OESA-2026-4351

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Source
https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-4351
Import Source
https://repo.openeuler.org/security/data/osv/OESA-2026-4351.json
JSON Data
https://api.test.osv.dev/v1/vulns/OESA-2026-4351
Upstream
Published
2026-10-16T11:59:39Z
Modified
2026-10-16T12:15:15Z
Severity
  • 8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L CVSS Calculator
Summary
expat security update
Details

expat is a stream-oriented XML parser library written in C. expat excels with files too large to fit RAM, and where performance and flexibility are crucial.

Security Fix(es):

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.(CVE-2026-77214)

Database specific 
{
    "severity":  "High"
}
References

Affected packages

openEuler:24.03-LTS-SP4 / expat

Package

Name
expat
Purl
pkg:rpm/openEuler/expat&distro=openEuler-24.03-LTS-SP4

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.8.1-10.oe2403sp4

Ecosystem specific 

{
    "aarch64":  [
        "expat-2.8.1-10.oe2403sp4.aarch64.rpm",
        "expat-debuginfo-2.8.1-10.oe2403sp4.aarch64.rpm",
        "expat-debugsource-2.8.1-10.oe2403sp4.aarch64.rpm",
        "expat-devel-2.8.1-10.oe2403sp4.aarch64.rpm"
    ],
    "noarch":  [
        "expat-help-2.8.1-10.oe2403sp4.noarch.rpm"
    ],
    "src":  [
        "expat-2.8.1-10.oe2403sp4.src.rpm"
    ],
    "x86_64":  [
        "expat-2.8.1-10.oe2403sp4.x86_64.rpm",
        "expat-debuginfo-2.8.1-10.oe2403sp4.x86_64.rpm",
        "expat-debugsource-2.8.1-10.oe2403sp4.x86_64.rpm",
        "expat-devel-2.8.1-10.oe2403sp4.x86_64.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-4351.json"