EUVD-2026-82930
GHSA-74qm-9qc5-ff4g
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Remote unauthenticated crafted PROXY-v2 frames trigger a memory leak with no auth or interaction, yielding availability-only impact (A:H) and no confidentiality/integrity loss.
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
5DescriptionCVE.org
HAProxy PROXY-v2 nested-TLV grandchild ByteBuf reference-count leak (incomplete fix of PR #16881)
Articles & Coverage 1
AnalysisAI
Remote unauthenticated attackers can exhaust memory in Netty-based services that parse PROXY protocol v2, due to a reference-count leak in the handling of nested TLVs within HAProxyMessageDecoder, leading to denial of service. The flaw is an incomplete fix of upstream PR #16881, so partially patched deployments may remain vulnerable through the grandchild-TLV code path. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the target to be a Netty-based service that actively accepts and parses the PROXY protocol v2 - i.e., a listener configured with Netty's HAProxyMessageDecoder, typically because the app sits behind a load balancer/proxy that prepends PROXY headers. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine but not top-tier availability issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch has been identified at time of analysis; the previously issued fix (upstream PR #16881) is incomplete and does not fully mitigate the nested-TLV grandchild reference-count leak. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Netty-based services, especially JBoss EAP 7, Keycloak, and Quarkus, to determine which parse PROXY protocol v2 and are network-exposed; restrict access to trusted proxies or load balancers and enable memory monitoring and alerting. …
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External POC / Exploit Code
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