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CVE-2026-47774

HIGH · CVSS 7.5 · Analyzed

Published: 2026-06-17 · Updated: 2026-10-26 · Source: NVD

Stored catalog record

Source record retrieved 2026-10-28T10:25:43.926107+00:00. Scheduled imports handle updates; this page does not assert that the provider was queried just now.

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Vulnerability overview

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 processing allows an unauthenticated remote client to trigger excessive memory consumption, potentially resulting in OOM termination of the Envoy process and denial of service. The issue arises from the combination of two behaviors. First, cookie header bytes are not fully accounted for during request header size validation in Envoy. Second, HPACK header block limits in oghttp2/quiche are enforced on encoded bytes without a corresponding limit on total decoded header size. Together, these behaviors allow a malicious client to cause large decoded header allocations while bypassing the intended request header size protections. Versions 1.35.11, 1.36.7, 1.37.3, and 1.38.1 contain a fix. No complete workaround is known short of applying a fix. Possible temporary mitigations include disabling downstream HTTP/2 where operationally feasible; enforcing stricter request header and cookie limits before traffic reaches Envoy; and monitoring Envoy memory usage for abnormal growth under HTTP/2 traffic.

Patch review priority

Assess exposure and vendor guidance

  • No higher-priority signal is available in the current stored evidence.

FIRST EPSS: 0.97% · percentile 61.6 · score date 2026-10-27.

EPSS estimates probability of exploitation in the next 30 days. It does not measure your exposure or prove exploitation. The elevated threshold is 10%; CISA KEV takes precedence. About FIRST EPSS ↗

Severity and scoring

CVSS score
7.5 · HIGH
CVSS version
3.1
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-405, CWE-409, CWE-770

CVSS measures technical severity; it does not establish whether this vulnerability is being exploited in your environment.

Known exploitation and remediation

Not listed in the CISA catalog retrieved for this record. This does not establish that exploitation has not occurred.

Verify affected versions and patch availability in the vendor advisory before making changes.

Affected products and versions

  • cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*

    Before (exclusive): 1.35.11

  • cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*

    From (inclusive): 1.36.0

    Before (exclusive): 1.36.7

  • cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*

    From (inclusive): 1.37.0

    Before (exclusive): 1.37.3

  • cpe:2.3:a:envoyproxy:envoy:1.38.0:*:*:*:*:*:*:*

  • cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:*

    From (inclusive): 2.6

    Before (exclusive): 2.6.17

  • cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:*

    From (inclusive): 3.0

    Before (exclusive): 3.0.12

  • cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:*

    From (inclusive): 3.1

    Before (exclusive): 3.1.9

  • cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:*

    From (inclusive): 3.2

    Before (exclusive): 3.2.6

  • cpe:2.3:a:redhat:openshift_service_mesh:*:*:*:*:*:*:*:*

    From (inclusive): 3.3

    Before (exclusive): 3.3.4

These are NVD CPE applicability entries. Some products depend on configuration conditions; consult the official record to confirm applicability.

Advisories and references

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