CVE catalog
CVE-2026-47774
Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.35.11, 1.36.7, 1.37.3, and 1.38.1, a vulnerability in Envoy's HTTP/2 downstream request proce
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.97% · Oct 25, 2026
A denial-of-service vulnerability was found in Envoy's HTTP/2 HPACK header compression implementation. A remote attacker could send a specially crafted HTTP/2 request that triggers disproportionately large memory allocations on the server, leading to resource exhaustion and denial of service. envoy: envoy: HTTP/2 Remote Denial of Service via HPACK compression bomb and Slowloris-style attack The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | envoy | Not reported | 1.35.11 | fixed |
| Cpe | envoy | Not reported | 1.36.7 | fixed |
| Cpe | envoy | Not reported | 1.37.3 | fixed |
| Cpe | envoy | Not reported | Not reported | unknown |
| Cpe | openshift_service_mesh | Not reported | 2.6.17 | fixed |
| Cpe | openshift_service_mesh | Not reported | 3.0.12 | fixed |
| Cpe | openshift_service_mesh | Not reported | 3.1.9 | fixed |
| Cpe | openshift_service_mesh | Not reported | 3.2.6 | fixed |
| Cpe | openshift_service_mesh | Not reported | 3.3.4 | fixed |
| Cpe | envoy | Not reported | Not reported | unknown |
| Cpe | openshift_service_mesh | Not reported | 3.3.4 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | envoy | cpe | Not reported | 1.35.11 | Not reported | Not reported | Not reported |
| Cpe | envoy | cpe | Not reported | 1.36.7 | Not reported | Not reported | Not reported |
| Cpe | envoy | cpe | Not reported | 1.37.3 | Not reported | Not reported | Not reported |
| Cpe | openshift_service_mesh | cpe | Not reported | 2.6.17 | Not reported | Not reported | Not reported |
| Cpe | openshift_service_mesh | cpe | Not reported | 3.0.12 | Not reported | Not reported | Not reported |
| Cpe | openshift_service_mesh | cpe | Not reported | 3.1.9 | Not reported | Not reported | Not reported |
| Cpe | openshift_service_mesh | cpe | Not reported | 3.2.6 | Not reported | Not reported | Not reported |
| Cpe | openshift_service_mesh | cpe | Not reported | 3.3.4 | Not reported | Not reported | Not reported |
| Cpe | openshift_service_mesh | cpe | Not reported | 3.3.4 | Not reported | NVD-CVE-2026-47774 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [http://www.openwall.com/lists/oss-security/2026/06/04/15]
- [https://access.redhat.com/errata/RHSA-2026:26210]
- [https://access.redhat.com/errata/RHSA-2026:26222]
- [https://access.redhat.com/errata/RHSA-2026:26231]
- [https://access.redhat.com/errata/RHSA-2026:26247]
- [https://access.redhat.com/errata/RHSA-2026:27114]
- [https://access.redhat.com/security/cve/CVE-2026-47774]
- [https://bugzilla.redhat.com/show_bug.cgi?id=2487465]
- [https://github.com/envoyproxy/envoy/security/advisories/GHSA-22m2-hvr2-xqc8]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-47774]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47774.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1948.json]
[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [Red Hat security advisories and VEX]