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CVE-2026-47774: Envoy is an open source edge and service proxy designed for cloud-native applications

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HIGH 7.5REMOTEWATCHLISTUPGRADEUPGRADE

CVE-2026-47774 is a high-severity flaw (CVSS 7.5) affecting envoy, openshift service mesh. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 b

Why this priority

  • High severity
  • Public exploit reference
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score7.5 (High)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance1.0% (top 38%)
CISA exploited listNo
WeaknessCWE-405, CWE-770, CWE-409
Published2026-06-17
Last modified2026-10-26
Publisher (CNA): GitHub, Inc. · Vendor: envoyproxy · redhat

Share: LinkedIn · X · Reddit

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

envoyproxy envoy UPGRADE
Affected: < 1.35.11 · >= 1.36.0 and < 1.36.7 · >= 1.37.0 and < 1.37.3 · 1.38.0
Fixed in: 1.35.11, 1.36.7, 1.37.3
Safe to downgrade to: a release before 1.36.0
1. Check installed version
apt-cache policy envoy || rpm -q envoy || envoy --version
2. UPGRADE to 1.35.11 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade envoy
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade envoy
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 1.36.0 (Debian / Ubuntu)
apt-cache madison envoy sudo apt install envoy=<VERSION_BEFORE_1.36.0> sudo apt-mark hold envoy
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list envoy sudo dnf downgrade envoy-<VERSION_BEFORE_1.36.0> sudo dnf versionlock add envoy
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
redhat openshift service mesh UPGRADE
Affected: >= 2.6 and < 2.6.17 · >= 3.0 and < 3.0.12 · >= 3.1 and < 3.1.9 · >= 3.2 and < 3.2.6 · >= 3.3 and < 3.3.4
Fixed in: 2.6.17, 3.0.12, 3.1.9, 3.2.6, 3.3.4
Safe to downgrade to: a release before 2.6
1. Check installed version
apt-cache policy openshift-service-mesh || rpm -q openshift-service-mesh || openshift-service-mesh --version
2. UPGRADE to 2.6.17 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade openshift-service-mesh
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade openshift-service-mesh
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 2.6 (Debian / Ubuntu)
apt-cache madison openshift-service-mesh sudo apt install openshift-service-mesh=<VERSION_BEFORE_2.6> sudo apt-mark hold openshift-service-mesh
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list openshift-service-mesh sudo dnf downgrade openshift-service-mesh-<VERSION_BEFORE_2.6> sudo dnf versionlock add openshift-service-mesh
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Fedora 46 · flare-im · FIXED · 0.22.7-1.fc46 · FEDORA-2026-cd5e8062a1 · source
sudo dnf upgrade --advisory=FEDORA-2026-cd5e8062a1
Fedora ELN · libdnf · FIXED · 0.76.0-2.eln159 · FEDORA-2026-dbd263e9d4 · source
sudo dnf upgrade --advisory=FEDORA-2026-dbd263e9d4
Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-1893 · source
sudo dnf update --advisory=ALAS2023-2026-1893
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47774?

envoy: upgrade to 1.35.11, 1.36.7, 1.37.3; openshift service mesh: upgrade to 2.6.17, 3.0.12, 3.1.9, 3.2.6, 3.3.4. Exact commands for each OS are on this page.

Is CVE-2026-47774 being exploited?

CVE-2026-47774 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47774 affect?

CVE-2026-47774 affects envoy, openshift service mesh. Severity is high (CVSS 7.5). 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 c

How urgent is CVE-2026-47774?

Priority 57/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Envoy vulnerabilities · Red Hat OpenShift vulnerabilities

Related CVEs

References

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