Vulnerabilities

Vulnerability · CVE-2026-108126

temporal-proxy 0.2.0 through 0.8.0 does not bind encrypted payloads to the namespace they were encrypted for.

Published Oct 15, 2026 · catalog updated Oct 15, 2026 · temporal-proxy 0.2.0 through 0.8.0

Check if you run it

No confirmed exploitation is on record for CVE-2026-108126. EPSS is 0.36%. Act only if a listed version of temporal-proxy 0.2.0 through 0.8.0 is installed.

Severity

Medium6.0

Known exploitation

Not in CISA/VulnCheck KEV

EPSS

0.36%

Remediation

Not established

Affected products

See sources for product scope

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.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.