CVE-2026-5530Network attack vector

SSRF via unrestricted cross-host blob redirects

Published Apr 5, 2026 · Updated Apr 5, 2026

SSRF in Ollama Model Pull API 0.18.0 through 0.18.1 allows remote authenticated users to make server-side requests via model pulls. In server/download.go, blob preparation accepts a cross-host redirect as the direct download URL, and downloadChunk passes it to Go's default client without a host restriction. An API caller must select an attacker-controlled registry; the server then issues ranged GET requests to the redirected endpoint, without demonstrated response disclosure.

CVSS severity5.3
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Ollama Model Pull API 0.18.0 through 0.18.1 allows remote authenticated users to make server-side requests via model pulls. In server/download.go, blob preparation accepts a cross-host redirect as the direct download URL, and downloadChunk passes it to Go's default client without a host restriction. An API caller must select an attacker-controlled registry; the server then issues ranged GET requests to the redirected endpoint, without demonstrated response disclosure.

The record

CVE
CVE-2026-5530
Published
Apr 5, 2026
Updated
Apr 5, 2026
Vendor
Ollama
Product
Ollama
Classifications
CWE-918, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=18.0
  2. Affected versionversion=18.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Ollama · Ollamaversion=18.0; version=18.1

Published CVSS scores

6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
5.3VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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