CVE•Published 2026-07-08•Modified 2026-07-09•1 article on news•6 live references•NVD data
CVE-2026-56003X · Libxfont
Vulnerability data via NVD (ingested)
CVSS v3.1
8.5
HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
EPSS percentile
44
Exploit Prediction Scoring System · top 56% of all CVEs
Weaknesses (CWE)
Description
A heap buffer overflow due to missing size checking in the property buffer when parsing PCF files in libXfont2 ComputeScaledProperties() before libXfont2 before 2.0.8 could be used by attackers using authenticated X clients to execute code within the X server.
Timeline
Published 2026-07-08
Modified 2026-07-09
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-2026-56003Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"X Libxfont"All exposed X Libxfont instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Libxfont"HTTP body or banner mentions "Libxfont" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-56003Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-56003Censys host search filtered to this CVE id.
grep.app
CVE-2026-56003Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-56003GitHub code search for direct mentions.
Google dork
"CVE-2026-56003" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-56003 on GitHub.