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    CVE-2026-56406

    libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in XML_Parse.

    Published:Jun 21, 2026
    Last Modified:Jun 22, 2026
    EPS:Jun 21, 2026
    EPSS Score:
    CVSS Score:6.9

    Affected Products

    Vendor
    Libexpat Project
    Product
    Libexpat

    Exploits

    No exploit reference

    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…

    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