CriticalFix available
nginx — security advisory
A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and the root directive or access log format references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or to possibly trigger a code execution. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
- Products
- nginx
- Affected versions
- 1.10.0-0ubuntu0.16.04.1, 1.10.0-0ubuntu0.16.04.2, 1.10.0-0ubuntu0.16.04.3, 1.10.0-0ubuntu0.16.04.4, 1.10.3-0ubuntu0.16.04.1, 1.10.3-0ubuntu0.16.04.2, 1.10.3-0ubuntu0.16.04.3, 1.10.3-0ubuntu0.16.04.4, 1.10.3-0ubuntu0.16.04.5, 1.10.3-0ubuntu0.16.04.5+esm1, 1.10.3-0ubuntu0.16.04.5+esm2, 1.10.3-0ubuntu0.16.04.5+esm3, 1.10.3-0ubuntu0.16.04.5+esm4, 1.10.3-0ubuntu0.16.04.5+esm5, 1.10.3-0ubuntu0.16.04.5+esm6, 1.10.3-0ubuntu0.16.04.5+esm7, 1.10.3-0ubuntu0.16.04.5+esm9, 1.12.1-0ubuntu2, 1.13.10-1ubuntu1, 1.13.12-0ubuntu1, 1.13.6-2ubuntu1, 1.13.6-2ubuntu2, 1.14.0-0ubuntu1, 1.14.0-0ubuntu1.1, 1.14.0-0ubuntu1.10, 1.14.0-0ubuntu1.11, 1.14.0-0ubuntu1.11+esm1, 1.14.0-0ubuntu1.11+esm2, 1.14.0-0ubuntu1.11+esm4, 1.14.0-0ubuntu1.2, 1.14.0-0ubuntu1.3, 1.14.0-0ubuntu1.4, 1.14.0-0ubuntu1.5, 1.14.0-0ubuntu1.6, 1.14.0-0ubuntu1.7, 1.14.0-0ubuntu1.9, 1.16.1-0ubuntu2, 1.16.1-0ubuntu3, 1.17.10-0ubuntu1, 1.17.5-0ubuntu1, 1.17.6-0ubuntu1, 1.17.7-0ubuntu1, 1.17.8-0ubuntu1, 1.17.8-0ubuntu2, 1.17.8-0ubuntu3, 1.17.9-0ubuntu1, 1.17.9-0ubuntu2, 1.17.9-0ubuntu3, 1.18.0-0ubuntu1, 1.18.0-0ubuntu1.2, 1.18.0-0ubuntu1.3, 1.18.0-0ubuntu1.4, 1.18.0-0ubuntu1.5, 1.18.0-0ubuntu1.6, 1.18.0-0ubuntu1.7, 1.18.0-0ubuntu1.7+esm1, 1.18.0-0ubuntu1.7+esm3, 1.18.0-6ubuntu11, 1.18.0-6ubuntu12, 1.18.0-6ubuntu14, 1.18.0-6ubuntu14.1, 1.18.0-6ubuntu14.10, 1.18.0-6ubuntu14.11, 1.18.0-6ubuntu14.12, 1.18.0-6ubuntu14.13, 1.18.0-6ubuntu14.14, 1.18.0-6ubuntu14.15, 1.18.0-6ubuntu14.16, 1.18.0-6ubuntu14.17, 1.18.0-6ubuntu14.18, 1.18.0-6ubuntu14.19, 1.18.0-6ubuntu14.2, 1.18.0-6ubuntu14.20, 1.18.0-6ubuntu14.21, 1.18.0-6ubuntu14.3, 1.18.0-6ubuntu14.4, 1.18.0-6ubuntu14.5, 1.18.0-6ubuntu14.6, 1.18.0-6ubuntu14.7, 1.18.0-6ubuntu14.8, 1.24.0-1ubuntu1, 1.24.0-2ubuntu1, 1.24.0-2ubuntu2, 1.24.0-2ubuntu3, 1.24.0-2ubuntu4, 1.24.0-2ubuntu6, 1.24.0-2ubuntu7, 1.24.0-2ubuntu7.1, 1.24.0-2ubuntu7.10, 1.24.0-2ubuntu7.11, 1.24.0-2ubuntu7.12, 1.24.0-2ubuntu7.13, 1.24.0-2ubuntu7.14, 1.24.0-2ubuntu7.15, 1.24.0-2ubuntu7.16, 1.24.0-2ubuntu7.17, 1.24.0-2ubuntu7.18, 1.24.0-2ubuntu7.3, 1.24.0-2ubuntu7.4, 1.24.0-2ubuntu7.5, 1.24.0-2ubuntu7.6, 1.24.0-2ubuntu7.7, 1.24.0-2ubuntu7.8, 1.24.0-2ubuntu7.9, 1.28.0-6ubuntu1, 1.28.1-2ubuntu1, 1.28.1-3ubuntu1, 1.28.2-2ubuntu1, 1.28.3-2ubuntu1, 1.28.3-2ubuntu1.1, 1.28.3-2ubuntu1.10, 1.28.3-2ubuntu1.11, 1.28.3-2ubuntu1.2, 1.28.3-2ubuntu1.3, 1.28.3-2ubuntu1.4, 1.28.3-2ubuntu1.5, 1.28.3-2ubuntu1.6, 1.28.3-2ubuntu1.7, 1.28.3-2ubuntu1.8, 1.28.3-2ubuntu1.9, 1.30.1-4ubuntu1, 1.30.1-6ubuntu1, 1.30.4-5ubuntu1, 1.30.4-7ubuntu1, 1.4.1-3ubuntu1, 1.4.3-2ubuntu1, 1.4.4-1ubuntu1, 1.4.4-2ubuntu1, 1.4.4-4ubuntu1, 1.4.5-1ubuntu1, 1.4.6-1ubuntu2, 1.4.6-1ubuntu3, 1.4.6-1ubuntu3.1, 1.4.6-1ubuntu3.2, 1.4.6-1ubuntu3.3, 1.4.6-1ubuntu3.4, 1.4.6-1ubuntu3.5, 1.4.6-1ubuntu3.6, 1.4.6-1ubuntu3.7, 1.4.6-1ubuntu3.8, 1.4.6-1ubuntu3.9, 1.4.6-1ubuntu3.9+esm1, 1.4.6-1ubuntu3.9+esm2, 1.4.6-1ubuntu3.9+esm3, 1.4.6-1ubuntu3.9+esm4, 1.4.6-1ubuntu3.9+esm5, 1.4.6-1ubuntu3.9+esm6, 1.4.6-1ubuntu3.9+esm8, 1.9.10-0ubuntu1, 1.9.10-1ubuntu1, 1.9.11-0ubuntu1, 1.9.11-0ubuntu2, 1.9.12-0ubuntu1, 1.9.13-0ubuntu1, 1.9.14-0ubuntu1, 1.9.15-0ubuntu1, 1.9.3-1ubuntu1, 1.9.6-2ubuntu1, 1.9.6-2ubuntu2, 1.9.9-0ubuntu1, 1.9.9-1ubuntu1
- Fixed versions
- 1.18.0-6ubuntu14.22, 1.24.0-2ubuntu7.19, 1.28.3-2ubuntu1.12, 1.30.4-7ubuntu1.1
- CVEs
- CVE-2026-93479
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 16:51 UTC · Revision 1
Source evidence
A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and the root directive or access log format references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or to possibly trigger a code execution. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
osv:UBUNTU-CVE-2026-93479
nginx
Fixed versions: Not specified
nginx
Fixed versions: Not specified
nginx
Fixed versions: Not specified
nginx
Fixed versions: Not specified
nginx
Fixed versions: 1.18.0-6ubuntu14.22
nginx
Fixed versions: 1.24.0-2ubuntu7.19
nginx
Fixed versions: 1.30.4-7ubuntu1.1
nginx
Fixed versions: 1.28.3-2ubuntu1.12
Complete source record
{
"id": "b2c113daec37255ded7666fcebe7e87e8ee1c7b5de83a3a4054f0e20e28d9bd9",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-93479",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-93479",
"summary": "A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and the root directive or access log format references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or to possibly trigger a code execution. There is no control plane exposure; this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
"evidence": "osv:UBUNTU-CVE-2026-93479",
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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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{
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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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{
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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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"evidence": "/affected/4/versions"
},
{
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"evidence": "/affected/4/versions"
},
{
"value": "1.18.0-6ubuntu14.16",
"evidence": "/affected/4/versions"
},
{
"value": "1.18.0-6ubuntu14.17",
"evidence": "/affected/4/versions"
},
{
"value": "1.18.0-6ubuntu14.18",
"evidence": "/affected/4/versions"
},
{
"value": "1.18.0-6ubuntu14.19",
"evidence": "/affected/4/versions"
},
{
"value": "1.18.0-6ubuntu14.20",
"evidence": "/affected/4/versions"
},
{
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"evidence": "/affected/4/versions"
}
]
},
{
"name": {
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},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/5/ranges"
}
],
"affected_versions": [
{
"value": "1.24.0-1ubuntu1",
"evidence": "/affected/5/versions"
},
{
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"evidence": "/affected/5/versions"
},
{
"value": "1.24.0-2ubuntu2",
"evidence": "/affected/5/versions"
},
{
"value": "1.24.0-2ubuntu3",
"evidence": "/affected/5/versions"
},
{
"value": "1.24.0-2ubuntu4",
"evidence": "/affected/5/versions"
},
{
"value": "1.24.0-2ubuntu6",
"evidence": "/affected/5/versions"
},
{
"value": "1.24.0-2ubuntu7",
"evidence": "/affected/5/versions"
},
{
"value": "1.24.0-2ubuntu7.1",
"evidence": "/affected/5/versions"
},
{
"value": "1.24.0-2ubuntu7.3",
"evidence": "/affected/5/versions"
},
{
"value": "1.24.0-2ubuntu7.4",
"evidence": "/affected/5/versions"
},
{
"value": "1.24.0-2ubuntu7.5",
"evidence": "/affected/5/versions"
},
{
"value": "1.24.0-2ubuntu7.6",
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"modified": "2026-10-26T22:34:48.394961517Z",
"provider": "osv",
"upstream": [
"CVE-2026-93479"
],
"references": [
"https://ubuntu.com/security/CVE-2026-93479",
"https://www.cve.org/CVERecord?id=CVE-2026-93479",
"https://my.f5.com/manage/s/article/K000162607",
"https://ubuntu.com/security/notices/USN-8955-1"
]
},
"related_cves": [
{
"value": "CVE-2026-93479",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 458995,
"published_at": "2026-10-15T00:00:00+00:00"
}