CVE-2026-77214
- Source
- https://cve.org/CVERecord?id=CVE-2026-77214
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-77214.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-77214
- Downstream
- Published
- 2026-10-07T14:35:42Z
- Modified
- 2026-10-08T02:52:01Z
- Severity
-
- 8.3 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- libexpat Heap Buffer Over-read in xmlparse.c via XML_ParseBuffer
- Details
-
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.
- Database specific
{ "cna_assigner": "VulnCheck", "cwe_ids": [ "CWE-125" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77214.json" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77214.json
- https://github.com/libexpat/libexpat
- https://github.com/libexpat/libexpat/commit/13c5f63a7f1c52c2feee3b16a1134d4fb68e9ea0
- https://github.com/libexpat/libexpat/pull/1393
- https://nvd.nist.gov/vuln/detail/CVE-2026-77214
- https://www.vulncheck.com/advisories/libexpat-heap-buffer-over-read-in-xmlparse-c-via-xml-parsebuffer