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CVE-2026-93990

Expat before 2.8.5 Malformed UTF-16 Acceptance via Unchecked Surrogate

Expat before 2.8.5 fails to validate that a high surrogate in UTF-16 input is followed by a low surrogate, allowing malformed UTF-16 sequences to be accepted. Attackers can supply UTF-16 encoded XML containing lone high surrogates that consume the following code unit, causing Expat to pass unpaired surrogates to applications built with XML_UNICODE and to silently replace input characters in other builds.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Libexpat Libexpat Project
Products
Expat Libexpat
CVE-2026-77214

libexpat Heap Buffer Over-read in xmlparse.c via XML_ParseBuffer

libexpat before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c. XML_ParseBuffer advances the parse buffer end with parser->m_bufferEnd += len using a caller-supplied length that is not validated against the allocated buffer size, so repeated XML_ParseBuffer calls move m_bufferEnd past the end of the heap allocation and subsequent parsing reads out of bounds. Reaching this path requires a parse buffer to already be present; otherwise XML_ParseBuffer returns XML_ERROR_NO_BUFFER. A buffer is present after a prior call to XML_GetBuffer, either directly (the common case) or indirectly through a prior XML_Parse call that allocates the buffer internally. The over-read discloses adjacent heap memory to the calling application, recovering heap pointers, libc function pointers, and code pointers sufficient to defeat ASLR and build further exploitation primitives.

CVSS 4.0 · 8.3 High EPSS < 1% KEV · Not listed
Vendors
Libexpat Libexpat Project
Products
Expat Libexpat
CVE-2026-102633

libexpat 2.7.2 through 2.8.5 Integer Overflow in expat_realloc

libexpat versions 2.7.2 through 2.8.5 contain an integer overflow vulnerability in expat_realloc() function on 32-bit platforms when computing allocation sizes. Attackers supplying malicious XML to applications parsing with vulnerable libexpat can cause heap buffer overflow, memory corruption, or denial of service.

CVSS 4.0 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Libexpat Libexpat Project
Products
Expat Libexpat
CVE-2026-76641

Expat Out-of-Bounds Read via dtdCopy

Expat through 2.8.3 contains an out-of-bounds read vulnerability that allows attackers to trigger memory corruption by processing XML with external entity parsers created via XML_ExternalEntityParserCreate. A struct size mismatch between ELEMENT_TYPE members causes storeAtts to read the attIndex member past allocated memory boundaries, resulting in failure to normalize whitespace in non-CDATA attributes or a wild pointer dereference causing a segfault. This vulnerability was introduced by the fix for CVE-2026-66046.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Libexpat Libexpat Project
Products
Expat Libexpat