CVE-2026-66046

Expat through 2.8.3 has quadratic complexity in storeAtts() in xmlparse.c when processing N attributes with non-normalized values, enabling remote unauthenticated DoS via a small XML document. CVSS 7.5 HIGH. No exploitation observed. Fix: upgrade to patched version (PR #1321).

CVE-2026-66046

Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts function in xmlparse.c, where processing N specified attributes with non-normalized values triggers an ON^2 linear scan of elementType-defaultAtts to determine CDATA status. ...

CVE-2026-66046

Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts function in xmlparse.c, where processing N specified attributes with non-normalized values triggers an ON^2 linear scan of elementType-defaultAtts to determine CDATA status. ...

CVE-2026-66046: Inefficient Algorithmic Complexity

Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts function in xmlparse.c, where processing N specified attributes with non-normalized values triggers an ON^2 linear scan of elementType-defaultAtts to determine CDATA status. ...

CVE-2026-66046: Inefficient Algorithmic Complexity

Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts function in xmlparse.c, where processing N specified attributes with non-normalized values triggers an ON^2 linear scan of elementType-defaultAtts to determine CDATA status. ...

expat2 -- Inefficient Algorithmic Complexity

https://github.com/libexpat/libexpat/pull/1321 reports: Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in the storeAtts function in xmlparse.c, where processing N specified attributes with non-normalized values triggers an ON^2 linear sca...

Unity Linux 20.1070e Security Update: expat (UTSA-2026-099462)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-099462 advisory. libexpat before 2.8.2 has an integer overflow in storeAtts. Tenable has extracted the preceding description block directly from the Unity Linux security advisory. No...

JLSEC-2026-1227

libexpat before 2.8.2 has an integer overflow in storeAtts...

PT-2026-80470

libexpat before 2.8.2 has an integer overflow in storeAtts...

libexpat before 2.8.2 has an integer overflow in storeAtts.

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SUSE CVE-2026-56403

libexpat before 2.8.2 has an integer overflow in storeAtts...

Integer Overflow or Wraparound

Overview Affected versions of this package are vulnerable to Integer Overflow or Wraparound due to improper handling of integer values in the storeAtts function. An attacker can cause memory corruption or potentially execute arbitrary code by providing specially crafted input that triggers the...

CVE-2026-56403

libexpat before 2.8.2 has an integer overflow in storeAtts...

ALPINE-CVE-2026-56403

libexpat before 2.8.2 has an integer overflow in storeAtts...

AZL-90240 CVE-2026-56403 affecting package expat for versions less than 2.8.2-1

libexpat before 2.8.2 has an integer overflow in storeAtts...

UBUNTU-CVE-2026-56403

libexpat before 2.8.2 has an integer overflow in storeAtts...

CVE-2026-56403

libexpat before 2.8.2 has an integer overflow in storeAtts...

CVE-2026-56403

libexpat before 2.8.2 has an integer overflow in storeAtts...

CVE-2026-56403

libexpat before 2.8.2 has an integer overflow in storeAtts...

CVE-2026-56403

libexpat before 2.8.2 has an integer overflow in storeAtts...