Read the docs
TI-2026-80923 Aliases CVE-2026-116585GHSA-4w3g-jfj2-cw2q

Panic in Go JOSE CBC-HMAC decryption enables denial of service

Priority LOW 36CWE-129Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat.

Summary

Go JOSE versions before 4.1.5 are affected, as are github.com/go-jose/go-jose/v3 versions through 3.0.5. Decrypting untrusted JWE ciphertext with A128CBC-HS256, A192CBC-HS384, or A256CBC-HS512 can pass an empty buffer to CBC-HMAC unpadding, where improper validation of an array index (CWE-129) causes a panic. An attacker who controls the ciphertext an application decrypts can crash that application, causing a denial of service.

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 4.1.5, decrypting untrusted JWE ciphertext with A128CBC-HS256, A192CBC-HS384, or A256CBC-HS512 can pass an empty ciphertext buffer to CBC-HMAC unpadding. Insufficient validation allows the empty buffer to be indexed, causing a panic and denial of service. Applications that decrypt attacker-controlled ciphertext with one of these content-encryption algorithms are affected. This issue is fixed in version 4.1.5.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00264 18th percentileScored 2026-11-07
Fix Partial go-jose (go-jose): 4.1.5github.com/go-jose/go-jose/v4 (Go): 4.1.5Red 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 4.1.54.1.5Patch availableCNA
—github.com/go-jose/go-jose/v4 (Go)before 4.1.54.1.5Patch availableGHSA-4w3g-jfj2-cw2q
—github.com/go-jose/go-jose/v3 (Go)up to 3.0.5—No fix listedGHSA-4w3g-jfj2-cw2q
  • go-jose Vendorgo-jose Affected before 4.1.5 Fixed in 4.1.5 Patch available CNA
  • github.com/go-jose/go-jose/v4 (Go) Vendor— Affected before 4.1.5 Fixed in 4.1.5 Patch available GHSA-4w3g-jfj2-cw2q
  • github.com/go-jose/go-jose/v3 (Go) Vendor— Affected up to 3.0.5 Fixed in — No fix listed GHSA-4w3g-jfj2-cw2q

Remediation

Upgrade go-jose and github.com/go-jose/go-jose/v4 to version 4.1.5. 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 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 4.1.5
  • Fix · GHSA-4w3g-jfj2-cw2q github.com/go-jose/go-jose/v4 (Go) Fixed in 4.1.5 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-2026-116585
  2. 2026-10-27 Priority changed: MEDIUM → LOW
  3. 2026-10-28 Alias added: GHSA-4w3g-jfj2-cw2q
  4. 2026-10-28 Fix available: Go/github.com/go-jose/go-jose/[email protected] · GHSA-4w3g-jfj2-cw2q
  5. 2026-10-28 CVSS score added · GHSA-4w3g-jfj2-cw2q
  6. 2026-10-28 Weakness changed · GHSA-4w3g-jfj2-cw2q
  7. 2026-10-28 7 new references · GHSA-4w3g-jfj2-cw2q
  8. 2026-10-29 Affected versions changed · Red Hat
  9. 2026-10-29 CVSS score added · Red Hat
  10. 2026-10-31 Affected versions changed · Red Hat
  11. 2026-10-31 CISA SSVC decision points changed
  12. 2026-11-06 Affected versions changed · Red Hat

References

Advisory 1

Other 6

  • TI-2026-80925 Denial of service in go-jose when parsing JWKs with RSA keys CVSS 3.1HIGH 7.5
  • TI-2026-80924 Go JOSE: Panics in JSON parsing 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