UBUNTU-CVE-2026-117556

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-117556
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-117556.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-117556
Upstream
Published
2026-10-27T14:16:00Z
Modified
2026-10-28T20:17:46Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L CVSS Calculator
  • 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 CVSS Calculator
  • Ubuntu - medium
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

Ubuntu:22.04:LTS / zchunk

Package

Name
zchunk
Purl
pkg:deb/ubuntu/zchunk?arch=source&distro=jammy

Affected ranges

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

Affected versions

1.*
1.1.9+ds1-1
1.1.16+ds1-1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libzck1",
            "binary_version":  "1.1.16+ds1-1"
        },
        {
            "binary_name":  "zchunk",
            "binary_version":  "1.1.16+ds1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-117556.json"

Ubuntu:24.04:LTS / zchunk

Package

Name
zchunk
Purl
pkg:deb/ubuntu/zchunk?arch=source&distro=noble

Affected ranges

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

Affected versions

1.*
1.3.1+ds1-1
1.3.2+ds1-1
1.3.2+ds1-1build1
1.3.2+ds1-1build2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libzck1",
            "binary_version":  "1.3.2+ds1-1build2"
        },
        {
            "binary_name":  "zchunk",
            "binary_version":  "1.3.2+ds1-1build2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-117556.json"

Ubuntu:26.10 / zchunk

Package

Name
zchunk
Purl
pkg:deb/ubuntu/zchunk?arch=source&distro=stonking

Affected ranges

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

Affected versions

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

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libzck1",
            "binary_version":  "1.5.3+ds1-1"
        },
        {
            "binary_name":  "zchunk",
            "binary_version":  "1.5.3+ds1-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-117556.json"

Ubuntu:26.04:LTS / zchunk

Package

Name
zchunk
Purl
pkg:deb/ubuntu/zchunk?arch=source&distro=resolute

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

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libzck1",
            "binary_version":  "1.5.2+ds1-2"
        },
        {
            "binary_name":  "zchunk",
            "binary_version":  "1.5.2+ds1-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-117556.json"