compression vulnerable to Denial of Service via memory leak on premature response close
Priority LOW 39CWE-401Published · 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: 12 fixed, 15 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-401.
Summary
compression is a Node.js and Express compression middleware. In versions before 1.8.2, when a client aborts the connection while a compressed response is still being sent, the zlib stream created to compress that response is never destroyed, so each aborted compressed response leaks its native zlib memory. A remote unauthenticated attacker can repeatedly open requests and disconnect early, exhausting the available memory and crashing the server. All applications using compression are affected. The issue is fixed in compression 1.8.2, and users should upgrade to 1.8.2 or later.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00477 41st percentileScored 2026-11-07
Fix Partial compression (compression): 1.8.2compression (npm): 1.8.2Red Hat: 14 advisoriesRed Hat: 12 fixed, 15 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
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| compression | compression | before 1.8.2 | 1.8.2 | Patch available | CNA |
| — | compression (npm) | before 1.8.2 | 1.8.2 | Patch available | GHSA-vc2v-76pw-4v95 |
- compression Vendorcompression Affected before 1.8.2 Fixed in 1.8.2 Patch available CNA
- compression (npm) Vendor— Affected before 1.8.2 Fixed in 1.8.2 Patch available GHSA-vc2v-76pw-4v95
Remediation
- Fix · CNA compression (compression) Fixed in 1.8.2
- Fix · GHSA-vc2v-76pw-4v95 compression (npm) Fixed in 1.8.2 Advisory →
Red Hat 14 advisories
- RHSA-2026:88200 Released 2026-10-22 · Red Hat rating CriticalAnsible automation portal Red Hat Enterprise Linux Images
- Red Hat Ansible Automation Platform 2.2 registry.redhat.io/ansible-automation-platform/bootc-automation-portal-rhel9
- RHSA-2026:87410 Released 2026-10-21 · Red Hat rating CriticalRHOAI 2.25.12 - Red Hat OpenShift AI
- Red Hat OpenShift AI 2.25 registry.redhat.io/rhoai/odh-built-in-detector-rhel9, registry.redhat.io/rhoai/odh-caikit-nlp-rhel9, registry.redhat.io/rhoai/odh-codeflare-operator-rhel9 +47
- RHSA-2026:87004 Released 2026-10-21 · Red Hat rating ImportantRed Hat Ansible Automation Platform 2.6 Product Security and Bug Fix Update
- Red Hat Ansible Automation Platform 2.6 for RHEL 9 automation-gateway-server-2.6.20261019-1.el9ap, automation-platform-ui-2.6.15-1.el9ap, python3.12-pulpcore-3.49.71-1.el9ap +2
Show 11 more Red Hat advisories
- RHSA-2026:86891 Released 2026-10-21 · Red Hat rating CriticalRHOAI 3.5.2 - Red Hat OpenShift AI
- Red Hat OpenShift AI 3.5 registry.redhat.io/rhoai/odh-automl-rhel9, registry.redhat.io/rhoai/odh-built-in-detector-rhel9, registry.redhat.io/rhoai/odh-cli-rhel9 +47
- RHSA-2026:85846 Released 2026-10-20 · Red Hat rating ImportantMigration Toolkit for Containers (MTC) 1.8.18 security and bug fix update
- Red Hat Migration Toolkit 1.8 registry.redhat.io/rhmtc/openshift-migration-controller-rhel8, registry.redhat.io/rhmtc/openshift-migration-registry-rhel8, registry.redhat.io/rhmtc/openshift-migration-ui-rhel8 +1
- RHSA-2026:84734 Released 2026-10-19 · Red Hat rating CriticalRHOAI 3.4.5 - Red Hat OpenShift AI
- Red Hat OpenShift AI 3.4 registry.redhat.io/rhoai/odh-ai-gateway-payload-processing-rhel9, registry.redhat.io/rhoai/odh-automl-rhel9, registry.redhat.io/rhoai/odh-autorag-rhel9 +47
- RHSA-2026:79546 Released 2026-10-08 · Red Hat rating ImportantRed Hat Quay 3.12.23
- Red Hat Quay 3.12 registry.redhat.io/quay/quay-rhel8
- RHSA-2026:79366 Released 2026-10-08 · Red Hat rating ImportantRed Hat Quay 3.10.27
- Red Hat Quay 3.10 registry.redhat.io/quay/quay-rhel8
- RHSA-2026:79088 Released 2026-10-08 · Red Hat rating CriticalRed Hat Developer Hub 1.10.5 release.
- Red Hat Developer Hub 1.10 registry.redhat.io/rhdh/rhdh-hub-rhel9, registry.redhat.io/rhdh/rhdh-rhel9-operator
- RHSA-2026:77656 Released 2026-10-07 · Red Hat rating ImportantRed Hat Quay 3.9.27
- Red Hat Quay 3.9 registry.redhat.io/quay/quay-rhel8
- RHSA-2026:76788 Released 2026-10-06 · Red Hat rating CriticalRed Hat Developer Hub 1.10.5 Plugin Catalog GA plugins release.
- Red Hat Developer Hub 1.10 registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-lightspeed, registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend, registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator +4
- RHSA-2026:72722 Released 2026-09-28 · Red Hat rating ImportantAnsible plug-ins for Red Hat Developer Hub Product Release Update
- Red Hat Ansible Automation Platform 2.2 registry.redhat.io/ansible-automation-platform/automation-portal
- RHSA-2026:72712 Released 2026-09-28 · Red Hat rating ImportantAnsible plug-ins for Red Hat Developer Hub Product Release Update
- Red Hat Ansible Automation Platform 2.1 registry.redhat.io/ansible-automation-platform/automation-portal
- RHSA-2026:69289 Released 2026-09-21 · Red Hat rating ImportantA Subscription Management tool for finding and reporting Red Hat product usage
- Red Hat Discovery 2 registry.redhat.io/discovery/discovery-server-rhel9, registry.redhat.io/discovery/discovery-ui-rhel9
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Node HealthCheck Operator | Affected | No fix yet |
| OpenShift Lightspeed | Affected | No fix yet |
| OpenShift Pipelines | Affected | No fix yet |
| Red Hat Ansible Automation Platform 2 | Affected | No fix planned: Will not fix |
| Red Hat Build of Podman Desktop | Affected | No fix yet |
| Red Hat Ceph Storage 4 | Affected | No fix yet: Fix deferred |
| Red Hat Data Grid 8 | Affected | No fix yet |
| Red Hat Enterprise Linux AI (RHEL AI) 3 | Affected | No fix yet |
| Red Hat Fuse 7 | Affected | No fix planned: Will not fix |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet |
| Red Hat OpenShift GitOps | Affected | No fix planned: Will not fix |
| Red Hat Openshift Data Foundation 4 | Affected | No fix yet |
| Red Hat Trusted Artifact Signer | Affected | No fix yet |
| Red Hat build of Apache Camel - HawtIO 4 | Affected | No fix yet |
| Secrets Management Console for Red Hat OpenShift | Affected | No fix planned: Will not fix |
| Red Hat Ansible Automation Platform 2.1 | Fixed | RHSA-2026:72712 |
| Red Hat Ansible Automation Platform 2.2 | Fixed | RHSA-2026:72722, RHSA-2026:88200 |
| Red Hat Ansible Automation Platform 2.6 for RHEL 9 | Fixed | RHSA-2026:87004 |
| Red Hat Developer Hub 1.10 | Fixed | RHSA-2026:76788, RHSA-2026:79088 |
| Red Hat Discovery 2 | Fixed | RHSA-2026:69289 |
| Red Hat Migration Toolkit 1.8 | Fixed | RHSA-2026:85846 |
| Red Hat OpenShift AI 2.25 | Fixed | RHSA-2026:87410 |
| Red Hat OpenShift AI 3.4 | Fixed | RHSA-2026:84734 |
| Red Hat OpenShift AI 3.5 | Fixed | RHSA-2026:86891 |
| Red Hat Quay 3.10 | Fixed | RHSA-2026:79366 |
| Red Hat Quay 3.12 | Fixed | RHSA-2026:79546 |
| Red Hat Quay 3.9 | Fixed | RHSA-2026:77656 |
Not affected: 23 products
- Gatekeeper 3
- OpenShift Service Mesh 3
- Red Hat 3scale API Management Platform 2
- Red Hat AMQ Broker 7
- Red Hat Ansible Automation Platform 2
- Red Hat Ansible Automation Platform 2.6 for RHEL 10
- Red Hat Ansible Automation Platform 2.6 for RHEL 9
- Red Hat Developer Hub 1.10
- Red Hat Discovery 2
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Hardened Images
- Red Hat Migration Toolkit 1.8
- Red Hat OpenShift AI (RHOAI)
- Red Hat OpenShift AI 2.25
- Red Hat OpenShift AI 3.4
- Red Hat OpenShift AI 3.5
- Red Hat OpenShift Container Platform 4
- Red Hat Quay 3.10
- Red Hat Quay 3.12
- Red Hat Quay 3.9
- Red Hat build of Apache Camel for Spring Boot 4
Timeline
- 2026-10-02 Threatist record created from CVE-2026-87776
- 2026-10-04 Affected versions changed · Red Hat
- 2026-10-06 Alias added: GHSA-vc2v-76pw-4v95
- 2026-10-06 Fix available: npm/[email protected] · GHSA-vc2v-76pw-4v95
- 2026-10-06 CVSS score added · GHSA-vc2v-76pw-4v95
- 2026-10-06 Weakness changed · GHSA-vc2v-76pw-4v95
- 2026-10-06 6 new references · GHSA-vc2v-76pw-4v95
- 2026-10-06 Affected versions changed · Red Hat
- 2026-10-07 Fix available: RHSA-2026:76788 · Red Hat
- 2026-10-07 Fix available: Red Hat Developer Hub 1.10 · Red Hat
- 2026-10-07 Fix available: RHSA-2026:77656 · Red Hat
- 2026-10-08 Fix available: Red Hat Quay 3.9 · Red Hat
- 2026-10-09 Fix available: RHSA-2026:79546 · Red Hat
- 2026-10-09 Fix available: RHSA-2026:79366 · Red Hat
- 2026-10-09 Fix available: RHSA-2026:79088 · Red Hat
- 2026-10-09 Fix available: Red Hat Quay 3.10, Red Hat Quay 3.12 · Red Hat
- 2026-10-10 Affected versions changed · Red Hat
- 2026-10-20 Fix available: RHSA-2026:85846 · Red Hat
- 2026-10-20 Fix available: RHSA-2026:84734 · Red Hat
- 2026-10-20 Fix available: Red Hat Migration Toolkit 1.8, Red Hat OpenShift AI 3.4 · Red Hat
- 2026-10-21 Fix available: RHSA-2026:87004 · Red Hat
- 2026-10-21 Fix available: Red Hat Ansible Automation Platform 2.6 for RHEL 9 · Red Hat
- 2026-10-22 Fix available: RHSA-2026:86891 · Red Hat
- 2026-10-22 Fix available: RHSA-2026:87410 · Red Hat
- 2026-10-23 Fix available: RHSA-2026:88200 · Red Hat
- 2026-10-23 Fix available: Red Hat OpenShift AI 2.25, Red Hat OpenShift AI 3.5 · Red Hat
- 2026-10-23 Priority changed: MEDIUM → LOW
References
Other 5
- https://github.com/expressjs/compression/security/advisories/GHSA-vc2v-76pw-4v95
- https://cna.openjsf.org/security-advisories.html
- https://github.com/expressjs/compression/commit/151f63e91e1b64f8fb0b064e19321a4f28db6bff
- https://github.com/expressjs/compression
- https://github.com/expressjs/compression/releases/tag/v1.8.2
Sources
- CVE-2026-87776 · CVE Program
- CVE-2026-87776 · NVD
- FIRST EPSS
- GHSA-vc2v-76pw-4v95 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-87776 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences