DEBIAN-CVE-2026-117556

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Source
https://security-tracker.debian.org/tracker/CVE-2026-117556
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-117556.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-117556
Upstream
Published
2026-10-27T14:16:36Z
Modified
2026-10-29T10:00:17Z
Severity
  • 5.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/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

zchunk before 1.5.5 contains a heap out-of-bounds read vulnerability in read_preface() in src/lib/header.c that passes the total header length instead of remaining bytes to compint parsing functions. Attackers can supply a crafted .zck file whose header ends inside a compressed integer, causing reads past the heap header buffer and crashing the application.

References

Affected packages

Debian:12 / zchunk

Package

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

Affected ranges

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

Affected versions

1.*
1.2.3+ds1-2
1.3.0+ds1-0.1
1.3.1+ds1-1~bpo12+1
1.3.1+ds1-1
1.3.2+ds1-1
1.4.0+ds1-1
1.5.1+ds1-1~bpo12+1
1.5.1+ds1-1
1.5.2+ds1-1
1.5.2+ds1-2
1.5.3+ds1-1
1.5.3+ds1-2

Ecosystem specific 

{
    "urgency":  "unimportant"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-117556.json"

Debian:13 / zchunk

Package

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

Affected ranges

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

Affected versions

1.*
1.5.1+ds1-1
1.5.2+ds1-1
1.5.2+ds1-2
1.5.3+ds1-1
1.5.3+ds1-2

Ecosystem specific 

{
    "urgency":  "unimportant"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-117556.json"

Debian:14 / zchunk

Package

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

Affected ranges

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

Affected versions

1.*
1.5.1+ds1-1
1.5.2+ds1-1
1.5.2+ds1-2
1.5.3+ds1-1
1.5.3+ds1-2

Ecosystem specific 

{
    "urgency":  "unimportant"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-117556.json"