UBUNTU-CVE-2026-77640

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Source
https://ubuntu.com/security/CVE-2026-77640
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77640.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-77640
Upstream
  • CVE-2026-77640
Published
2026-08-20T21:17:00Z
Modified
2026-09-02T19:36:34.077456395Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

tor before 0.4.9.9 was prone to an infinite loop when decompressing a truncated zlib/gzip stream with done=1. A truncated stream never reaches ZSTREAMEND, causing zlib to return ZBUFERROR with no input remaining, which bufaddcompress() mistook for a full output buffer and retried forever. Fixed by returning TORCOMPRESSERROR in that case so the caller can abort cleanly. This is TROVE-2026-021.

References

Affected packages

Ubuntu:22.04:LTS
tor

Package

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

Affected ranges

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

Affected versions

0.*
0.4.5.9-1
0.4.6.8-1
0.4.6.8-1build1
0.4.6.9-1
0.4.6.10-1
0.4.9.11-0ubuntu0.22.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.4.9.11-0ubuntu0.22.04.1",
            "binary_name": "tor"
        },
        {
            "binary_version": "0.4.9.11-0ubuntu0.22.04.1",
            "binary_name": "tor-geoipdb"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77640.json"
Ubuntu:24.04:LTS
tor

Package

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

Affected ranges

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

Affected versions

0.*
0.4.8.4-2
0.4.8.7-1
0.4.8.9-1
0.4.8.10-1
0.4.8.10-1build1
0.4.8.10-1build2
0.4.9.11-0ubuntu0.24.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.4.9.11-0ubuntu0.24.04.1",
            "binary_name": "tor"
        },
        {
            "binary_version": "0.4.9.11-0ubuntu0.24.04.1",
            "binary_name": "tor-geoipdb"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77640.json"
Ubuntu:26.04:LTS
tor

Package

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

Affected ranges

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

Affected versions

0.*
0.4.8.16-1
0.4.8.21-1
0.4.8.22-1
0.4.9.6-1
0.4.9.11-0ubuntu0.26.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.4.9.11-0ubuntu0.26.04.1",
            "binary_name": "tor"
        },
        {
            "binary_version": "0.4.9.11-0ubuntu0.26.04.1",
            "binary_name": "tor-geoipdb"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77640.json"
Ubuntu:Pro:14.04:LTS
tor

Package

Name
tor
Purl
pkg:deb/ubuntu/tor?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

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

Affected versions

0.*
0.2.3.25-1
0.2.4.19-1
0.2.4.20-1
0.2.4.27-1build0.14.04.1
0.2.4.27-1ubuntu0.1
0.2.4.27-1ubuntu0.1+esm1
0.2.4.27-1ubuntu0.1+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.2.4.27-1ubuntu0.1+esm2",
            "binary_name": "tor"
        },
        {
            "binary_version": "0.2.4.27-1ubuntu0.1+esm2",
            "binary_name": "tor-geoipdb"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77640.json"
Ubuntu:Pro:16.04:LTS
tor

Package

Name
tor
Purl
pkg:deb/ubuntu/tor?arch=source&distro=esm-apps%2Fxenial

Affected ranges

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

Affected versions

0.*
0.2.6.10-1ubuntu2
0.2.7.6-1ubuntu1
0.2.9.11-1ubuntu1~16.04.1
0.2.9.14-1ubuntu1~16.04.1
0.2.9.14-1ubuntu1~16.04.2
0.2.9.14-1ubuntu1~16.04.3
0.2.9.14-1ubuntu1~16.04.3+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.2.9.14-1ubuntu1~16.04.3+esm1",
            "binary_name": "tor"
        },
        {
            "binary_version": "0.2.9.14-1ubuntu1~16.04.3+esm1",
            "binary_name": "tor-geoipdb"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77640.json"
Ubuntu:Pro:18.04:LTS
tor

Package

Name
tor
Purl
pkg:deb/ubuntu/tor?arch=source&distro=esm-apps%2Fbionic

Affected ranges

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

Affected versions

0.*
0.3.0.10-1
0.3.1.8-2
0.3.1.9-1
0.3.2.9-1
0.3.2.9-1build1
0.3.2.10-1
0.3.2.10-1ubuntu0.1
0.3.2.10-1ubuntu0.2~esm1
0.3.2.10-1ubuntu0.2~esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.3.2.10-1ubuntu0.2~esm2",
            "binary_name": "tor"
        },
        {
            "binary_version": "0.3.2.10-1ubuntu0.2~esm2",
            "binary_name": "tor-geoipdb"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77640.json"
Ubuntu:Pro:20.04:LTS
tor

Package

Name
tor
Purl
pkg:deb/ubuntu/tor?arch=source&distro=esm-apps%2Ffocal

Affected ranges

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

Affected versions

0.*
0.4.1.5-1
0.4.1.5-1build1
0.4.1.6-1
0.4.2.5-1
0.4.2.6-1
0.4.2.7-1
0.4.2.7-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.4.2.7-1ubuntu0.1~esm1",
            "binary_name": "tor"
        },
        {
            "binary_version": "0.4.2.7-1ubuntu0.1~esm1",
            "binary_name": "tor-geoipdb"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77640.json"