CVE-2026-93563 (GCVE-0-2026-93563)
Vulnerability from cvelistv5 – Published: 2026-09-18 10:58 – Updated: 2026-09-18 13:32
VLAI
EPSS
VEX
Title
Io.netty/netty-codec-smtp: netty: unbounded multi-line response accumulation in smtpresponsedecoder leads to memory-exhaustion dos
Summary
Unbounded multi-line response accumulation in SmtpResponseDecoder leads to memory-exhaustion DoS
Severity
7.5 (High)
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://access.redhat.com/security/cve/CVE-2026-93563 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2536976 | issue-trackingx_refsource_REDHAT |
Impacted products
4 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Red Hat | Red Hat build of Apache Camel for Spring Boot 4 |
cpe:/a:redhat:camel_spring_boot:4
|
||
| Red Hat | Red Hat Fuse 7 |
cpe:/a:redhat:jboss_fuse:7
|
||
| Red Hat | Red Hat JBoss Enterprise Application Platform 7 |
cpe:/a:redhat:jboss_enterprise_application_platform:7
|
||
| Red Hat | Red Hat Single Sign-On 7 |
cpe:/a:redhat:red_hat_single_sign_on:7
|
Date Public
2026-09-10 00:46
{
"containers": {
"cna": {
"affected": [
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:camel_spring_boot:4"
],
"defaultStatus": "affected",
"packageName": "netty-codec-smtp",
"product": "Red Hat build of Apache Camel for Spring Boot 4",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_fuse:7"
],
"defaultStatus": "affected",
"packageName": "netty-codec-smtp",
"product": "Red Hat Fuse 7",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
],
"defaultStatus": "affected",
"packageName": "jboss-eap-7/eap74-els-openjdk11-openshift-rhel8",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
],
"defaultStatus": "affected",
"packageName": "jboss-eap-7/eap74-els-openjdk17-openshift-rhel8",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
],
"defaultStatus": "affected",
"packageName": "jboss-eap-7/eap74-els-openjdk8-openshift-rhel8",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
],
"defaultStatus": "affected",
"packageName": "netty-codec-smtp",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:red_hat_single_sign_on:7"
],
"defaultStatus": "affected",
"packageName": "netty-codec-smtp",
"product": "Red Hat Single Sign-On 7",
"vendor": "Red Hat"
}
],
"datePublic": "2026-09-10T00:46:23.000Z",
"descriptions": [
{
"lang": "en",
"value": "Unbounded multi-line response accumulation in SmtpResponseDecoder leads to memory-exhaustion DoS"
}
],
"metrics": [
{
"other": {
"content": {
"namespace": "https://access.redhat.com/security/updates/classification/",
"value": "Important"
},
"type": "Red Hat severity rating"
}
},
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"format": "CVSS"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1035",
"description": "CWE-1035",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-18T13:32:22.314Z",
"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"shortName": "redhat"
},
"references": [
{
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/security/cve/CVE-2026-93563"
},
{
"name": "RHBZ#2536976",
"tags": [
"issue-tracking",
"x_refsource_REDHAT"
],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2536976"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-09-10T00:46:23.000Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-09-10T00:46:23.000Z",
"value": "Made public."
}
],
"title": "Io.netty/netty-codec-smtp: netty: unbounded multi-line response accumulation in smtpresponsedecoder leads to memory-exhaustion dos",
"workarounds": [
{
"lang": "en",
"value": "See https://github.com/netty/netty/security/advisories/GHSA-pq4x-537v-r54q for fixed versions and remediation guidance."
}
],
"x_generator": {
"engine": "cvelib 1.8.0"
},
"x_redhatCweChain": "CWE-1035"
}
},
"cveMetadata": {
"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"assignerShortName": "redhat",
"cveId": "CVE-2026-93563",
"datePublished": "2026-09-18T10:58:35.205Z",
"dateReserved": "2026-09-18T09:56:54.043Z",
"dateUpdated": "2026-09-18T13:32:22.314Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:camel_spring_boot:4"
],
"defaultStatus": "affected",
"packageName": "netty-codec-smtp",
"product": "Red Hat build of Apache Camel for Spring Boot 4",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:jboss_fuse:7"
],
"defaultStatus": "affected",
"packageName": "netty-codec-smtp",
"product": "Red Hat Fuse 7",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
],
"defaultStatus": "affected",
"packageName": "jboss-eap-7/eap74-els-openjdk11-openshift-rhel8",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
],
"defaultStatus": "affected",
"packageName": "jboss-eap-7/eap74-els-openjdk17-openshift-rhel8",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
],
"defaultStatus": "affected",
"packageName": "jboss-eap-7/eap74-els-openjdk8-openshift-rhel8",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
"cpes": [
"cpe:/a:redhat:jboss_enterprise_application_platform:7"
],
"defaultStatus": "affected",
"packageName": "netty-codec-smtp",
"product": "Red Hat JBoss Enterprise Application Platform 7",
"vendor": "Red Hat"
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
"cpe:/a:redhat:red_hat_single_sign_on:7"
],
"defaultStatus": "affected",
"packageName": "netty-codec-smtp",
"product": "Red Hat Single Sign-On 7",
"vendor": "Red Hat"
}
],
"source": "secalert@redhat.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Unbounded multi-line response accumulation in SmtpResponseDecoder leads to memory-exhaustion DoS"
}
],
"id": "CVE-2026-93563",
"lastModified": "2026-09-18T11:17:21.773",
"metrics": {},
"published": "2026-09-18T11:17:21.773",
"references": [
{
"source": "secalert@redhat.com",
"url": "https://access.redhat.com/security/cve/CVE-2026-93563"
},
{
"source": "secalert@redhat.com",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2536976"
}
],
"sourceIdentifier": "secalert@redhat.com",
"vulnStatus": "Received",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-1035"
}
],
"source": "secalert@redhat.com",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-09-18T13:32:11+00:00",
"cve": "CVE-2026-93563",
"id": "CVE-2026-93563",
"initial_release_date": "2026-09-10T00:46:23+00:00",
"product_status:known_affected": "7",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "io.netty/netty-codec-smtp: Netty: Unbounded multi-line response accumulation in SmtpResponseDecoder leads to memory-exhaustion DoS",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93563.json",
"version": "3"
}
}
}
Loading…
Loading…
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.
Loading…
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.
Loading…
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.
Loading…