CVE-2026-97629 (GCVE-0-2026-97629)
Vulnerability from cvelistv5 – Published: 2026-10-14 14:40 – Updated: 2026-10-15 16:43
VLAI
EPSS
VEX
Title
NGINX ngx_http_ssl_module vulnerability
Summary
Description
When NGINX Plus or NGINX Open Source is configured with ssl_session_cache
shared:name:size
without an explicit ssl_session_ticket_key file directives to automatically rotate SSL session ticket keys, a remote unauthenticated attacker is able to forge client SSL sessions
in a non-deterministic manner that is beyond the attacker's control. An attacker could leverage this vulnerability to bypass verification of client certificates.
Impact
This vulnerability can lead to the exposure of resources or functionality to unintended actors, possibly providing attackers with access to sensitive information. 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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 15:52 UTC
CWE
- CWE-908 - Use of Uninitialized Resource
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://my.f5.com/manage/s/article/K000162606 | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| F5 | NGINX Plus |
Affected:
37.1.0 , < 37.1.0.1
(custom)
Affected: 37.0.0 , < 37.0.5.1 (custom) Affected: R36 , < * (custom) Affected: R35 , < * (custom) Affected: R34 , < * (custom) Affected: R33 , < * (custom) |
guessed | |
| F5 | NGINX Open Source |
Affected:
1.31.0 , < 1.31.7
(custom)
Affected: 1.30.0 , < 1.30.6 (custom) Affected: 1.23.3 , < * (custom) |
guessed |
Date Public
2026-10-14 14:00
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"lang": "en",
"value": "GENERAL"
}
]
},
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 8.3,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-908",
"description": "CWE-908 Use of Uninitialized Resource",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-14T14:40:26.740Z",
"orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
"shortName": "f5"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://my.f5.com/manage/s/article/K000162606"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "NGINX ngx_http_ssl_module vulnerability",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eDo not enable automatic rotation of SSL session ticket keys: \u003cbr\u003e\u003cbr\u003eoption a) remove the \"ssl_session_cache \u003c/span\u003e\u003cb\u003eshared\u003c/b\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e:name:size\" directive;\u003cbr\u003e\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache\"\u003ehttps://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache\u003c/a\u003e \u003cbr\u003e\u003cbr\u003eoption b) switch to loading static ticket keys from a file using the \"ssl_session_ticket_key\" directive.\u003cbr\u003e\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_ticket_key\"\u003ehttps://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_ticket_key\u003c/a\u003e \u003cbr\u003e\u003cbr\u003eSystems that disable session tickets (\"ssl_session_tickets off;\") are not affected.\u003cbr\u003e\u003ca target=\"_blank\" rel=\"nofollow\" href=\"https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_tickets\"\u003ehttps://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_tickets\u003c/a\u003e\u003c/span\u003e"
}
],
"value": "Do not enable automatic rotation of SSL session ticket keys: \n\noption a) remove the \"ssl_session_cache shared:name:size\" directive;\n https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache \n\noption b) switch to loading static ticket keys from a file using the \"ssl_session_ticket_key\" directive.\n https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_ticket_key \n\nSystems that disable session tickets (\"ssl_session_tickets off;\") are not affected.\n https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_tickets"
}
],
"x_generator": {
"engine": "F5 SIRTBot v1.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
"assignerShortName": "f5",
"cveId": "CVE-2026-97629",
"datePublished": "2026-10-14T14:40:26.740Z",
"dateReserved": "2026-09-30T17:31:09.133Z",
"dateUpdated": "2026-10-15T16:43:47.036Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.