CVE-2026-86139
published 2026-09-05CVE-2026-86139: In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.
PriorityP339high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.17%
5.5th percentile
In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| ubuntu | libxml2 | — | — |
| xmlsoft | libxml2 | < 2.15.4 | 2.15.4 |
| xmlsoft | libxml2 | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_redhat6.9MEDIUM
vendor_ubuntu5.5MEDIUM
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Ubuntu
libxml2 vulnerabilities
vendor_ubuntu·2026-10-08·CVSS 5.5
CVE-2026-86144 [MEDIUM] libxml2 vulnerabilities
Title: libxml2 vulnerabilities
Summary: Several security issues were fixed in libxml2.
Yirou Yang discovered that libxml2 incorrectly handled certain XML
catalogs. If a user or automated system was tricked into processing a
specially crafted XML catalog, an attacker could possibly use this issue to
cause libxml2 to crash, resulting in a denial of service. (CVE-2026-76781)
It was discovered that libxml2 incorrectly handled certain large qualified
names, leading to a heap-based buffer overflow. An attacker could possibly
use this issue to cause libxml2 to crash, resulting in a denial of service,
or possibly execute arbitrary code. (CVE-2026-86138)
It was discovered that libxml2 incorrectly handled escaping certain large
URI strings. An attacker could possibly use this issue to cause libx
Red Hat
libxml2: libxml2: Integer overflow in xmlURIEscapeStr may lead to arbitrary code execution
vendor_redhat·2026-09-05·CVSS 6.9
CVE-2026-86139 [MEDIUM] CWE-190 libxml2: libxml2: Integer overflow in xmlURIEscapeStr may lead to arbitrary code execution
libxml2: libxml2: Integer overflow in xmlURIEscapeStr may lead to arbitrary code execution
A flaw was found in libxml2. An integer overflow vulnerability exists in the `xmlURIEscapeStr` function within `uri.c`. This flaw could potentially lead to memory corruption, allowing an attacker to achieve information disclosure or arbitrary code execution.
Package: libxml2 (Red Hat Hardened Images) - Affected
Package: swift-lang (Red Hat Hardened Images) - Affected
GHSA
In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.
ghsa_unreviewed·2026-09-05
CVE-2026-86139 [MEDIUM] CWE-190 In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.
In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.
No detection rules found.
No public exploits indexed.
2026-09-05
Published