CVE•Published 2026-06-17•Modified 2026-09-17•1 article on news•5 live references•NVD data
CVE-2026-55200Libssh2 · Libssh2
Vulnerability data via NVD (ingested)
CVSS v3.1
8.1
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
90
Exploit Prediction Scoring System · top 10% of all CVEs
Weaknesses (CWE)
Description
libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt heap memory and achieve remote code execution.
Timeline
Published 2026-06-17
Modified 2026-09-17
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-55200Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product + version
product:"Libssh2 Libssh2" version:"1.11.1"Version-pinned fingerprint from NVD's first vulnerable CPE.
Shodan · banner/body mention
http.html:"Libssh2"HTTP body or banner mentions "Libssh2" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-55200Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-55200Censys host search filtered to this CVE id.
grep.app
CVE-2026-55200Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-55200GitHub code search for direct mentions.
Google dork
"CVE-2026-55200" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub (8)
CVE-2026-552008 repos
bikini/exploitariumPython
A single archive of public exploit PoCs and vulnerability research writeups. At the time I post these, none have been reported. Feel free to report them yourself and take credit fo…
allen-110/exploitariumPython
Ethan-Andrews/Exploitarium-Detectionsunknown
KQL detection rules for Microsoft Sentinel and Defender XDR covering the bikini/exploitarium anonymous disclosure — a personal research archive of 15+ distinct vulnerability target…
0xnhsec/0-day-PoC-RepoPython
Understood
MaikCyberSec/Threat-Hunting-unknown
Threat Hunting based on KQL
0xBlackash/CVE-2026-55200C
CVE-2026-55200
patricio0312rev/anysshSwift
Open-source SSH client for iPhone and iPad: terminal, remote git and files, tmux and herdr. No backend, no telemetry.
xd20111/CVE-2026-55200C
CVE-2026-55200 - Critical libssh2 Remote Code Execution Vulnerability