x402 @x402/extensions 2.3.1 through 2.28.0 SIWX Payment Bypass via PaymentPayload.resource
The x402 SIWX server extension in @x402/extensions 2.3.1 through 2.28.0, x402 PyPI 2.11.0 through 2.25.0, and Go module 2.16.0 through 2.28.0 contains an authorization bypass vulnerability that allows paying clients to unlock unpaid routes by supplying a mismatched PaymentPayload.resource URL. Attackers can pay for the cheapest SIWX-protected route while setting resource.url to an expensive route, then repeatedly access it using only a SIGN-IN-WITH-X header without further payment.
CVE-2026-113603
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-113603
@x402/extensions
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
x402
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
github.com/x402-foundation/x402/go/v2
Source reference: /containers/cna/affected/2/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/x402-foundation/x402",
"vendor": "x402-foundation",
"product": "@x402/extensions",
"versions": [
{
"status": "affected",
"version": "2.3.1",
"versionType": "semver",
"lessThanOrEqual": "2.28.0"
}
],
"packageURL": "pkg:npm/%40x402/extensions",
"defaultStatus": "unaffected"
},
{
"repo": "https://github.com/x402-foundation/x402",
"vendor": "x402-foundation",
"product": "x402",
"versions": [
{
"status": "affected",
"version": "2.11.0",
"versionType": "semver",
"lessThanOrEqual": "2.25.0"
}
],
"packageURL": "pkg:pypi/x402",
"defaultStatus": "unaffected"
},
{
"repo": "https://github.com/x402-foundation/x402",
"vendor": "x402-foundation",
"product": "github.com/x402-foundation/x402/go/v2",
"versions": [
{
"status": "affected",
"version": "2.16.0",
"versionType": "semver",
"lessThanOrEqual": "2.28.0"
}
],
"packageURL": "pkg:golang/github.com/x402-foundation/x402/go/v2",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-113603
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #49208 · Revision 1
- Added to Heist Feed
- Publisher date