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Libexpat EUVDEUVD-2026-12349

| CVE-2026-32777 MEDIUM
Loop with Unreachable Exit Condition (Infinite Loop) (CWE-835)
2026-03-16 mitre
Denial Of Service Libexpat
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SUSE
MEDIUM
qualitative
Red Hat
4.0 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

5
CVSS changed
Jul 14, 2026 - 13:22 NVD
4.0 (MEDIUM) 5.5 (MEDIUM)
Patch available
Apr 16, 2026 - 05:29 EUVD
2.7.5
EUVD ID Assigned
Mar 16, 2026 - 09:00 euvd
EUVD-2026-12349
Analysis Generated
Mar 16, 2026 - 09:00 vuln.today
CVE Published
Mar 16, 2026 - 06:58 nvd
MEDIUM 4.0

DescriptionNVD

libexpat before 2.7.5 allows an infinite loop while parsing DTD content.

AnalysisAI

libexpat before version 2.7.5 contains an infinite loop vulnerability triggered during DTD (Document Type Definition) parsing, allowing local attackers to cause a denial of service condition. The vulnerability affects all applications and libraries that depend on libexpat for XML parsing, with a CVSS score of 4.0 reflecting limited severity due to local-only attack vector and availability impact. While the CVSS base score is moderate, the infinite loop condition presents a real denial of service risk for services that parse untrusted XML documents containing malicious DTD content.

Technical ContextAI

libexpat is a widely-used C library for parsing XML documents (CPE: cpe:2.3:a:libexpat:libexpat). The vulnerability exists in the DTD parsing logic, which processes Document Type Definition declarations that can include entity definitions, attribute declarations, and notation declarations. The root cause is classified under CWE-835 (Infinite Loop), indicating that the parser enters an unbounded loop condition when processing certain DTD constructs rather than properly terminating parsing or raising an error. This is a classic resource exhaustion vulnerability where malformed or specifically crafted DTD content causes the parser to consume CPU resources indefinitely, preventing normal operation of any application using the affected libexpat version for XML parsing operations.

RemediationAI

Upgrade libexpat to version 2.7.5 or later immediately. On Linux systems, use your distribution's package manager (apt, yum, dnf, etc.) to update libexpat and any dependent packages. For applications that embed libexpat, update to the latest version of that application which includes the patched libexpat library. Until patching is completed, restrict local access to systems parsing untrusted XML content and consider implementing input validation or XML parsing timeouts at the application level to detect and interrupt infinite loops. If your organization cannot patch immediately, disable XML DTD processing where possible via application configuration settings, as many XML parsers offer options to restrict DTD parsing to reduce attack surface.

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Denial of service in libexpat before 2.8.1 lets remote attackers exhaust CPU by submitting moderately sized crafted XML

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In libexpat through 2.4.9, there is a use-after free caused by overeager destruction of a shared DTD in XML_ExternalEnti
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In libexpat before 2.2.8, crafted XML input could fool the parser into changing from DTD parsing to document parsing too
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expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XML_SetE
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Same weakness CWE-835 – Loop with Unreachable Exit Condition (Infinite Loop)

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8.6
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7.5
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9.1
CVE-2026-25533 HIGH POC
8.8
CVE-2018-8002 HIGH POC
8.8
CVE-2017-15223 MEDIUM POC
5.3
CVE-2025-71329 HIGH POC
8.7

Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
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8.8
CVE-2012-1889 HIGH POC
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CVE-2012-0507 CRITICAL POC
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CVE-2014-1761 HIGH POC
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CVE-2011-0609 HIGH POC
7.8

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Container suse/ltss/sle12.5/sles12sp5:8.5.217 Affected
Container suse/manager/4.3/proxy-httpd:latest Container suse/manager/4.3/proxy-salt-broker:4.3.17.9.66.5 Container suse/manager/4.3/proxy-ssh:latest Container suse/manager/4.3/proxy-tftpd:4.3.17.9.66.5 Container suse/sle-micro/base-5.5:latest Container suse/sle-micro/kvm-5.5:latest Image SLES15-SP5-Micro-5-5 Image SLES15-SP5-Micro-5-5-Azure Affected
Container suse/sl-micro/6.0/baremetal-os-container:2.1.3-6.156 Container suse/sl-micro/6.0/base-os-container:2.1.3-7.123 Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.140 Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.154 Container suse/sl-micro/6.0/toolbox:13.2-9.91 Container suse/sl-micro/6.1/baremetal-os-container:2.2.1-7.86 Container suse/sl-micro/6.1/base-os-container:2.2.1-5.110 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.112 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.100 Image SL-Micro Affected
Container suse/sle-micro-rancher/5.2:latest Container suse/sle-micro/5.2/toolbox:14.2-7.11.264 Affected
Container suse/sles/16.0/toolbox:16.3-1.42 Affected

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EUVD-2026-12349 vulnerability details – vuln.today
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