kestra-io Kestra up to 1.x Http Function HttpFunction.java http uri server-side request forgery

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.0$0-$5k1.16

Summaryinfo

A vulnerability categorized as critical has been discovered in kestra-io Kestra up to 1.x. This issue affects the function http of the file core/src/main/java/io/kestra/core/runners/pebble/functions/HttpFunction.java of the component Http Function. The manipulation of the argument uri results in server-side request forgery. This vulnerability was named CVE-2026-73247. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in kestra-io Kestra up to 1.x. It has been classified as critical. Affected is the function http of the file core/src/main/java/io/kestra/core/runners/pebble/functions/HttpFunction.java of the component Http Function. The manipulation of the argument uri with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Kestra is an open-source, event-driven orchestration platform. Prior to 2.0.0, Kestra's core/src/main/java/io/kestra/core/runners/pebble/functions/HttpFunction.java passes the user-controlled http() uri argument to URI.create() and the server-side HTTP client without restricting private, loopback, or link-local destinations, allowing an unauthenticated attacker to import and execute a flow that accesses internal services or cloud metadata.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-73247 since 08/11/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available.

Upgrading to version 2.0.0 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Server-side request forgery
CWE: CWE-918
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kestra 2.0.0

Timelineinfo

08/11/2026 CVE reserved
08/11/2026 +0 days VulDB entry created
08/12/2026 +0 days Advisory disclosed
08/12/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-73247 (🔒)
GCVE (CVE): GCVE-0-2026-73247
GCVE (VulDB): GCVE-100-388788

Entryinfo

Created: 08/12/2026 00:21
Changes: 08/12/2026 00:21 (58)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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