CVE-2026-86139
Received Received - Intake

Integer Overflow in libxml2 URI Handling

Publication date: 2026-09-05

Last updated on: 2026-09-05

Assigner: MITRE

Description
In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.

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Meta Information

Published
2026-09-05
Last Modified
2026-09-05
Generated
2026-09-05
AI Q&A
2026-09-05
EPSS Evaluated
N/A
NVD
CVE-2026-86139
EUVD
EUVD-2026-71832

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
gnome libxml2 to 2.15.4 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-190 The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

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Executive Summary

This vulnerability is an integer overflow in the libxml2 library before version 2.15.4. It occurs in the xmlURIEscapeStr function in uri.c when xmlStrlen() returns 0 for strings longer than INT_MAX. This leads to incorrect length calculation and causes the write loop to overflow due to integer wrapping of the output counter.

Impact Analysis

An attacker could exploit this to cause a denial of service or potentially execute arbitrary code by triggering the integer overflow. This may lead to crashes or unexpected behavior in applications using vulnerable versions of libxml2.

Mitigation Strategies

Update libxml2 to version 2.15.4 or later to address the integer overflow in xmlURIEscapeStr. Check your package manager for updates or compile from source using the patched version.

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