CVE-2025-6021

CWE-787 — Out-of-bounds WriteCWE-121 — Stack-based Buffer OverflowCWE-190 — Integer Overflow12 documents10 sources
Severity
7.5HIGH
EPSS
2.1%
top 15.88%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
19
Xmlsoft Libxml2Redhat Enterprise LinuxRedhat Enterprise Linux EUS+16 more
Timeline
PublishedJun 12
Latest updateJan 15

Description

A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages6 packages

▶NVDxmlsoft/libxml2< 2.14.4
▶Debianlibxml2< 2.9.10+dfsg-6.7+deb11u8+3
▶Ubuntulibxml2< 2.9.13+dfsg-1ubuntu0.8+5
▶RubyGemsnokogiri< 1.18.9

Also affects: Enterprise Linux 10.0, 8.0, 9.0, 8.4, 8.6, 8.8, 9.4, 9.6, 8.2, 9.2, Openshift Container Platform 4.12, 4.13, 4.14, 4.15, 4.16, 4.17, 4.18

🔴Vulnerability Details

6
OSV
libxml2 vulnerabilities↗2025-08-14
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OSV
Nokogiri patches vendored libxml2 to resolve multiple CVEs↗2025-07-21
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GHSA
Nokogiri patches vendored libxml2 to resolve multiple CVEs↗2025-07-21
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CVEList
Libxml2: integer overflow in xmlbuildqname() leads to stack buffer overflow in libxml2↗2025-06-12
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GHSA
GHSA-32vr-5hxf-x93f: A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow↗2025-06-12
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📋Vendor Advisories

5
Oracle
Oracle Oracle Java SE Risk Matrix: JavaFX (libxml2) — CVE-2025-6021↗2026-01-15
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Ubuntu
libxml2 vulnerabilities↗2025-08-14
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Red Hat
libxml2: Integer Overflow in xmlBuildQName() Leads to Stack Buffer Overflow in libxml2↗2025-06-12
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Microsoft
Libxml2: integer overflow in xmlbuildqname() leads to stack buffer overflow in libxml2↗2025-06-10
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Debian
CVE-2025-6021: libxml2 - A flaw was found in libxml2's xmlBuildQName function, where integer overflows in...↗2025
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