CVE-2026-49869: Kestra OSS OS Command Injection Vulnerability

Patch now

CRITICAL 10.0EXPLOITEDREMOTEUPGRADE

CVE-2026-49869 is a critical-severity flaw (CVSS 10.0) affecting kestra, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, AuthenticationFilter in Kestra OSS uses request.getPath().endsWith("/configs") to whitelist the public configuration endpoint from Basic Auth. Because the check is a suffix match rather than an exact path match, any API path whose last segment is configs bypasses authentication entirely. An unauthenticated remote attacker can exploit this to create and exec

Why this priority

Critical severity
Exploited in the wild (CISA KEV)
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	10.0 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	Yes, fix due 2026-09-05
Weakness	CWE-78, CWE-184, CWE-287, CWE-918
Published	2026-06-26
Last modified	2026-09-03

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

Am I affected?

Timeline

2026-06-26 22:16 UTCPublished CVE record published
2026-09-02Exploited Added to the CISA Known Exploited Vulnerabilities list
2026-09-03 13:05 UTCUpdated Record last modified
2026-09-05Deadline CISA due date for US federal agencies to patch

kestra kestra UPGRADE

Affected: < 1.0.45 · >= 1.1.0 and < 1.3.21

Fixed in: 1.0.45, 1.3.21

Safe to downgrade to: a release before 1.1.0

1. Check installed version

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

2. UPGRADE to 1.0.45 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kestra

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 1.1.0 (Debian / Ubuntu)

apt-cache madison kestra sudo apt install kestra=<VERSION_BEFORE_1.1.0> sudo apt-mark hold kestra

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

dnf --showduplicates list kestra sudo dnf downgrade kestra-<VERSION_BEFORE_1.1.0> sudo dnf versionlock add kestra

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 · uv · FIXED · 0.13.5-1.fc46 · FEDORA-2026-61ea5a28c6 · source

sudo dnf upgrade --advisory=FEDORA-2026-61ea5a28c6

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: EQSTLab/CVE-2026-49869 (4 stars)
GitHub PoC: Ap0dexMe0/CVE-2026-49869 (3 stars)
Write-up: github.com/kestra-io/kestra/security/advisories/GHSA-5vc5-wxxq-3fjx

Verify at the official source NVD · CVE Program · CISA KEV catalog · 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.

References

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