Critical
tor — security advisory
Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.
- Products
- tor
- Affected 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, 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, 0.3.0.10-1, 0.3.1.8-2, 0.3.1.9-1, 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, 0.3.2.9-1, 0.3.2.9-1build1, 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, 0.4.5.9-1, 0.4.6.10-1, 0.4.6.8-1, 0.4.6.8-1build1, 0.4.6.9-1, 0.4.8.10-1, 0.4.8.10-1build1, 0.4.8.10-1build2, 0.4.8.14-1, 0.4.8.16-1, 0.4.8.21-1, 0.4.8.22-1, 0.4.8.4-2, 0.4.8.7-1, 0.4.8.9-1, 0.4.9.11-0ubuntu0.22.04.1, 0.4.9.11-0ubuntu0.24.04.1, 0.4.9.11-0ubuntu0.26.04.1, 0.4.9.11-1, 0.4.9.11-1build1, 0.4.9.6-1, 0.4.9.8-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-44597
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:04 UTC · Revision 1
Source evidence
Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.
osv:UBUNTU-CVE-2026-44597
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
tor
Fixed versions: Not specified
Complete source record
{
"id": "bf82f403c2fb93644456b390bc74372fcbe79e91a354da69aa68ccff714b1645",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-44597",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-44597",
"summary": "Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.",
"evidence": "osv:UBUNTU-CVE-2026-44597",
"products": [
{
"name": {
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{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
"value": "0.2.4.20-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.2.4.27-1build0.14.04.1",
"evidence": "/affected/0/versions"
},
{
"value": "0.2.4.27-1ubuntu0.1",
"evidence": "/affected/0/versions"
},
{
"value": "0.2.4.27-1ubuntu0.1+esm1",
"evidence": "/affected/0/versions"
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{
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{
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{
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"evidence": "/affected/1/versions"
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{
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"evidence": "/affected/1/versions"
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{
"value": "0.2.9.14-1ubuntu1~16.04.1",
"evidence": "/affected/1/versions"
},
{
"value": "0.2.9.14-1ubuntu1~16.04.2",
"evidence": "/affected/1/versions"
},
{
"value": "0.2.9.14-1ubuntu1~16.04.3",
"evidence": "/affected/1/versions"
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{
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{
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"evidence": "/affected/2/versions"
},
{
"value": "0.3.1.9-1",
"evidence": "/affected/2/versions"
},
{
"value": "0.3.2.9-1",
"evidence": "/affected/2/versions"
},
{
"value": "0.3.2.9-1build1",
"evidence": "/affected/2/versions"
},
{
"value": "0.3.2.10-1",
"evidence": "/affected/2/versions"
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{
"value": "0.3.2.10-1ubuntu0.1",
"evidence": "/affected/2/versions"
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{
"value": "0.3.2.10-1ubuntu0.2~esm1",
"evidence": "/affected/2/versions"
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{
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]
},
{
"name": {
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{
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"evidence": "/affected/3/versions"
},
{
"value": "0.4.1.6-1",
"evidence": "/affected/3/versions"
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{
"value": "0.4.2.5-1",
"evidence": "/affected/3/versions"
},
{
"value": "0.4.2.6-1",
"evidence": "/affected/3/versions"
},
{
"value": "0.4.2.7-1",
"evidence": "/affected/3/versions"
},
{
"value": "0.4.2.7-1ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "tor",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.4.5.9-1",
"evidence": "/affected/4/versions"
},
{
"value": "0.4.6.8-1",
"evidence": "/affected/4/versions"
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{
"value": "0.4.6.8-1build1",
"evidence": "/affected/4/versions"
},
{
"value": "0.4.6.9-1",
"evidence": "/affected/4/versions"
},
{
"value": "0.4.6.10-1",
"evidence": "/affected/4/versions"
},
{
"value": "0.4.9.11-0ubuntu0.22.04.1",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "tor",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.4.8.4-2",
"evidence": "/affected/5/versions"
},
{
"value": "0.4.8.7-1",
"evidence": "/affected/5/versions"
},
{
"value": "0.4.8.9-1",
"evidence": "/affected/5/versions"
},
{
"value": "0.4.8.10-1",
"evidence": "/affected/5/versions"
},
{
"value": "0.4.8.10-1build1",
"evidence": "/affected/5/versions"
},
{
"value": "0.4.8.10-1build2",
"evidence": "/affected/5/versions"
},
{
"value": "0.4.9.11-0ubuntu0.24.04.1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
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"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.4.8.14-1",
"evidence": "/affected/6/versions"
},
{
"value": "0.4.8.16-1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "tor",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.4.9.6-1",
"evidence": "/affected/7/versions"
},
{
"value": "0.4.9.8-1",
"evidence": "/affected/7/versions"
},
{
"value": "0.4.9.11-1",
"evidence": "/affected/7/versions"
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{
"value": "0.4.9.11-1build1",
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},
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{
"value": "0.4.8.16-1",
"evidence": "/affected/8/versions"
},
{
"value": "0.4.8.21-1",
"evidence": "/affected/8/versions"
},
{
"value": "0.4.8.22-1",
"evidence": "/affected/8/versions"
},
{
"value": "0.4.9.6-1",
"evidence": "/affected/8/versions"
},
{
"value": "0.4.9.11-0ubuntu0.26.04.1",
"evidence": "/affected/8/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2026-44597",
"aliases": [
"UBUNTU-CVE-2026-44597"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
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{
"type": "ECOSYSTEM",
"events": [
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}
],
"package": {
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"purl": "pkg:deb/ubuntu/tor?arch=source&distro=esm-infra-legacy%2Ftrusty",
"ecosystem": "Ubuntu:Pro:14.04:LTS"
},
"versions": [
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"0.2.4.27-1ubuntu0.1",
"0.2.4.27-1ubuntu0.1+esm1",
"0.2.4.27-1ubuntu0.1+esm2"
],
"database_specific": {
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},
"ecosystem_specific": {
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},
{
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},
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},
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},
"ecosystem_specific": {
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{
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},
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],
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},
"ecosystem_specific": {
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{
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"binary_version": "0.4.9.11-0ubuntu0.22.04.1"
},
{
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}
]
}
},
{
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},
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],
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},
"ecosystem_specific": {
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},
{
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},
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},
"ecosystem_specific": {
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},
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}
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}
},
{
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],
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},
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},
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},
{
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"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
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"0.4.8.21-1",
"0.4.8.22-1",
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"0.4.9.11-0ubuntu0.26.04.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44597.json"
},
"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"
}
]
}
}
],
"modified": "2026-10-17T13:00:08.721831955Z",
"provider": "osv",
"upstream": [
"CVE-2026-44597"
],
"references": [
"https://ubuntu.com/security/CVE-2026-44597",
"https://www.cve.org/CVERecord?id=CVE-2026-44597",
"https://forum.torproject.org/c/news/tor-release-announcement/28",
"https://www.openwall.com/lists/oss-security/2026/05/06/8",
"https://gitlab.torproject.org/tpo/core/tor/-/work_items/41254",
"https://gitlab.torproject.org/tpo/core/tor/-/commit/8f98054b1982d00a14639864d03e9afd90b87481"
]
},
"related_cves": [
{
"value": "CVE-2026-44597",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 360365,
"published_at": "2026-05-07T01:16:00+00:00"
}