CVE•Published 2024-08-30•Modified 2026-05-12•1 article on news•6 live references•NVD data

CVE-2024-45491Libexpat_project · Libexpat

Vulnerability data via NVD (ingested)

CVSS v3.1

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS percentile

Exploit Prediction Scoring System · top 31% of all CVEs

Weaknesses (CWE)

CWE-190Integer Overflow or Wraparound

Description

An issue was discovered in libexpat before 2.6.3. dtdCopy in xmlparse.c can have an integer overflow for nDefaultAtts on 32-bit platforms (where UINT_MAX equals SIZE_MAX).

Timeline

Published 2024-08-30

Modified 2026-05-12

External references

NVD MITRE Exploit-DB GitHub PoC trickest/cve VulnCheck

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-2024-45491

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Libexpat Project Libexpat"

All exposed Libexpat Project Libexpat instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Libexpat"

HTTP body or banner mentions "Libexpat" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2024-45491