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Servers and applications

CVE-2016-5300

The XML parser in Expat does not use sufficient entropy for hash initialization, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted identifiers in an XML document. NOTE: this vulnerability exists because of an incomplete fix for CVE-2012-0876.

Severity
High 7.5
Published
16 Jun 2016
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
2.2.0
Exploit chance
6.5% in the next 30 daysHigher than 93% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
CWE-399
Attack
Over the network · No login needed · No user action needed
Attacker can
Take it down
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Sources
NVD

Affected software

SoftwareAffected versions
ExpatServers and applications · cpe:a:libexpat_project:libexpat
  • Every version before 2.2.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2016-5300
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-5300