High severity · published Aug 11, 2026
CVE-2026-73247
Kestra: SSRF via Pebble http() function allows unauthenticated access to internal services & cloud metadata
8.6
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
kestra · kestra-io
< 2.0.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-73247
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-73247
github.com
https://github.com/kestra-io/kestra/security/advisories/GHSA-r56g-q4p6-m3p6
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