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CVE-2026-89313— JwksTrustStore.Get returns the last fetched JWKS key (err=nil) when the requested kid is absent, instead of nil

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.

在刷新 JWKS 缓存时，将每个解析后的密钥赋值给函数的命名返回值。当请求的 不存在时，末尾的裸 语句会将 JWKS 文档中的最后一个密钥连同 错误一起返回给调用方——这导致返回了一个看似正确实则错误的结果，而非应有的“未找到”响应。

CVSS 6.3 · Medium EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Eclipse Foundation Eclipse KeyPont - GOSE 0.7.5≤ 0.13.0-rc1 affected
< 1.0.0-rc4 affected
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I. Basic Information for CVE-2026-89313

Vulnerability Information
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Vulnerability Title
JwksTrustStore.Get returns the last fetched JWKS key (err=nil) when the requested kid is absent, instead of nil
Source: CVE Program / CVE List V5
Vulnerability Description
`JwksTrustStore.Get` assigned each parsed key to the function's **named return value** while refreshing the JWKS cache. When the requested `kid` was not present, the trailing naked `return` handed the caller the last key in the JWKS document together with a `nil` error — a confidently wrong answer instead of "not found".
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不正确的解析名称或索引
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eclipse Foundation Eclipse KeyPont - GOSE 0.7.5 ~ 0.13.0-rc1 -
Eclipse Foundation Eclipse KeyPont - GOSE 0 ~ 1.0.0-rc4 -

II. Public POCs for CVE-2026-89313

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III. Intelligence Information for CVE-2026-89313

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Vendor Advisories for CVE-2026-89313 (1)

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

CVE-2026-89320 8.8 HIGH HmacShaCryptor.Hash never hashes its input — returns constant HMAC_K("") for all inputs, v
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-2026-89319 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-706

V. Comments for CVE-2026-89313

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