一、漏洞信息
漏洞编号：CVE-2026-77214
漏洞归属组件：expat
漏洞归属的版本：2.8.1
CVSS评分：
BaseScore：8.2 High
Vector：CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
漏洞简述：
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.
漏洞公开时间：2026-10-07 23:17:53
漏洞创建时间：2026-10-06 16:59:48
漏洞详情参考链接：
https://nvd.nist.gov/vuln/detail/CVE-2026-77214

漏洞分析指导链接：
https://atomgit.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
漏洞数据来源:
其他
漏洞补丁信息：

二、漏洞分析结构反馈
影响性分析说明：
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.
openEuler评分：
8.2
Vector：CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
受影响版本排查(受影响/不受影响)：
1.master(2.8.5):受影响
2.openEuler-20.03-LTS-SP4(2.2.9):受影响
3.openEuler-22.03-LTS-SP4(2.4.1):受影响
4.openEuler-24.03-LTS-Next(2.8.5):受影响
5.openEuler-24.03-LTS-SP1(2.5.0):受影响
6.openEuler-24.03-LTS-SP3(2.5.0):受影响
7.openEuler-24.03-LTS-SP4(2.8.1):受影响

修复是否涉及abi变化(是/否)：
1.master(2.8.5):否
2.openEuler-20.03-LTS-SP4(2.2.9):否
3.openEuler-22.03-LTS-SP4(2.4.1):否
4.openEuler-24.03-LTS-Next(2.8.5):否
5.openEuler-24.03-LTS-SP1(2.5.0):否
6.openEuler-24.03-LTS-SP3(2.5.0):否
7.openEuler-24.03-LTS-SP4(2.8.1):否

原因说明：
1.master(2.8.5):正常修复
2.openEuler-20.03-LTS-SP4(2.2.9):正常修复
3.openEuler-22.03-LTS-SP4(2.4.1):正常修复
4.openEuler-24.03-LTS-Next(2.8.5):正常修复
5.openEuler-24.03-LTS-SP1(2.5.0):正常修复
6.openEuler-24.03-LTS-SP3(2.5.0):正常修复
7.openEuler-24.03-LTS-SP4(2.8.1):正常修复