DEBIAN-CVE-2026-78681

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Source
https://security-tracker.debian.org/tracker/CVE-2026-78681
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-78681.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-78681
Upstream
Published
2026-08-25T02:16:52Z
Modified
2026-09-14T17:03:34Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
Summary
[none]
Details

NLTK versions before 3.10.3 use xml.etree.ElementTree to parse XML in multiple modules, which honors entity declarations in document DTDs. Attackers can craft XML payloads with nested entity declarations that expand from hundreds of bytes to megabytes in memory, causing denial of service.

References

Affected packages

Debian:12 / nltk

Package

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

Affected ranges

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

Affected versions

3.*
3.8-1
3.8.1-1
3.9.1-1
3.9.1-2
3.9.2-1
3.9.3-1
3.10.0-1
3.10.1-1
3.10.3-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-78681.json"

Debian:13 / nltk

Package

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

Affected ranges

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

Affected versions

3.*
3.9.1-2
3.9.2-1
3.9.3-1
3.10.0-1
3.10.1-1
3.10.3-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-78681.json"

Debian:14 / nltk

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
3.10.3-1

Affected versions

3.*
3.9.1-2
3.9.2-1
3.9.3-1
3.10.0-1
3.10.1-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-78681.json"