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    CVE-2026-32854

    LibVNCServer versions 0.9.15 and prior (fixed in commit dc78dee) contain null pointer dereference vulnerabilities in the HTTP proxy handlers within httpProcessInput() in httpd.c that allow remote attackers to cause a denial of service by sending specially crafted HTTP requests. Attackers can exploit missing validation of strchr() return values in the CONNECT and GET proxy handling paths to trigger null pointer dereferences and crash the server when httpd and proxy features are enabled.

    Published:Mar 24, 2026
    Last Modified:Jul 14, 2026
    EPS:Mar 24, 2026
    EPSS Score:0.05322
    CVSS Score:7.5

    Affected Products

    Vendor
    Libvnc Project
    Product
    Libvncserver
    Vendor
    Libvncserver
    Product
    Libvncserver
    Vendor
    Libvncserver Project
    Product
    Libvncserver

    Exploits

    https://github.com/LibVNC/libvncserver/security/advisories/GHSA-xjp8-4qqv-5x4x

    Common Weakness Enumeration

    CWE-476 NULL Pointer Dereference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-32853 (CVSS 6.9) — LibVNCServer versions 0.9.15 and prior (fixed in commit 009008e) contain a heap out-of-bounds read vulnerabili…
    CVE-2018-21247 (CVSS 7.5) — An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory c…
    CVE-2020-14404 (CVSS 5.4) — An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rre.c allows out-of-bounds access via enco…
    CVE-2020-14398 (CVSS 7.5) — An issue was discovered in LibVNCServer before 0.9.13. An improperly closed TCP connection causes an infinite …
    CVE-2020-14402 (CVSS 5.4) — An issue was discovered in LibVNCServer before 0.9.13. libvncserver/corre.c allows out-of-bounds access via en…
    CVE-2020-14397 (CVSS 7.5) — An issue was discovered in LibVNCServer before 0.9.13. libvncserver/rfbregion.c has a NULL pointer dereference…
    CVE-2020-14396 (CVSS 7.5) — An issue was discovered in LibVNCServer before 0.9.13. libvncclient/tls_openssl.c has a NULL pointer dereferen…
    CVE-2020-14403 (CVSS 5.4) — An issue was discovered in LibVNCServer before 0.9.13. libvncserver/hextile.c allows out-of-bounds access via …
    CVE-2019-20840 (CVSS 7.5) — An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of…
    CVE-2019-20839 (CVSS 7.5) — libvncclient/sockets.c in LibVNCServer before 0.9.13 has a buffer overflow via a long socket filename.…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High