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CVE-2026-56132

Published: Jun 19, 2026Updated: Jun 22, 2026 Sources: CVE List NVDCWE-821
NVD MITRE
6.9CVSSMEDIUM
EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

Description

In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.

CVSS Vector Breakdown

AV:LAC:HPR:NUI:NS:UC:HI:HA:L
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:LAvailability
Low
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Weaknesses

CWE-821

Affected Products

libexpatlibexpat project
LibraryLibrary
OSS Libraries / generic-library
libexpat projectoss-projectOSS Librariesaka expat, libexpat

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/libexpat/libexpat/pull/1272
github.com

Timeline

Published
Jun 19, 2026
Last Updated
Jun 22, 2026

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