temporal-proxy 0.2.0 through 0.8.0 does not bind encrypted payloads to the namespace they were encrypted for. When payload encryption is enabled, the proxy chooses the decryption key by an identifier stored in the payload rather than by the namespace of the request, and nothing in the ciphertext records that namespace. A caller whom the proxy authorizes only for namespace B, and who has obtained an encrypted payload from namespace A, can therefore have the proxy decrypt it. In 0.8.0, the caller can submit the payload to the codec server's /decode endpoint. In every affected version, a caller who can also write to namespace B on the Temporal server directly can place the payload there and read it back through the proxy. This holds whether namespaces share the default key or each has its own, because a single proxy holds every key it is configured with. The issue does not give the attacker encrypted payloads they could not already obtain, and does not allow encrypted payloads to be modified.
Metrics
Affected Vendors & Products
References
History
Tue, 27 Oct 2026 04:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Temporal
Temporal temporal-proxy |
|
| Vendors & Products |
Temporal
Temporal temporal-proxy |
Fri, 16 Oct 2026 16:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Thu, 15 Oct 2026 19:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | temporal-proxy 0.2.0 through 0.8.0 does not bind encrypted payloads to the namespace they were encrypted for. When payload encryption is enabled, the proxy chooses the decryption key by an identifier stored in the payload rather than by the namespace of the request, and nothing in the ciphertext records that namespace. A caller whom the proxy authorizes only for namespace B, and who has obtained an encrypted payload from namespace A, can therefore have the proxy decrypt it. In 0.8.0, the caller can submit the payload to the codec server's /decode endpoint. In every affected version, a caller who can also write to namespace B on the Temporal server directly can place the payload there and read it back through the proxy. This holds whether namespaces share the default key or each has its own, because a single proxy holds every key it is configured with. The issue does not give the attacker encrypted payloads they could not already obtain, and does not allow encrypted payloads to be modified. | |
| Title | temporal-proxy payload decryption is not bound to the request namespace | |
| Weaknesses | CWE-639 | |
| References |
|
|
| Metrics |
cvssV4_0
|
Status: PUBLISHED
Assigner: Temporal
Published: 2026-10-15T19:09:30.743Z
Updated: 2026-10-16T15:20:20.801Z
Reserved: 2026-10-09T14:47:54.417Z
Link: CVE-2026-108126
Updated: 2026-10-16T15:11:45.651Z
Status : Awaiting Analysis
Published: 2026-10-15T19:17:19.873
Modified: 2026-10-16T19:55:59.740
Link: CVE-2026-108126
No data.