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CVE-2026-89320— HmacShaCryptor.Hash never hashes its input — returns constant HMAC_K("") for all inputs, voiding CBC-HMAC JWE integrity

Quick assessment

Affected
Eclipse Foundation Eclipse KeyPont - GOSE
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

从未对输入进行哈希运算。对于任意输入，它始终返回 ，即在给定密钥下对空消息计算出的消息认证码（MAC）。因此，由 gose 生成或验证的每一个 AES-CBC-HMAC JWE 所携带的认证标签，对于同一密钥而言都是恒定的，且与消息内容无关，这完全消除了密文的完整性保护。

CVSS 8.8 · High
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I. Basic Information for CVE-2026-89320

Vulnerability Information
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Vulnerability Title
HmacShaCryptor.Hash never hashes its input — returns constant HMAC_K("") for all inputs, voiding CBC-HMAC JWE integrity
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
完整性检查值验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eclipse Foundation Eclipse KeyPont - GOSE 0.9.0 ~ 0.13.0-rc1 -
Eclipse Foundation Eclipse KeyPont - GOSE 0 ~ 1.0.0-rc1 -

II. Public POCs for CVE-2026-89320

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III. Intelligence Information for CVE-2026-89320

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Other References for CVE-2026-89320 (1)

Same Patch Batch · Eclipse Foundation · 2026-10-23 · 9 CVEs total

CVE-2026-89312 6.9 MEDIUM AesGcmCryptor.Open passes attacker-controlled nonce to cipher.AEAD.Open without length che
CVE-2026-89318 6.9 MEDIUM JweRsaKeyEncryptionDecryptorImpl.Decrypt panics on attacker-chosen IV length (stdlib GCM.O
CVE-2026-89314 6.9 MEDIUM Quadratic-time key_ops duplicate check lets a sub-1 MB JWKS body pin a CPU core for ~15 s
CVE-2026-89315 6.9 MEDIUM JwtClaims.MarshalJSON panics via reflect.StructOf when any untyped claim key is not a vali
CVE-2026-89313 6.3 MEDIUM JwksTrustStore.Get returns the last fetched JWKS key (err=nil) when the requested kid is a
CVE-2026-89319 6.3 MEDIUM JweDirectDecryptorBlock.Decrypt: unchecked _thales_aad length header reachable with forged
CVE-2026-89316 6.3 MEDIUM LoadPublicKey panics on kty/alg mismatch (kty=EC with a non-EC alg) via unchecked *ECDSAOp
CVE-2026-89317 6.3 MEDIUM JwtVerifierImpl.Verify does not enforce the JWS `crit` header (RFC 7515 §4.1.11)

IV. Related Vulnerabilities

Same product: Eclipse KeyPont - GOSE
Same vendor: Eclipse Foundation
Same weakness: CWE-354

V. Comments for CVE-2026-89320

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