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TI-2026-80925 Aliases CVE-2026-116587GHSA-mgcc-cww5-fp2q

Denial of service in go-jose when parsing JWKs with RSA keys

Priority LOW 39CWE-407Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 5 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-407.

Summary

The go-jose library for Go is affected from 0 before 4.1.6 in the github.com/go-jose/go-jose/v4 module, and github.com/go-jose/go-jose/v3 through 3.0.5 is affected too. It parses attacker-controlled RSA modulus and prime values from JWKs without enforcing size and consistency bounds. On Go 1.24 and later, crafted large or degenerate RSA parameters make key validation consume cubic CPU time (CWE-407). A remote attacker can cause denial of service in applications that parse JWKs from untrusted sources.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Go JOSE provides an implementation of the Javascript Object Signing and Encryption set of standards in Go, including support for JSON Web Encryption (JWE), JSON Web Signature (JWS), and JSON Web Token (JWT) standards. Prior to 4.1.6, go-jose parses attacker-controlled RSA modulus and prime values from JWKs without enforcing size and consistency bounds before passing them to crypto/rsa.PrivateKey.Validate. On Go 1.24 and later, crafted large or degenerate RSA parameters can make that validation consume cubic CPU time, allowing remote denial of service in applications that parse JWKs from untrusted sources. This issue is fixed in version 4.1.6.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00366 30th percentileScored 2026-11-07
Fix Partial go-jose (go-jose): 4.1.6github.com/go-jose/go-jose/v4 (Go): 4.1.6Red Hat: 5 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
go-josego-josebefore 4.1.64.1.6Patch availableCNA
—github.com/go-jose/go-jose/v4 (Go)before 4.1.64.1.6Patch availableGHSA-mgcc-cww5-fp2q
—github.com/go-jose/go-jose/v3 (Go)up to 3.0.5—No fix listedGHSA-mgcc-cww5-fp2q
  • go-jose Vendorgo-jose Affected before 4.1.6 Fixed in 4.1.6 Patch available CNA
  • github.com/go-jose/go-jose/v4 (Go) Vendor— Affected before 4.1.6 Fixed in 4.1.6 Patch available GHSA-mgcc-cww5-fp2q
  • github.com/go-jose/go-jose/v3 (Go) Vendor— Affected up to 3.0.5 Fixed in — No fix listed GHSA-mgcc-cww5-fp2q

Remediation

Update github.com/go-jose/go-jose/v4 to version 4.1.6 or later. The sources list no fixed version for github.com/go-jose/go-jose/v3. Red Hat lists Multicluster Engine for Kubernetes, Red Hat Advanced Cluster Management for Kubernetes 2, Red Hat OpenShift AI (RHOAI) and Red Hat OpenShift Container Platform 4 as affected with no fix available, and OpenShift Service Mesh 3 with no fix planned.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA go-jose (go-jose) Fixed in 4.1.6
  • Fix · GHSA-mgcc-cww5-fp2q github.com/go-jose/go-jose/v4 (Go) Fixed in 4.1.6 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Multicluster Engine for KubernetesAffectedNo fix yet
OpenShift Service Mesh 3AffectedNo fix planned: Will not fix
Red Hat Advanced Cluster Management for Kubernetes 2AffectedNo fix yet
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet
Red Hat OpenShift Container Platform 4AffectedNo fix yet
Not affected: 2 products
  • OpenShift Service Mesh 3
  • Red Hat OpenShift Container Platform 4

Timeline

  1. 2026-10-26 Threatist record created from CVE-2026-116587
  2. 2026-10-27 CISA SSVC decision points changed
  3. 2026-10-27 Priority changed: MEDIUM → LOW
  4. 2026-10-27 Alias added: GHSA-mgcc-cww5-fp2q
  5. 2026-10-29 Affected versions changed · Red Hat
  6. 2026-10-29 CVSS score added · Red Hat
  7. 2026-11-03 Affected versions changed · Red Hat
  8. 2026-11-06 Affected versions changed · Red Hat

References

Advisory 1

Other 4

  • TI-2026-80924 Go JOSE: Panics in JSON parsing CVSS 4.0MEDIUM 6.9
  • TI-2026-80923 Panic in Go JOSE CBC-HMAC decryption enables denial of service CVSS 4.0MEDIUM 6.9
  • TI-2025-20001 Go JOSE's Parsing Vulnerable to Denial of Service CVSS 4.0MEDIUM 6.6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences