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Back to active CVEs
Medium · CVSS 6.9CVE-2026-89315

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

Answer in brief

CVE-2026-89315 records a Medium severity (CVSS 6.9) vulnerability in JwtClaims.MarshalJSON panics via reflect.StructOf when any untyped claim key is not a valid Go identifier suffix. The current sources do not mark it as known exploited. The current feed maps Eclipse Foundation/Eclipse KeyPont - GOSE (generic), Eclipse Foundation/Eclipse KeyPont - GOSE (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 23, 2026Updated Oct 23, 2026Source checked Oct 23, 2026First seen by HOL Oct 23, 2026Material review Oct 23, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.9
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Eclipse Foundation/Eclipse KeyPont - GOSE (generic), Eclipse Foundation/Eclipse KeyPont - GOSE (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Eclipse Foundation/Eclipse KeyPont - GOSEgeneric>=0.7.3 <=0.13.0-rc1Not reported
Eclipse Foundation/Eclipse KeyPont - GOSEgeneric>=0 <1.0.0-rc41.0.0-rc4

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Eclipse Foundation/Eclipse KeyPont - GOSE, Eclipse Foundation/Eclipse KeyPont - GOSE.
  2. 2Review the reported fix. Update Eclipse Foundation/Eclipse KeyPont - GOSE to 1.0.0-rc4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 23, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • AesGcmCryptor.Open passes attacker-controlled nonce to cipher.AEAD.Open without length check, causing panic on wrong-size IVSame eclipse foundation/eclipse keypont - gose package
  • JwksTrustStore.Get returns the last fetched JWKS key (err=nil) when the requested kid is absent, instead of nilSame eclipse foundation/eclipse keypont - gose package
  • Quadratic-time key_ops duplicate check lets a sub-1 MB JWKS body pin a CPU core for ~15 sSame eclipse foundation/eclipse keypont - gose package
  • LoadPublicKey panics on kty/alg mismatch (kty=EC with a non-EC alg) via unchecked *ECDSAOptions type assertionSame eclipse foundation/eclipse keypont - gose package
  • JwtVerifierImpl.Verify does not enforce the JWS `crit` header (RFC 7515 §4.1.11)Same eclipse foundation/eclipse keypont - gose package
  • JweRsaKeyEncryptionDecryptorImpl.Decrypt panics on attacker-chosen IV length (stdlib GCM.Open reached without nonce-size check)Same eclipse foundation/eclipse keypont - gose package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-248
Source
CVE List V5
Source checked
Oct 23, 2026
References
1 linked source
Open source record