: TigerVNC x0vncserver: Information disclosure, data manipulation, and denial of     service via incorrect permissions (CVE-2026-34352)

Tenable has extracted the preceding description block directly from the CIQ security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Rocky Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_19342 advisory.

    * xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map     handling (CVE-2026-33999)

    * xwayland: xorg: X.Org X server: Information disclosure and denial of service via out-of-bounds read in     XKB geometry processing. (CVE-2026-34000)

    * xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory     corruption (CVE-2026-34001)

    * xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory     access (CVE-2026-34003)

    * TigerVNC: x0vncserver: TigerVNC x0vncserver: Information disclosure, data manipulation, and denial of     service via incorrect permissions (CVE-2026-34352)

Tenable has extracted the preceding description block directly from the CIQ security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2026-10739 advisory.

    - Fix CVE-2026-33999, CVE-2026-34000, CVE-2026-34001, CVE-2026-34002,       CVE-2026-34003 xorg-x11-server: various XKB and XSYNC vulnerabilities       Resolves: RHEL-163212       Resolves: RHEL-163280       Resolves: RHEL-163266

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:22456 advisory.

    Virtual Network Computing (VNC) is a remote display system which allows users to view a computing desktop     environment not only on the machine where it is running, but from anywhere on the Internet and from a wide     variety of machine architectures. TigerVNC is a suite of VNC servers and clients.

    Security Fix(es):

    * xorg: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility map     handling (CVE-2026-33999)

    * xwayland: xorg: X.Org X server: Information disclosure and denial of service via out-of-bounds read in     XKB geometry processing. (CVE-2026-34000)

    * xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and potential memory     corruption (CVE-2026-34001)

    * xorg: xwayland: X.Org X server: Information disclosure or Denial of Service via out-of-bounds read in     XKB modifier map handling (CVE-2026-34002)

    * xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds memory     access (CVE-2026-34003)

    * TigerVNC: x0vncserver: TigerVNC x0vncserver: Information disclosure, data manipulation, and denial of     service via incorrect permissions (CVE-2026-34352)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
319650	RHEL 8 : tigervnc (RHSA-2026:24341)	Nessus	Red Hat Local Security Checks	2026/6/8	2026/6/8	critical
319985	EulerOS 2.0 SP11 : tigervnc (EulerOS-SA-2026-2230)	Nessus	Huawei Local Security Checks	2026/6/9	2026/6/9	critical
320239	EulerOS 2.0 SP13 : tigervnc (EulerOS-SA-2026-2316)	Nessus	Huawei Local Security Checks	2026/6/10	2026/6/10	critical
322345	Oracle Linux 9 : tigervnc (ELSA-2026-19342)	Nessus	Oracle Linux Local Security Checks	2026/6/24	2026/6/24	critical
324631	TencentOS Server 2: tigervnc (TSSA-2026:0591)	Nessus	Tencent Local Security Checks	2026/7/2	2026/7/2	critical
326574	EulerOS 2.0 SP10 : tigervnc (EulerOS-SA-2026-2674)	Nessus	Huawei Local Security Checks	2026/7/14	2026/7/14	critical
326170	EulerOS 2.0 SP12 : tigervnc (EulerOS-SA-2026-2633)	Nessus	Huawei Local Security Checks	2026/7/10	2026/7/10	critical
359757	CentOS Linux 7 [TuxCare] Security Update: tigervnc / tigervnc-icons / tigervnc-license / tigervnc-server / etc Multiple Vulnerabilities (CENTOS7:CLSA-2026:1779798274)	Nessus	CentOS Local Security Checks	2026/10/1	2026/10/1	critical
355694	Rocky Linux 8 [CIQ] Security Update: tigervnc / tigervnc-debuginfo / tigervnc-debugsource / etc Multiple Vulnerabilities (crlsa-2026_13414)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/1	critical
353775	Rocky Linux 9 [CIQ] Security Update: tigervnc / tigervnc-debuginfo / tigervnc-debugsource / etc Multiple Vulnerabilities (crlsa-2026_19342)	Nessus	Rocky Linux Local Security Checks	2026/10/1	2026/10/1	critical
310546	Oracle Linux 9 : tigervnc (ELSA-2026-10739)	Nessus	Oracle Linux Local Security Checks	2026/4/27	2026/4/27	critical
319560	RHEL 7 : tigervnc (RHSA-2026:22456)	Nessus	Red Hat Local Security Checks	2026/6/6	2026/6/6	critical
323151	EulerOS 2.0 SP15 : tigervnc (EulerOS-SA-2026-2511)	Nessus	Huawei Local Security Checks	2026/6/27	2026/6/27	critical
326191	EulerOS 2.0 SP12 : tigervnc (EulerOS-SA-2026-2573)	Nessus	Huawei Local Security Checks	2026/7/10	2026/7/10	critical
319991	EulerOS 2.0 SP11 : tigervnc (EulerOS-SA-2026-2267)	Nessus	Huawei Local Security Checks	2026/6/9	2026/6/9	critical

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