oras-go blob upload vulnerable to credential forwarding via unvalidated Location header
Exact source revision recorded 24 Oct 2026 13:19:41 UTC. It does not establish the source's current position. Latest evidence.
osv · GHSA-jxpm-75mh-9fp7
Published## Summary oras-go follows a registry-controlled `Location` header during the monolithic blob upload flow and reuses the `Authorization` header from the initial `POST` request for the subsequent `PUT` request. If a malicious registry returns a cross-host `Location`, oras-go can send the caller's credentials to an attacker-controlled endpoint. ## Affected Versions tested: v2.6.0 (commit 03243809936cce826494b5506f724c6dc11115b1, as-of 2026-01-24) range: unknown; likely affects earlier v2.x releases that include the same upload flow ## Impact Credential leak to an attacker-controlled endpoint and client-side ssrf to a cross-host target. ## Affected Component - `registry/remote/repository.go:878-916` (`blobStore.completePushAfterInitialPost`) ## Reproduction Attachments include `poc.zip` with a local-only harness (no real registry required). It runs a fake registry server that returns a cross-host `Location` and a second server that records whether it received `Authorization`. ```bash unzip -q -o poc.zip -d /tmp/poc cd /tmp/poc/poc-F-ORAS-LOCATION-UPLOAD-001 make canonical make control ``` ## Recommended Fix - validate `Location` before uploading (scheme + hostname + effective port) against the original request, or require an explicit opt-in allowlist for cross-host upload urls - never forward `Authorization` when the upload target changes host or scheme ## references - security policy: https://github.com/oras-project/oras-go/security/policy - vulnerable code: `registry/remote/repository.go` (see `blobStore.completePushAfterInitialPost`)
- Source published
- 1 Jul 2026 21:35:45 UTC
- Source modified
- 10 Sep 2026 03:50:52 UTC
- Observed here
- 24 Oct 2026 13:19:41 UTC
- Source terms
- GitHub Advisory Database · CC-BY-4.0
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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.
CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Publisher rating · HIGH