DEBIAN-CVE-2026-93990

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Source
https://security-tracker.debian.org/tracker/CVE-2026-93990
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93990.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-93990
Upstream
Published
2026-09-19T23:17:10Z
Modified
2026-09-20T10:00:10Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Debian:12 / expat

Package

Name
expat
Purl
pkg:deb/debian/expat?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.5.0-1
2.5.0-1+deb12u1
2.5.0-1+deb12u2
2.5.0-1+deb12u3
2.5.0-2
2.6.0-1
2.6.1-1
2.6.1-2
2.6.2-1
2.6.2-2
2.6.3-1
2.6.3-2
2.6.4-1
2.7.0-1
2.7.1-1
2.7.1-2
2.7.2-1
2.7.3-1
2.7.3-2
2.7.4-1
2.7.5-1
2.8.0-1
2.8.0-2
2.8.1-1
2.8.2-1~deb13u1
2.8.2-1
2.8.3-1~deb13u1
2.8.3-1
2.8.4-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93990.json"

Debian:13 / expat

Package

Name
expat
Purl
pkg:deb/debian/expat?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.7.1-2
2.7.2-1
2.7.3-1
2.7.3-2
2.7.4-1
2.7.5-1
2.8.0-1
2.8.0-2
2.8.1-1
2.8.2-1~deb13u1
2.8.2-1
2.8.3-1~deb13u1
2.8.3-1
2.8.4-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93990.json"

Debian:14 / expat

Package

Name
expat
Purl
pkg:deb/debian/expat?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.7.1-2
2.7.2-1
2.7.3-1
2.7.3-2
2.7.4-1
2.7.5-1
2.8.0-1
2.8.0-2
2.8.1-1
2.8.2-1~deb13u1
2.8.2-1
2.8.3-1~deb13u1
2.8.3-1
2.8.4-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-93990.json"