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    CVE-2021-46143

    In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for m_groupSize.

    Published:Jan 6, 2022
    Last Modified:May 5, 2025
    EPS:Jan 6, 2022
    EPSS Score:0.04085
    CVSS Score:8.1

    Affected Products

    Vendor
    Libexpat Project
    Product
    Libexpat
    Vendor
    Netapp
    Product
    Active Iq Unified Manager
    Vendor
    Netapp
    Product
    Clustered Data Ontap
    Vendor
    Netapp
    Product
    Hci Baseboard Management Controller
    Vendor
    Netapp
    Product
    Oncommand Workflow Automation
    Vendor
    Netapp
    Product
    Solidfire \& Hci Management Node
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Jboss Core Services
    Vendor
    Siemens
    Product
    Sinema Remote Connect Server
    Vendor
    Tenable
    Product
    Nessus

    Exploits

    https://github.com/libexpat/libexpat/issues/532https://github.com/libexpat/libexpat/issues/532https://github.com/nanopathi/external_expat_AOSP10_r33_CVE-2021-46143

    Common Weakness Enumeration

    CWE-190 Integer Overflow or Wraparound

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-76957 (CVSS 4.9) — libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free…
    CVE-2026-76956 (CVSS 5.9) — In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient …
    CVE-2026-66046 (CVSS 8.7) — Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in t…
    CVE-2026-72522 (CVSS 6.2) — libexpat before 2.8.3 has an out-of-bounds read and resultant infinite loop because low surrogates are treated…
    CVE-2026-56412 (CVSS 4.9) — libexpat before 2.8.2 does not consider XML_TOK_DATA_CHARS in doCdataSection and thus lacks handler call depth…
    CVE-2026-56411 (CVSS 6.9) — xmlwf in libexpat before 2.8.2 has an integer overflow in endDoctypeDecl via NOTATION declarations.…
    CVE-2026-56410 (CVSS 6.9) — xmlwf in libexpat before 2.8.2 has an integer overflow in resolveSystemId.…
    CVE-2026-56409 (CVSS 6.5) — xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.…
    CVE-2026-56408 (CVSS 6.9) — libexpat before 2.8.2 has an integer overflow in copyString.…
    CVE-2026-56407 (CVSS 6.9) — libexpat before 2.8.2 has an integer overflow in doProlog that is related to storeEntityValue and entity textL…

    References

    http://www.openwall.com/lists/oss-security/2022/01/17/3
    https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
    https://github.com/libexpat/libexpat/issues/532
    https://github.com/libexpat/libexpat/pull/538
    https://security.gentoo.org/glsa/202209-24
    https://security.netapp.com/advisory/ntap-20220121-0006/
    https://www.debian.org/security/2022/dsa-5073
    https://www.tenable.com/security/tns-2022-05
    http://www.openwall.com/lists/oss-security/2022/01/17/3
    https://cert-portal.siemens.com/productcert/pdf/ssa-484086.pdf
    https://github.com/libexpat/libexpat/issues/532
    https://github.com/libexpat/libexpat/pull/538
    https://security.gentoo.org/glsa/202209-24
    https://security.netapp.com/advisory/ntap-20220121-0006/
    https://www.debian.org/security/2022/dsa-5073
    https://www.tenable.com/security/tns-2022-05

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High