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    CVE-2026-76957

    libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.

    Published:Aug 20, 2026
    Last Modified:Aug 20, 2026
    EPS:Aug 20, 2026
    EPSS Score:0.00102
    CVSS Score:4.9

    Affected Products

    Vendor
    Libexpat Project
    Product
    Libexpat

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    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…
    CVE-2026-56406 (CVSS 6.9) — libexpat before 2.8.2 has an integer overflow in XML_ParseBuffer because it lacked a check that was present in…

    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