CVE-2026-93564Io.netty/netty-codec-haproxy: netty: haproxy proxy-v2 nested-tlv grandchild bytebuf reference-count leak (incomplete fix of pr #16881)
- 7.5HighCVSS base score
- 1.1%Exploitation in 30 daysEPSS · top 35% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A flaw was found in Netty. A reference-count leak in the HAProxy PROXY-v2 message decoder allows a remote, unauthenticated attacker to send specially crafted PROXY-protocol v2 headers. This can lead to memory exhaustion, resulting in a Denial of Service (DoS) for the affected system.
Timeline
ID reserved
By redhat
Published
- 49 days later
· 49 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Awaiting Analysis | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 1.1% · top 35% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
Red Hat · Red Hat Build of Apache Camel 3.33.3.SP2
- unaffected 4.1.138.Final-redhat-00001 – < *
Red Hat · Red Hat Build of Debezium 3.6
All versions: unaffected
Red Hat · Red Hat build of Keycloak 26.4
- unaffected 26.4.17-2 – < *
Red Hat · Red Hat build of Keycloak 26.4
- unaffected 26.4-29 – < *
Red Hat · Red Hat build of Keycloak 26.4
- unaffected 26.4-30 – < *
Red Hat · Red Hat build of Keycloak 26.4.17
All versions: unaffected
Red Hat · Red Hat build of Keycloak 26.6
- unaffected 26.6.8-2 – < *
Red Hat · Red Hat build of Keycloak 26.6
- unaffected 26.6-24 – < *
Red Hat · Red Hat build of Keycloak 26.6
- unaffected 26.6-24 – < *
Red Hat · Red Hat build of Keycloak 26.6.8
All versions: unaffected
Red Hat · Red Hat build of Quarkus 3.27.5.SP2
All versions: unaffected
Red Hat · Red Hat build of Quarkus 3.33.3.SP2
All versions: unaffected
Red Hat · Red Hat AMQ Broker 7
All versions: affected
Red Hat · Red Hat build of Apache Camel 4 for Quarkus 3
All versions: affected
Red Hat · Red Hat build of Apache Camel for Spring Boot 4
All versions: affected
Red Hat · Red Hat build of Apicurio Registry 3
All versions: affected
All versions: affected
Red Hat · Red Hat JBoss Enterprise Application Platform 7
All versions: affected
Red Hat · Red Hat Single Sign-On 7
All versions: affected
What to do
Workaround: See https://github.com/netty/netty/security/advisories/GHSA-j58c-g352-8h4p for fixed versions and remediation guidance.
References
References10
- RHSA-2026:69440 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:69470 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:70257 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:83612 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:95759 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:95760 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:95761 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:95762 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-93564 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2536953 (opens in a new tab)issue-trackingx_refsource_REDHAT
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-82930 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-93564)Record last updated .