CVE-2026-1526
undici is vulnerable to Unbounded Memory Consumption in undici WebSocket permessage-deflate Decompression
Description
The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforcing any limit on the decompressed data size. A malicious WebSocket server can send a small compressed frame (a "decompression bomb") that expands to an extremely large size in memory, causing the Node.js process to exhaust available memory and crash or become unresponsive. The vulnerability exists in the PerMessageDeflate.decompress() method, which accumulates all decompressed chunks in memory and concatenates them into a single Buffer without checking whether the total size exceeds a safe threshold.
INFO
Published Date :
March 12, 2026, 9:16 p.m.
Last Modified :
July 2, 2026, 12:16 p.m.
Remotely Exploit :
Yes !
Source :
ce714d77-add3-4f53-aff5-83d477b104bb
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | ce714d77-add3-4f53-aff5-83d477b104bb | ||||
| CVSS 3.1 | HIGH | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
Solution
- Update the undici library to the latest version.
- Apply patches if available from the vendor.
- Monitor memory usage after updating.
Public PoC/Exploit Available at Github
CVE-2026-1526 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-1526.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-1526 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-1526
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-1526 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-1526 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 02, 2026
Action Type Old Value New Value Added Reference https://access.redhat.com/errata/RHSA-2026:34342 Changed Affected [{'cpes': ['cpe:/a:redhat:cryostat:4::el9'], 'vendor': 'Red Hat', 'product': 'Cryostat 4 on RHEL 9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux_eus:10.0'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream EUS (v. 10.0)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:10.1'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream (v. 10)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:enterprise_linux:8::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream (v. 8)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_eus:9.6::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream EUS (v.9.6)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:enterprise_linux:9::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream (v. 9)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhdh:1.8::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Developer Hub 1.8', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhdh:1.9::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Developer Hub 1.9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_ai:2.16::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI 2.16', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_devspaces:3.28::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces 3.28', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_pipelines:1.20::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Pipelines 1.2', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_lightspeed'], 'vendor': 'Red Hat', 'product': 'OpenShift Lightspeed', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_pipelines:1'], 'vendor': 'Red Hat', 'product': 'OpenShift Pipelines', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhdh:1'], 'vendor': 'Red Hat', 'product': 'Red Hat Developer Hub', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_devspaces:3'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:ansible_portal:2'], 'vendor': 'Red Hat', 'product': 'Self-service automation portal 2', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:8'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jbosseapxp'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform Expansion Pack', 'defaultStatus': 'unaffected'}] [{'cpes': ['cpe:/a:redhat:cryostat:4::el9'], 'vendor': 'Red Hat', 'product': 'Cryostat 4 on RHEL 9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux_eus:10.0'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream EUS (v. 10.0)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:10.1'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream (v. 10)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:enterprise_linux:8::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream (v. 8)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_eus:9.6::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream EUS (v.9.6)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:enterprise_linux:9::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream (v. 9)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:cluster_observability_operator:1.5::el9'], 'vendor': 'Red Hat', 'product': 'Cluster Observability Operator 1.5.0', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhdh:1.8::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Developer Hub 1.8', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhdh:1.9::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Developer Hub 1.9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_ai:2.16::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI 2.16', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_devspaces:3.28::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces 3.28', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_pipelines:1.20::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Pipelines 1.2', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_lightspeed'], 'vendor': 'Red Hat', 'product': 'OpenShift Lightspeed', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_pipelines:1'], 'vendor': 'Red Hat', 'product': 'OpenShift Pipelines', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhdh:1'], 'vendor': 'Red Hat', 'product': 'Red Hat Developer Hub', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_devspaces:3'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:ansible_portal:2'], 'vendor': 'Red Hat', 'product': 'Self-service automation portal 2', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:8'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jbosseapxp'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform Expansion Pack', 'defaultStatus': 'unaffected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/a:redhat:cryostat:4::el9'], 'vendor': 'Red Hat', 'product': 'Cryostat 4 on RHEL 9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux_eus:10.0'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream EUS (v. 10.0)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/o:redhat:enterprise_linux:10.1'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream (v. 10)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:enterprise_linux:8::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream (v. 8)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhel_eus:9.6::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream EUS (v.9.6)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:enterprise_linux:9::appstream'], 'vendor': 'Red Hat', 'product': 'Red Hat Enterprise Linux AppStream (v. 9)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhdh:1.8::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Developer Hub 1.8', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhdh:1.9::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat Developer Hub 1.9', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_ai:2.16::el8'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI 2.16', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_devspaces:3.28::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces 3.28', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_pipelines:1.20::el9'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Pipelines 1.2', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_lightspeed'], 'vendor': 'Red Hat', 'product': 'OpenShift Lightspeed', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_pipelines:1'], 'vendor': 'Red Hat', 'product': 'OpenShift Pipelines', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:rhdh:1'], 'vendor': 'Red Hat', 'product': 'Red Hat Developer Hub', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_ai'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift AI (RHOAI)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openshift_devspaces:3'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenShift Dev Spaces', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:ansible_portal:2'], 'vendor': 'Red Hat', 'product': 'Self-service automation portal 2', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:jboss_enterprise_application_platform:8'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform 8', 'defaultStatus': 'unaffected'}, {'cpes': ['cpe:/a:redhat:jbosseapxp'], 'vendor': 'Red Hat', 'product': 'Red Hat JBoss Enterprise Application Platform Expansion Pack', 'defaultStatus': 'unaffected'}] Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-770 Added Reference https://access.redhat.com/errata/RHSA-2026:13826 Added Reference https://access.redhat.com/errata/RHSA-2026:17789 Added Reference https://access.redhat.com/errata/RHSA-2026:21772 Added Reference https://access.redhat.com/errata/RHSA-2026:21931 Added Reference https://access.redhat.com/errata/RHSA-2026:5807 Added Reference https://access.redhat.com/errata/RHSA-2026:7080 Added Reference https://access.redhat.com/errata/RHSA-2026:7123 Added Reference https://access.redhat.com/errata/RHSA-2026:7302 Added Reference https://access.redhat.com/errata/RHSA-2026:7310 Added Reference https://access.redhat.com/errata/RHSA-2026:7350 Added Reference https://access.redhat.com/errata/RHSA-2026:7670 Added Reference https://access.redhat.com/errata/RHSA-2026:7675 Added Reference https://access.redhat.com/errata/RHSA-2026:7983 Added Reference https://access.redhat.com/errata/RHSA-2026:9742 Added Reference https://access.redhat.com/security/cve/CVE-2026-1526 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2447142 Added Reference https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1526.json -
CVE Modified by ce714d77-add3-4f53-aff5-83d477b104bb
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/nodejs/undici/', 'vendor': 'undici', 'product': 'undici', 'versions': [{'status': 'affected', 'version': '< 6.24.0; 7.0.0 < 7.24.0'}, {'status': 'unaffected', 'version': '6.24.0: 7.24.0'}], 'packageName': 'undici', 'collectionURL': 'https://github.com/nodejs/undici/', 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-1526', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-03-13T18:04:06.608247Z'} -
Initial Analysis by [email protected]
Mar. 20, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* versions up to (excluding) 6.24.0 *cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* versions from (including) 7.0.0 up to (excluding) 7.24.0 Added Reference Type openjs: https://cna.openjsf.org/security-advisories.html Types: Vendor Advisory Added Reference Type openjs: https://datatracker.ietf.org/doc/html/rfc7692 Types: Technical Description Added Reference Type openjs: https://github.com/nodejs/undici/security/advisories/GHSA-vrm6-8vpv-qv8q Types: Vendor Advisory Added Reference Type openjs: https://hackerone.com/reports/3481206 Types: Permissions Required -
New CVE Received by ce714d77-add3-4f53-aff5-83d477b104bb
Mar. 12, 2026
Action Type Old Value New Value Added Description The undici WebSocket client is vulnerable to a denial-of-service attack via unbounded memory consumption during permessage-deflate decompression. When a WebSocket connection negotiates the permessage-deflate extension, the client decompresses incoming compressed frames without enforcing any limit on the decompressed data size. A malicious WebSocket server can send a small compressed frame (a "decompression bomb") that expands to an extremely large size in memory, causing the Node.js process to exhaust available memory and crash or become unresponsive. The vulnerability exists in the PerMessageDeflate.decompress() method, which accumulates all decompressed chunks in memory and concatenates them into a single Buffer without checking whether the total size exceeds a safe threshold. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-409 Added Reference https://cna.openjsf.org/security-advisories.html Added Reference https://datatracker.ietf.org/doc/html/rfc7692 Added Reference https://github.com/nodejs/undici/security/advisories/GHSA-vrm6-8vpv-qv8q Added Reference https://hackerone.com/reports/3481206