expat security update
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): Expat through 2.8.4 fails to validate low surrogates following high surrogates in UTF-16 input, allowing malformed UTF-16 sequences to be accepted. Attackers can craft UTF-16 encoded XML with lone high surrogates that consume following code units, hiding markup characters from the parser and enabling XML injection attacks.(CVE-2026-93990)
OESA-2026-4175
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:OESA-2026-4175
expat
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 2.4.1-32.oe2203sp4
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2.4.1-32.oe2203sp4"
}
]
}
],
"package": {
"name": "expat",
"purl": "pkg:rpm/openEuler/expat&distro=openEuler-22.03-LTS-SP4",
"ecosystem": "openEuler:22.03-LTS-SP4"
},
"database_specific": {
"source": "https://repo.openeuler.org/security/data/osv/OESA-2026-4175.json"
},
"ecosystem_specific": {
"src": [
"expat-2.4.1-32.oe2203sp4.src.rpm"
],
"noarch": [
"expat-help-2.4.1-32.oe2203sp4.noarch.rpm"
],
"x86_64": [
"expat-2.4.1-32.oe2203sp4.x86_64.rpm",
"expat-debuginfo-2.4.1-32.oe2203sp4.x86_64.rpm",
"expat-debugsource-2.4.1-32.oe2203sp4.x86_64.rpm",
"expat-devel-2.4.1-32.oe2203sp4.x86_64.rpm"
],
"aarch64": [
"expat-2.4.1-32.oe2203sp4.aarch64.rpm",
"expat-debuginfo-2.4.1-32.oe2203sp4.aarch64.rpm",
"expat-debugsource-2.4.1-32.oe2203sp4.aarch64.rpm",
"expat-devel-2.4.1-32.oe2203sp4.aarch64.rpm"
]
}
}
]Publisher severity
high
Source reference: /database_specific/severity
- Event
- #52103 · Revision 1
- Added to Heist Feed
- Publisher date