CVE-2026-89320 Details
Description
`HmacShaCryptor.Hash` never hashed its input. For any input it returned `HMAC_K("")` — the MAC of the empty message under the key. Every AES-CBC-HMAC JWE produced or verified by gose therefore carried an authentication tag that is constant per key and independent of the message, removing ciphertext integrity entirely.
A vulnerability exists in the Eclipse KeyPont library, specifically in the HmacShaCryptor component, which improperly handles input by never hashing it. Instead, it consistently returns a fixed HMAC value for the empty message, HMAC_K(''), regardless of the actual input. This flaw was introduced in version 0.9.0 and persists through 0.13.0-rc1. As a result, any JSON Web Encryption (JWE) using AES-CBC with HMAC, processed by this library, has an authentication tag that is constant for each key and unrelated to the message content. This defect completely undermines the integrity of the ciphertext.
Users can upgrade to 'github.com/eclipse-keypont/gose' version 1.0.0-rc1 or later. Those who cannot migrate immediately should avoid the AES-CBC-HMAC direct encryption path and use the AEAD/GCM path instead, which is unaffected by this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 23, 2026CISA-ADP
Assessed Nov 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/eclipse-keypont/gose/security/advisories/GHSA-h6w5-722x-2h3m | CISA-ADP | AdvisoryRemedyVendor |
| https://github.com/eclipse-keypont/gose/security/advisories/GHSA-h6w5-722x-2h3m | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-354 | Improper Validation of Integrity Check Value | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Eclipse KeyPont gose | < 1.0.0-rc1 (semver) >= 1.0.0-rc1 (semver) |
CPE
Remediation
| |
| ThalesGroup gose | >= 0.9.0, <= 0.13.0-rc1 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 2, 2026 | CVE Modified | CISA-ADP |
| Oct 23, 2026 | New CVE Received | [email protected] |