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CVE-2026-47775: Envoy is an open source edge and service proxy designed for cloud-native applications

32
Routine
MEDIUM 6.8UPGRADE

CVE-2026-47775 is a medium-severity flaw (CVSS 6.8) affecting envoy. 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 1.35.11, 1.36.7, 1.37.3, and 1.38.1, the OAuth2 HTTP filter's encrypt()/decrypt() functions use AES-256-CBC without an authentication tag (no HMAC, no AEAD). The /callback endpoint returns HTTP 302 on successful decryption and HTTP 401 on padding failure, creating a padding oracle. An attacker who obtains the encrypted CodeVerifier cookie can recover t

Why this priority

  • Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score6.8 (Medium)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededNone
User interactionRequired
EPSS exploit chance0.2% (top 88%)
CISA exploited listNo
WeaknessCWE-209, CWE-327
Published2026-06-26
Last modified2026-10-25
Publisher (CNA): GitHub, Inc. · Vendor: envoyproxy

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Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

envoyproxy envoy UPGRADE
Affected: >= 1.35.0 and < 1.35.11 · >= 1.36.0 and < 1.36.7 · >= 1.37.0 and < 1.37.3 · >= 1.38.0 and < 1.38.1
Fixed in: 1.35.11, 1.36.7, 1.37.3, 1.38.1
Safe to downgrade to: a release before 1.35.0
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 1.35.0 (Debian / Ubuntu)
apt-cache madison envoy sudo apt install envoy=<VERSION_BEFORE_1.35.0> 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_1.35.0> 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.
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-2026-47775?

envoy: upgrade to 1.35.11, 1.36.7, 1.37.3, 1.38.1. Exact commands for each OS are on this page.

Is CVE-2026-47775 being exploited?

CVE-2026-47775 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-2026-47775 affect?

CVE-2026-47775 affects envoy. Severity is medium (CVSS 6.8). Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, the OAuth2 HTTP filter's encrypt()/decrypt() functions use AES-256-CBC without an authentication tag (no HM

How urgent is CVE-2026-47775?

Priority 32/100. Public exploit reference

Software pages

Envoy vulnerabilities

Related CVEs

References

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