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libexpat EUVDEUVD-2026-38184

| CVE-2026-56407 MEDIUM
Integer Overflow or Wraparound (CWE-190)
2026-06-21 mitre GHSA-r8qx-5vfx-8w6r
Integer Overflow Buffer Overflow Libexpat Suse
6.9
CVSS 3.1 · Vendor: mitre
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Severity by source

Vendor (mitre) PRIMARY
6.9 MEDIUM
AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
vuln.today AI
7.7 HIGH

libexpat commonly parses externally sourced XML justifying AV:N; heap corruption from integer overflow requires precise memory control, warranting AC:H.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative

Primary rating from Vendor (mitre).

CVSS VectorVendor: mitre

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
Attack Vector
Local
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low

Lifecycle Timeline

3
Source Code Evidence Fetched
Jun 22, 2026 - 06:42 vuln.today
Analysis Generated
Jun 22, 2026 - 06:42 vuln.today
Patch available
Jun 21, 2026 - 17:01 EUVD

DescriptionCVE.org

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

AnalysisAI

Integer overflow in libexpat before 2.8.2 allows heap corruption during XML prolog parsing when accumulated entity value pool length exceeds INT_MAX, yielding high confidentiality and integrity impact per CVSS. The flaw resides in doProlog and the related storeSelfEntityValue path, where poolLength() return values are cast to signed integers without bounds validation - a gap closed in the upstream fix via explicit INT_MAX guards. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft XML with entity values totaling >INT_MAX bytes
Delivery
Submit XML to libexpat-parsing application
Exploit
doProlog pool length overflows signed integer
Execution
Heap pool metadata corrupted
Impact
Leverage corrupted heap for arbitrary read/write
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Vulnerability AssessmentAI

Exploitation The vulnerability is reachable whenever libexpat before 2.8.2 processes an XML document containing entity declarations in the prolog - this is standard XML and requires no non-default parser configuration. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The provided CVSS vector CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L (score 6.9) characterizes this as a local, high-complexity attack with no authentication requirement. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker submits a crafted XML document to any service or application that uses libexpat < 2.8.2 to parse externally supplied XML - such as a REST API accepting XML payloads, a file upload endpoint, or a network protocol parser. The document contains entity declarations with aggregate value content exceeding INT_MAX bytes, driving the doProlog entity value pool length past the signed integer boundary and corrupting adjacent heap metadata. …
Remediation The primary remediation is upgrading libexpat to version 2.8.2 or later, where the integer overflow guards introduced in GitHub PR #1262 (https://github.com/libexpat/libexpat/pull/1262) eliminate the vulnerable code paths in both doProlog and storeSelfEntityValue. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-190 – Integer Overflow or Wraparound

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7.5
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CVE-2013-3940 CRITICAL
9.3

Same technique Integer Overflow

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CVE-2014-0497 CRITICAL POC
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CVE-2015-8651 HIGH
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CVE-2012-5054 HIGH POC
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CVE-2014-0569 CRITICAL POC
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8.8

Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SLES15-SP5-CHOST-BYOS-SAP-CCloud Not-Affected
SLES15-SP5-CHOST-BYOS-SAP-CCloud Affected
SLES15-SP6-CHOST-BYOS Affected
SLES15-SP6-CHOST-BYOS-Aliyun Affected
SLES15-SP6-CHOST-BYOS-Azure Affected

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EUVD-2026-38184 vulnerability details – vuln.today
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