High
7zip, p7zip — security advisory
7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the processing of XZ chunked data. Crafted XZ-compressed data can trigger an overflow of a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-30169.
- Products
- 7zip, p7zip
- Affected versions
- 16.02+dfsg-4, 16.02+dfsg-5, 16.02+dfsg-6, 16.02+dfsg-7, 16.02+dfsg-7build1, 16.02+dfsg-8, 21.03~beta+dfsg-6, 21.04~beta+dfsg-1, 21.06+dfsg-1, 21.07+dfsg-1, 21.07+dfsg-2, 21.07+dfsg-3, 21.07+dfsg-4, 21.07+dfsg-4ubuntu0.1~esm1, 23.01+dfsg-11, 23.01+dfsg-11ubuntu0.1~esm1, 23.01+dfsg-3, 23.01+dfsg-7, 23.01+dfsg-8, 25.01+dfsg-2, 25.01+dfsg-3, 25.01+dfsg-4, 25.01+dfsg-5, 26.00+dfsg-1, 26.01+dfsg-2, 26.01+dfsg-3, 26.02+dfsg-1, 26.02+dfsg-2, 9.20.1~dfsg.1-4, 9.20.1~dfsg.1-4+deb7u1build0.14.04.1, 9.20.1~dfsg.1-4+deb7u2build0.14.04.1, 9.20.1~dfsg.1-4+deb7u3build0.14.04.1, 9.20.1~dfsg.1-4.2, 9.20.1~dfsg.1-4.2ubuntu0.1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-14266
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:03 UTC · Revision 1
Source evidence
7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the processing of XZ chunked data. Crafted XZ-compressed data can trigger an overflow of a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-30169.
osv:UBUNTU-CVE-2026-14266
p7zip
Fixed versions: Not specified
p7zip
Fixed versions: Not specified
p7zip
Fixed versions: Not specified
p7zip
Fixed versions: Not specified
p7zip
Fixed versions: Not specified
7zip
Fixed versions: Not specified
7zip
Fixed versions: Not specified
7zip
Fixed versions: Not specified
7zip
Fixed versions: Not specified
Complete source record
{
"id": "aa865a34c6624e80cb6e8b1e369e80b3a4b875f649d6719aaafe1c517508ba59",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-14266",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-14266",
"summary": "7-Zip XZ Decompression Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the processing of XZ chunked data. Crafted XZ-compressed data can trigger an overflow of a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-30169.",
"evidence": "osv:UBUNTU-CVE-2026-14266",
"products": [
{
"name": {
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},
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{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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"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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}
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{
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{
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},
{
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"evidence": "/affected/2/versions"
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{
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{
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{
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}
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},
{
"name": {
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},
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"affected_versions": [
{
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"evidence": "/affected/4/versions"
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},
{
"name": {
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},
"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/5/versions"
},
{
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"evidence": "/affected/5/versions"
},
{
"value": "21.06+dfsg-1",
"evidence": "/affected/5/versions"
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{
"value": "21.07+dfsg-1",
"evidence": "/affected/5/versions"
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{
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"evidence": "/affected/5/versions"
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{
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"evidence": "/affected/5/versions"
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{
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"evidence": "/affected/5/versions"
},
{
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"evidence": "/affected/5/versions"
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]
},
{
"name": {
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"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "23.01+dfsg-3",
"evidence": "/affected/6/versions"
},
{
"value": "23.01+dfsg-7",
"evidence": "/affected/6/versions"
},
{
"value": "23.01+dfsg-8",
"evidence": "/affected/6/versions"
},
{
"value": "23.01+dfsg-11",
"evidence": "/affected/6/versions"
},
{
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"evidence": "/affected/6/versions"
}
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},
{
"name": {
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"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "26.00+dfsg-1",
"evidence": "/affected/7/versions"
},
{
"value": "26.01+dfsg-2",
"evidence": "/affected/7/versions"
},
{
"value": "26.01+dfsg-3",
"evidence": "/affected/7/versions"
},
{
"value": "26.02+dfsg-1",
"evidence": "/affected/7/versions"
},
{
"value": "26.02+dfsg-2",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "7zip",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "25.01+dfsg-2",
"evidence": "/affected/8/versions"
},
{
"value": "25.01+dfsg-3",
"evidence": "/affected/8/versions"
},
{
"value": "25.01+dfsg-4",
"evidence": "/affected/8/versions"
},
{
"value": "25.01+dfsg-5",
"evidence": "/affected/8/versions"
},
{
"value": "26.00+dfsg-1",
"evidence": "/affected/8/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-14266",
"aliases": [
"UBUNTU-CVE-2026-14266"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
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"events": [
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"package": {
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"purl": "pkg:deb/ubuntu/p7zip?arch=source&distro=trusty",
"ecosystem": "Ubuntu:14.04:LTS"
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"versions": [
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"9.20.1~dfsg.1-4+deb7u3build0.14.04.1"
],
"database_specific": {
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},
"ecosystem_specific": {
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"binary_version": "9.20.1~dfsg.1-4+deb7u3build0.14.04.1"
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},
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},
"ecosystem_specific": {
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"binary_version": "9.20.1~dfsg.1-4.2ubuntu0.1"
},
{
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}
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{
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"package": {
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"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"16.02+dfsg-4",
"16.02+dfsg-5",
"16.02+dfsg-6"
],
"database_specific": {
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},
"ecosystem_specific": {
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},
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"21.07+dfsg-4",
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},
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},
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},
"ecosystem_specific": {
"binaries": [
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},
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],
"package": {
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},
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},
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},
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}
},
{
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},
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"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
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},
{
"binary_name": "7zip-standalone",
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}
]
}
}
],
"modified": "2026-10-17T12:58:05.616222547Z",
"provider": "osv",
"upstream": [
"CVE-2026-14266"
],
"references": [
"https://ubuntu.com/security/CVE-2026-14266",
"https://www.cve.org/CVERecord?id=CVE-2026-14266",
"https://www.zerodayinitiative.com/advisories/ZDI-26-444/"
]
},
"related_cves": [
{
"value": "CVE-2026-14266",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 358038,
"published_at": "2026-07-29T18:16:00+00:00"
}