CVE-2026-56407

🔶 medium

🔍 Scan for this CVE

libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textLen.

CVSS Score

6.9

Medium

EPSS Score

0.1

Exploit Probability

Published Date

2026-06-21

First Seen: 2026-06-25

This CVE is Moderate Risk - more severe than 51.0% of all 329,456 vulnerabilities in our database.

#161,290

Above average severity

Severity Percentile

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Total

Complete system compromise possible

SSVC data provided by CISA

Last Modified 2026-06-23

Source NVD 🔗

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

CWE IDs (Weakness Types)

CWE-190

📦 Affected Products 1

Vendor	Product	Status	Affected Versions
libexpat_project	libexpat	Affected	< 2.8.2

Patch Issue Tracking

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-56403	🔶 medium	6.9	0.1	libexpat before 2.8.2 has an integer overflow in storeAtts.	2026-06-21
CVE-2026-56404	🔶 medium	6.9	0.1	libexpat before 2.8.2 has an integer overflow in addBinding.	2026-06-21
CVE-2026-56405	🔶 medium	6.9	0.1	libexpat before 2.8.2 has an integer overflow in getAttributeId.	2026-06-21
CVE-2026-56406	🔶 medium	6.9	0.1	libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse...	2026-06-21
CVE-2026-56408	🔶 medium	6.9	0.1	libexpat before 2.8.2 has an integer overflow in copyString.	2026-06-21
CVE-2026-56409	🔶 medium	6.5	0.1	xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.	2026-06-21

These CVEs affect the same products