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Description

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 Reserved 2026-03-16 | Published 2026-03-24 | Updated 2026-03-27 | Assigner VulnCheck




MEDIUM: 6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Problem types

CWE-476 NULL pointer dereference

Product status

Default status
unaffected

Any version
affected

dc78dee51a7e270e537a541a17befdf2073f5314 (git)
unaffected

Credits

Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc. finder

References

github.com/...server/security/advisories/GHSA-xjp8-4qqv-5x4x vendor-advisory

github.com/...ommit/dc78dee51a7e270e537a541a17befdf2073f5314 patch

www.vulncheck.com/...er-httpd-proxy-null-pointer-dereference third-party-advisory

cve.org (CVE-2026-32854)

nvd.nist.gov (CVE-2026-32854)

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