oras-go: Blind SSRF via unvalidated Link header URL in pagination allows internal network probing

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.7 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

EPSS

• CVE-2026-85732: 0.38% estimated exploitation activity in the next 30 days; percentile 32.53 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary oras-go's pagination helper parseLink() in registry/remote/utils.go follows the Link response header from a registry without validating the URL's host or scheme. When a malicious registry returns a Link header containing an absolute URL pointing to an arbitrary host (e.g., a cloud metadata endpoint), the client makes GET requests to that host from the victim's network. This affects all pagination-based listing operations: Tags, Referrers, and Repositories (catalog). Root Cause parseLink() at registry/remote/utils.go:54 calls resp.Request.URL.Parse(link) which, for absolute URLs, returns the absolute URL unchanged. The result is passed directly to the next pagination loop iteration where http.NewRequestWithContext() creates a GET request to the attacker-specified URL. No host comparison, scheme validation, or IP filtering exists between parseLink output and the HTTP request. Affected Code Paths - registry/remote/repository.go:Tags() calls parseLink() for next page URL -…

Published by the source

17 Sep 2026, 17:16 UTC

Last modified by the source

1 Oct 2026, 20:45 UTC

Source last checked

26 Oct 2026, 15:29 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-h7vf-4x9w-h99v

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GO-2026-6497

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-h7vf-4x9w-h99v

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# Patch Next advisory brief: CVE-2026-85732

Advisory: oras-go: Blind SSRF via unvalidated Link header URL in pagination allows internal network probing
IDs: CVE-2026-85732, GHSA-h7vf-4x9w-h99v
Record: https://patchnext.com/advisories/cve-2026-85732 (revision 3, source checked 26 Oct 2026, 15:29 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: oras.land/oras-go/v2 2.6.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go oras.land/oras-go/v2: affected <= 2.6.1; fixed in 2.6.2

## Suggested inspection (read-only)
- Go oras.land/oras-go/v2: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on oras.land/oras-go/v2.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-h7vf-4x9w-h99v (OSV record GHSA-h7vf-4x9w-h99v lists affected ranges: Go oras.land/oras-go/v2 >=0 <2.6.2 (fixed))
- Verified: https://osv.dev/vulnerability/GO-2026-6497 (OSV record GO-2026-6497 lists affected ranges: Go oras.land/oras-go/v2 >=0 <2.6.2 (fixed))
- Verified: https://github.com/advisories/GHSA-h7vf-4x9w-h99v (GitHub-reviewed advisory GHSA-h7vf-4x9w-h99v lists affected ranges: Go oras.land/oras-go/v2 >=0 <=2.6.1)

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