CVE-2026-45807: Kestra is an open-source, event-driven orchestration platform

This month

HIGH 7.7UPGRADE

CVE-2026-45807 is a high-severity flaw (CVSS 7.7) affecting kestra. 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 1.0.43 and 1.3.19, several Kestra API endpoints accept a kestra:// URI from the client and pass it through StorageInterface.parentTraversalGuard before reading the underlying file from the local storage backend. The guard only inspects the literal URI.toString(), so a URL-encoded .. written as %2E%2E slips through. The downstream code then calls URI.getPath(), which decodes %

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 53%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-06-26
Last modified	2026-10-25

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

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

Am I affected?

Timeline

2026-06-26 22:16 UTCPublished CVE record published
2026-10-25 17:10 UTCUpdated Record last modified

kestra kestra UPGRADE

Affected: < 1.0.43 · >= 1.1.0 and < 1.3.19

Fixed in: 1.0.43, 1.3.19

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 1.0.43 (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.

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-2026-45807?

kestra: upgrade to 1.0.43, 1.3.19. Exact commands for each OS are on this page.

Is CVE-2026-45807 being exploited?

CVE-2026-45807 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-2026-45807 affect?

CVE-2026-45807 affects kestra. Severity is high (CVSS 7.7). Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.43 and 1.3.19, several Kestra API endpoints accept a kestra:// URI from the client and pass it through StorageInterface.parentTraversalGuard before reading the unde

How urgent is CVE-2026-45807?

Priority 44/100. High severity; Public exploit reference

Related CVEs

CVE-2026-49869 CRITICAL 10.0 EXPLOITED UPGRADE Kestra OSS OS Command Injection Vulnerability
CVE-2026-53576 CRITICAL 10.0 UPGRADE Kestra is an open-source, event-driven orchestration platform
CVE-2026-55069 HIGH 8.7 UPGRADE Kestra is an open-source, event-driven orchestration platform
CVE-2026-53577 MEDIUM 6.5 UPGRADE Kestra is an open-source, event-driven orchestration platform

References

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