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CVE-2026-7840: Out-of-bounds Write

🗓️ 01 Jul 2026 00:00:00Reported by Rapid7Type 
rapid7
 rapid7
🔗 www.rapid7.com

UltraVNC repeater through 1.8.2.2 contains a global buffer overflow in its embedded HTTP administration server. The functions wi_senderr() and wi_replyhdr() in repeater/webgui/webutils.c write the caller-supplied HTTP request URI into a fixed 1000...

Related
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-7840
1 Jul 202603:33
–attackerkb
circl
Circl
CVE-2026-7840
3 Jul 202602:25
–circl
cve
CVE
CVE-2026-7840
1 Jul 202603:33
–cve
cvelist
Cvelist
CVE-2026-7840 UltraVNC repeater HTTP server global buffer overflow via long URI (pre-auth RCE)
1 Jul 202603:33
–cvelist
euvd
EUVD
EUVD-2026-40886
1 Jul 202603:33
–euvd
nvd
NVD
CVE-2026-7840
1 Jul 202605:16
–nvd
ptsecurity
Positive Technologies
PT-2026-54490
1 Jul 202600:00
–ptsecurity
vulnrichment
Vulnrichment
CVE-2026-7840 UltraVNC repeater HTTP server global buffer overflow via long URI (pre-auth RCE)
1 Jul 202603:33
–vulnrichment

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09 Jul 2026 00:00Current
CVSS 49.3
CVSS 3.19.8
EPSS0.02628
SSVC
0