FKIE_CVE-2026-42945
Vulnerability from fkie_nvd - Published: 2026-05-13 16:16 - Updated: 2026-09-10 13:20
Severity
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1 (High) - CVSS:3.1/
Summary
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its 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. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| f5 | dos | * | |
| f5 | dos | 4.8.0 | |
| f5 | nginx_gateway_fabric | * | |
| f5 | nginx_gateway_fabric | * | |
| f5 | nginx_ingress_controller | * | |
| f5 | nginx_ingress_controller | * | |
| f5 | nginx_ingress_controller | * | |
| f5 | nginx_instance_manager | * | |
| f5 | nginx_open_source | * | |
| f5 | nginx_plus | * | |
| f5 | waf | * | |
| f5 | waf | * | |
| f5 | waf | * |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unknown",
"modules": [
"ngx_http_rewrite_module"
],
"product": "NGINX Plus",
"vendor": "F5",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "R37",
"versionType": "custom"
},
{
"lessThan": "R36 P4",
"status": "affected",
"version": "R36",
"versionType": "custom"
},
{
"lessThan": "R32 P6",
"status": "affected",
"version": "R32",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unaffected",
"modules": [
"ngx_http_rewrite_module"
],
"product": "NGINX Open Source",
"vendor": "F5",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "1.31.0",
"versionType": "semver"
},
{
"lessThan": "1.30.1",
"status": "affected",
"version": "0.6.27",
"versionType": "semver"
}
]
}
],
"source": "f5sirt@f5.com"
},
{
"affectedData": [
{
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"cpes": [
"cpe:/o:redhat:enterprise_linux:10.1",
"cpe:/o:redhat:enterprise_linux:10.2"
],
"defaultStatus": "affected",
"packageName": "nginx",
"product": "Red Hat Enterprise Linux 10",
"vendor": "Red Hat",
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{
"lessThan": "*",
"status": "unaffected",
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"versionType": "rpm"
},
{
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}
]
},
{
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],
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]
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{
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{
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"cpes": [
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"packageName": "nginx",
"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat",
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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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"vendor": "Red Hat",
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}
]
},
{
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],
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"product": "Red Hat Openshift Data Foundation 4.14",
"vendor": "Red Hat",
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"version": "1779972138",
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}
]
},
{
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"product": "Red Hat Openshift Data Foundation 4.14",
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]
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}
]
},
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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.
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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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