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CVE-2026-89315— JwtClaims.MarshalJSON panics via reflect.StructOf when any untyped claim key is not a valid Go identifier suffix

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.

在运行时使用 构建了一个 Go 结构体，为每个未指定类型的声明（claim）合成一个名为 的字段。当字段名不是有效的 Go 标识符，或与已有字段重复时， 会触发 panic。这两种情况均可通过普通的 JWT 声明名称触发。

CVSS 6.9 · Medium EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-89315

Vulnerability Information
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Vulnerability Title
JwtClaims.MarshalJSON panics via reflect.StructOf when any untyped claim key is not a valid Go identifier suffix
Source: CVE Program / CVE List V5
Vulnerability Description
`JwtClaims.MarshalJSON` built a Go struct at runtime with `reflect.StructOf`, synthesising a field named `"A" + claimName` for each untyped claim. `reflect.StructOf` **panics** when a field name is not a valid Go identifier, or when it duplicates another field. Both conditions are reachable from ordinary JWT claim names.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Eclipse Foundation Eclipse KeyPont - GOSE 0.7.3 ~ 0.13.0-rc1 -
Eclipse Foundation Eclipse KeyPont - GOSE 0 ~ 1.0.0-rc4 -

II. Public POCs for CVE-2026-89315

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III. Intelligence Information for CVE-2026-89315

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Vendor Advisories for CVE-2026-89315 (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-2026-89313 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-248

V. Comments for CVE-2026-89315

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