ubuntu-cve-2026-77641
Vulnerability from osv_ubuntu
Published
2026-08-20 21:17
Modified
2026-09-10 09:05
Summary
Details
tor before 0.4.9.9 was prone to a NULL write after free when sending a CONFLUX_SWITCH cell fails. The return value of relay_send_command_from_edge() was ignored, so a send failure (which calls circuit_mark_for_close() and removes the leg via cfx_del_leg()) would go undetected, causing the caller to write to the now-freed current leg and resulting in a crash. This is TROVE-2026-017.
Severity
6.5 (Medium)
8.2 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "tor",
"binary_version": "0.2.4.27-1ubuntu0.1+esm2"
},
{
"binary_name": "tor-geoipdb",
"binary_version": "0.2.4.27-1ubuntu0.1+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "tor",
"purl": "pkg:deb/ubuntu/tor@0.2.4.27-1ubuntu0.1+esm2?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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_name": "tor",
"binary_version": "0.2.9.14-1ubuntu1~16.04.3+esm1"
},
{
"binary_name": "tor-geoipdb",
"binary_version": "0.2.9.14-1ubuntu1~16.04.3+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "tor",
"purl": "pkg:deb/ubuntu/tor@0.2.9.14-1ubuntu1~16.04.3+esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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_name": "tor",
"binary_version": "0.3.2.10-1ubuntu0.2~esm2"
},
{
"binary_name": "tor-geoipdb",
"binary_version": "0.3.2.10-1ubuntu0.2~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "tor",
"purl": "pkg:deb/ubuntu/tor@0.3.2.10-1ubuntu0.2~esm2?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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_name": "tor",
"binary_version": "0.4.2.7-1ubuntu0.1~esm1"
},
{
"binary_name": "tor-geoipdb",
"binary_version": "0.4.2.7-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "tor",
"purl": "pkg:deb/ubuntu/tor@0.4.2.7-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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_name": "tor",
"binary_version": "0.4.9.11-0ubuntu0.22.04.1"
},
{
"binary_name": "tor-geoipdb",
"binary_version": "0.4.9.11-0ubuntu0.22.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "tor",
"purl": "pkg:deb/ubuntu/tor@0.4.9.11-0ubuntu0.22.04.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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_name": "tor",
"binary_version": "0.4.9.11-0ubuntu0.24.04.1"
},
{
"binary_name": "tor-geoipdb",
"binary_version": "0.4.9.11-0ubuntu0.24.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "tor",
"purl": "pkg:deb/ubuntu/tor@0.4.9.11-0ubuntu0.24.04.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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_name": "tor",
"binary_version": "0.4.9.11-0ubuntu0.26.04.1"
},
{
"binary_name": "tor-geoipdb",
"binary_version": "0.4.9.11-0ubuntu0.26.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "tor",
"purl": "pkg:deb/ubuntu/tor@0.4.9.11-0ubuntu0.26.04.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"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"
]
}
],
"aliases": [],
"details": "tor before 0.4.9.9 was prone to a\u00a0NULL write after free when sending a CONFLUX_SWITCH cell fails. The return value of relay_send_command_from_edge() was ignored, so a send failure (which calls circuit_mark_for_close() and removes the leg via cfx_del_leg()) would go undetected, causing the caller to write to the now-freed current leg and resulting in a crash. This is TROVE-2026-017.",
"id": "UBUNTU-CVE-2026-77641",
"modified": "2026-09-10T09:05:17Z",
"published": "2026-08-20T21:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-77641"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-77641"
},
{
"type": "REPORT",
"url": "https://gitlab.torproject.org/tpo/core/tor/-/work_items/41263"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-77641"
]
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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