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CVE Vulnerabilities

CVE-2025-6021

Integer Overflow or Wraparound

Published: Jun 12, 2025 | Modified: Feb 06, 2026
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
RedHat/V2
RedHat/V3
7.5 MODERATE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2025-6021
CWEhttps://cwe.mitre.org/data/definitions/190.html

A flaw was found in libxml2s 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.

Weakness

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.

Affected Software

NameVendorStart VersionEnd Version
Libxml2Xmlsoft*2.14.4 (excluding)
Red Hat Enterprise Linux 10RedHatlibxml2-0:2.12.5-7.el10_0*
Red Hat Enterprise Linux 7 Extended Lifecycle SupportRedHatlibxml2-0:2.9.1-6.el7_9.10*
Red Hat Enterprise Linux 8RedHatlibxml2-0:2.9.7-21.el8_10.1*
Red Hat Enterprise Linux 8RedHatlibxml2-0:2.9.7-21.el8_10.1*
Red Hat Enterprise Linux 8.2 Advanced Update SupportRedHatlibxml2-0:2.9.7-9.el8_2.3*
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportRedHatlibxml2-0:2.9.7-9.el8_4.6*
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnRedHatlibxml2-0:2.9.7-9.el8_4.6*
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportRedHatlibxml2-0:2.9.7-13.el8_6.10*
Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceRedHatlibxml2-0:2.9.7-13.el8_6.10*
Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsRedHatlibxml2-0:2.9.7-13.el8_6.10*
Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceRedHatlibxml2-0:2.9.7-16.el8_8.9*
Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsRedHatlibxml2-0:2.9.7-16.el8_8.9*
Red Hat Enterprise Linux 9RedHatlibxml2-0:2.9.13-10.el9_6*
Red Hat Enterprise Linux 9RedHatlibxml2-0:2.9.13-10.el9_6*
Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsRedHatlibxml2-0:2.9.13-1.el9_0.5*
Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsRedHatlibxml2-0:2.9.13-3.el9_2.7*
Red Hat Enterprise Linux 9.4 Extended Update SupportRedHatlibxml2-0:2.9.13-10.el9_4*
Red Hat JBoss Core Services 2.4.62.SP2RedHatlibxml2*
Red Hat OpenShift Container Platform 4.12RedHatrhcos-412.86.202509030110-0*
Red Hat OpenShift Container Platform 4.13RedHatrhcos-413.92.202509030117-0*
Red Hat OpenShift Container Platform 4.14RedHatrhcos-414.92.202508041909-0*
Red Hat OpenShift Container Platform 4.15RedHatrhcos-415.92.202508192014-0*
Red Hat OpenShift Container Platform 4.16RedHatrhcos-416.94.202508050040-0*
Red Hat OpenShift Container Platform 4.17RedHatrhcos-417.94.202508141510-0*
Red Hat OpenShift Container Platform 4.18RedHatrhcos-418.94.202508060022-0*
Red Hat OpenShift Container Platform 4.19RedHatrhcos-4.19.9.6.202507230107-0*
Red Hat Discovery 2RedHatdiscovery/discovery-server-rhel9:sha256:c517869dacaf4d3650310d4a52e83706e0b311d6ebb4a9b37b1c7acff5c142ec*
Red Hat Insights proxy 1.5RedHatinsights-proxy/insights-proxy-container-rhel9:sha256:e54a5a5f9d69dd6a03e2bcd845e2202910a188d266d4a79b12c387ceffc36f2d*
Libxml2Ubuntuesm-infra-legacy/trusty*
Libxml2Ubuntuesm-infra/bionic*
Libxml2Ubuntuesm-infra/focal*
Libxml2Ubuntuesm-infra/xenial*
Libxml2Ubuntujammy*
Libxml2Ubuntunoble*
Libxml2Ubuntuoracular*
Libxml2Ubuntuplucky*
Libxml2Ubuntuupstream*

Potential Mitigations

  • Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
  • If possible, choose a language or compiler that performs automatic bounds checking.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid [REF-1482].
  • Use libraries or frameworks that make it easier to handle numbers without unexpected consequences.
  • Examples include safe integer handling packages such as SafeInt (C++) or IntegerLib (C or C++). [REF-106]
  • Perform input validation on any numeric input by ensuring that it is within the expected range. Enforce that the input meets both the minimum and maximum requirements for the expected range.
  • Use unsigned integers where possible. This makes it easier to perform validation for integer overflows. When signed integers are required, ensure that the range check includes minimum values as well as maximum values.
  • Understand the programming language’s underlying representation and how it interacts with numeric calculation (CWE-681). Pay close attention to byte size discrepancies, precision, signed/unsigned distinctions, truncation, conversion and casting between types, “not-a-number” calculations, and how the language handles numbers that are too large or too small for its underlying representation. [REF-7]
  • Also be careful to account for 32-bit, 64-bit, and other potential differences that may affect the numeric representation.

References

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