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SCA: security update for github.com/oxyno-zeta/s3-proxy (GHSA-rfgq-wgg8-662p)

critical Tenable Self-Hosted Container Security Plugin ID 441254

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - oxyno-zeta/s3-proxy is an aws s3 proxy written in go. Prior to 5.0.0, s3-proxy contains an authentication
 bypass caused by inconsistent URL path interpretation between the authentication middleware and the bucket
 handler. The authentication middleware evaluates resource path patterns against the percent-encoded
 request URI (r.URL.RequestURI()), while the bucket handler constructs S3 object keys from the decoded path
 (r.URL.Path). This mismatch, combined with the glob library being invoked without a path separator
 (causing * to match across / boundaries), allows unauthenticated attackers to write to, read from, or
 delete objects in protected S3 namespaces. Exploitation is possible via three techniques: (1) using *
 patterns that match across path separators to reach protected routes via path traversal (e.g.,
 /open/foo/drafts/../restricted/), (2) using percent-encoded slashes (%2F) to collapse multiple path
 segments into a single token at the auth layer while the decoded form resolves to a protected namespace at
 the storage layer, and (3) using dot-dot segments (../) under ** prefix patterns, where the raw path
 matches an open route while Go's URL parser resolves the traversal to a protected path before the bucket
 handler runs. An unauthenticated attacker with network access can perform unauthorized PUT, GET, or DELETE
 operations on objects in authentication-protected S3 namespaces. This vulnerability is fixed in 5.0.0.
 (CVE-2026-42882)

Solution

Update the github.com/oxyno-zeta/s3-proxy library and its related packages to version 0.0.0-20260424211602-1320e4abd46a or later.

See Also

https://github.com/advisories/GHSA-rfgq-wgg8-662p

Plugin Details

Severity: Critical

ID: 441254

Version: Revision 1.6

Type: Local

Family: SCA Checks

Published: 5/6/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: High

Score: 7.2

Percentile: 98.45

Vendor

Vendor Severity: Critical

CVSS v2

Risk Factor: High

Base Score: 9.7

Temporal Score: 7.2

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:P

CVSS Score Source: CVE-2026-42882

CVSS v3

Risk Factor: Critical

Base Score: 9.4

Temporal Score: 8.2

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/5/2026

Vulnerability Publication Date: 5/5/2026

Reference Information

CVE: CVE-2026-42882