CVE-2026-32811: Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service

This week

HIGH 8.2REMOTEUPGRADE

CVE-2026-32811 is a high-severity flaw (CVSS 8.2) affecting heimdall. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. When using Heimdall in envoy gRPC decision API mode with versions 0.7.0-alpha through 0.17.10, wrong encoding of the query URL string allows rules with non-wildcard path expressions to be bypassed. Envoy splits the requested URL into parts, and sends the parts individually to Heimdall. Although query and path are present in the API, the query field is documented

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-116, CWE-863
Published	2026-03-20
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: dadrus

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-20 02:16 UTCPublished CVE record published
2026-06-17 10:36 UTCUpdated Record last modified

dadrus heimdall UPGRADE

Affected: >= 0.7.0 and < 0.17.11

Fixed in: 0.17.11

Safe to downgrade to: a release before 0.7.0

1. Check installed version

apt-cache policy heimdall || rpm -q heimdall || heimdall --version

2. UPGRADE to 0.17.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade heimdall

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade heimdall

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 0.7.0 (Debian / Ubuntu)

apt-cache madison heimdall sudo apt install heimdall=<VERSION_BEFORE_0.7.0> sudo apt-mark hold heimdall

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list heimdall sudo dnf downgrade heimdall-<VERSION_BEFORE_0.7.0> sudo dnf versionlock add heimdall

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-2026-32811?

heimdall: upgrade to 0.17.11. Exact commands for each OS are on this page.

Is CVE-2026-32811 being exploited?

CVE-2026-32811 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-2026-32811 affect?

CVE-2026-32811 affects heimdall. Severity is high (CVSS 8.2). Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. When using Heimdall in envoy gRPC decision API mode with versions 0.7.0-alpha through 0.17.10, wrong encoding of the query URL string allows rules with non

How urgent is CVE-2026-32811?

Priority 45/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Envoy vulnerabilities

References

← Back to latest CVEs