Bug 2535554 (CVE-2026-85732)

Summary: CVE-2026-85732 github.com/oras-project/oras-go: oras-go: Blind Server-Side Request Forgery via unvalidated Link header URL
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in oras-go, a Go library for managing OCI artifacts. This vulnerability allows a remote attacker to perform blind Server-Side Request Forgery (SSRF) against internal services by providing a specially crafted Link header URL during pagination operations. Although the response body is not returned, an attacker can infer service reachability through timing differences and potentially obtain credentials. Exploitation requires a victim to perform a pagination-based listing operation against a malicious registry.
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Bug Depends On: 2535578    
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Description OSIDB Bzimport 2026-09-16 16:44:48 UTC 
oras-go is a Go library for managing OCI artifacts. Prior to 2.6.2, the parseLink function in registry/remote/utils.go accepts an absolute URL from a registry-controlled Link response header without validating its scheme, host, or port. Tags, Referrers, and Repositories pagination operations then issue a GET request to the attacker-selected URL from the victim's network, allowing blind server-side request forgery against internal services. The response body is not returned to the attacker, but timing and error differences can reveal service reachability, and credentials may be attached when the credential store has an entry for the target host. Exploitation requires a victim to perform a pagination-based listing operation against a malicious registry. The maintainer identifies this report as a duplicate of GHSA-3hr5-mjrr-hfjh and states that remediation is consolidated in that earlier advisory. The consolidated issue is fixed in version 2.6.2.