What’s Vulnerable › Vulnerabilities

CVE-2026-23537: Feast: unauthenticated arbitrary file write

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-01 · updated 2026-07-15
• Weakness: CWE-862

Description

A vulnerability has been identified in the Feast Feature Server’s `/save-document` endpoint that allows an unauthenticated remote attacker to write arbitrary JSON files to the server's filesystem. Although the system attempts to restrict file locations, these protections can be bypassed, enabling an attacker to overwrite vital application configurations or startup scripts. Because this flaw requires no credentials or special privileges, any attacker with network access to the server can potentially compromise the integrity of the system. This could lead to unauthorized system modifications, denial of service through disk exhaustion, or potential remote code execution.

Affected products

• Feast Feature Server: before 0.59.0 — fixed in 0.59.0

How to fix

Upgrade to a fixed version: Feast Feature Server 0.59.0. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/security/cve/CVE-2026-23537
• https://bugzilla.redhat.com/show_bug.cgi?id=2429304
• https://github.com/red-hat-data-services/feast/pull/192
• https://access.redhat.com/security/cve/CVE-2026-23537
• https://bugzilla.redhat.com/show_bug.cgi?id=2429304
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23537.json

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