High severity7.5NVD Advisory· Published Mar 12, 2026· Updated Aug 4, 2026
CVE-2026-1526
CVE-2026-1526
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
undicinpm | < 6.24.0 | 6.24.0 |
undicinpm | >= 7.0.0, < 7.24.0 | 7.24.0 |
Affected products
52- osv-coords50 versionspkg:rpm/almalinux/nodejs-docspkg:rpm/almalinux/nodejspkg:rpm/almalinux/nodejs-full-i18npkg:rpm/almalinux/nodejs24-npmpkg:npm/undicipkg:rpm/almalinux/npmpkg:rpm/almalinux/v8-13.6-develpkg:apk/chainguard/code-serverpkg:apk/chainguard/jitsucom-jitsu-consolepkg:apk/chainguard/jitsucom-jitsu-rotorpkg:apk/chainguard/kibana-8.17pkg:apk/chainguard/kibana-8.17-bitnamipkg:apk/chainguard/kibana-8.17-iamguardedpkg:apk/chainguard/kibana-8.18pkg:apk/chainguard/kibana-8.18-bitnamipkg:apk/chainguard/kibana-8.18-iamguardedpkg:apk/chainguard/kibana-8.19pkg:apk/chainguard/kibana-8.19-bitnamipkg:apk/chainguard/kibana-8.19-iamguardedpkg:apk/chainguard/kibana-9.0pkg:apk/chainguard/kibana-9.0-iamguardedpkg:apk/chainguard/kibana-9.1pkg:apk/chainguard/kibana-9.1-iamguardedpkg:apk/chainguard/kibana-9.2pkg:apk/chainguard/kibana-9.2-iamguardedpkg:apk/chainguard/langfuse-3-workerpkg:apk/chainguard/langfuse-fips-3-workerpkg:apk/chainguard/librechatpkg:apk/chainguard/pelias-apipkg:apk/chainguard/renovatepkg:apk/wolfi/code-serverpkg:apk/wolfi/jitsucom-jitsu-consolepkg:apk/wolfi/langfuse-3-workerpkg:apk/wolfi/renovatepkg:rpm/almalinux/nodejs-npmpkg:rpm/almalinux/nodejs24pkg:rpm/almalinux/nodejs24-develpkg:rpm/almalinux/nodejs24-full-i18npkg:rpm/almalinux/nodejs24-libspkg:rpm/almalinux/nodejs-libspkg:rpm/almalinux/nodejs-packagingpkg:rpm/almalinux/nodejs24-docspkg:apk/chainguard/kibana-9.0-bitnamipkg:apk/chainguard/kibana-9.3pkg:apk/chainguard/kibana-9.3-iamguardedpkg:apk/wolfi/jitsucom-jitsu-rotorpkg:rpm/almalinux/nodejs-develpkg:rpm/almalinux/nodejs-nodemonpkg:rpm/almalinux/nodejs-packaging-bundlerpkg:rpm/almalinux/v8-12.4-devel
< 1:22.22.2-1.el10_1+ 49 more
- (no CPE)range: < 1:22.22.2-1.el10_1
- (no CPE)range: < 1:22.22.2-1.module_el8.10.0+4158+e796f37f
- (no CPE)range: < 1:22.22.2-1.module_el8.10.0+4158+e796f37f
- (no CPE)range: < 1:11.11.0-1.24.14.1.2.el10_1
- (no CPE)range: < 6.24.0
- (no CPE)range: < 1:10.9.7-1.22.22.2.1.module_el8.10.0+4158+e796f37f
- (no CPE)range: < 3:13.6.233.17-1.24.14.1.2.module_el9.7.0+222+ef1c61e1
- (no CPE)range: < 4.110.1-r2
- (no CPE)range: < 2.11.0-r17
- (no CPE)range: < 2.11.0-r17
- (no CPE)range: < 8.17.10-r13
- (no CPE)range: < 8.17.10-r13
- (no CPE)range: < 8.17.10-r13
- (no CPE)range: < 8.18.8-r11
- (no CPE)range: < 8.18.8-r11
- (no CPE)range: < 8.18.8-r11
- (no CPE)range: < 8.19.13-r4
- (no CPE)range: < 8.19.13-r4
- (no CPE)range: < 8.19.13-r4
- (no CPE)range: < 9.0.8-r14
- (no CPE)range: < 9.0.8-r14
- (no CPE)range: < 9.1.10-r7
- (no CPE)range: < 9.1.10-r7
- (no CPE)range: < 9.2.7-r0
- (no CPE)range: < 9.2.6-r3
- (no CPE)range: < 3.179.1-r1
- (no CPE)range: < 3.179.1-r1
- (no CPE)range: < 0.8.4-r3
- (no CPE)range: < 7.6.0-r4
- (no CPE)range: < 43.84.0-r1
- (no CPE)range: < 4.110.1-r2
- (no CPE)range: < 2.11.0-r17
- (no CPE)range: < 3.179.1-r1
- (no CPE)range: < 43.84.0-r1
- (no CPE)range: < 1:10.9.7-1.22.22.2.1.el10_1
- (no CPE)range: < 1:24.14.1-2.el10_1
- (no CPE)range: < 1:24.14.1-2.el10_1
- (no CPE)range: < 1:24.14.1-2.el10_1
- (no CPE)range: < 1:24.14.1-2.el10_1
- (no CPE)range: < 1:22.22.2-1.module_el8.10.0+4158+e796f37f
- (no CPE)range: < 2021.06-6.module_el8.10.0+4158+e796f37f
- (no CPE)range: < 1:24.14.1-2.el10_1
- (no CPE)range: < 9.0.8-r14
- (no CPE)range: < 9.3.2-r0
- (no CPE)range: < 9.3.2-r0
- (no CPE)range: < 2.11.0-r17
- (no CPE)range: < 1:22.22.2-1.module_el8.10.0+4158+e796f37f
- (no CPE)range: < 3.0.1-1.module_el8.10.0+4006+3c416519
- (no CPE)range: < 2021.06-6.module_el8.10.0+4158+e796f37f
- (no CPE)range: < 3:12.4.254.21-1.22.22.2.1.module_el8.10.0+4158+e796f37f
Patches
Vulnerability mechanics
References
25- cna.openjsf.org/security-advisories.htmlnvdVendor AdvisoryWEB
- github.com/advisories/GHSA-vrm6-8vpv-qv8qghsaADVISORY
- github.com/nodejs/undici/security/advisories/GHSA-vrm6-8vpv-qv8qnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-1526ghsaADVISORY
- datatracker.ietf.org/doc/html/rfc7692nvdTechnical DescriptionWEB
- hackerone.com/reports/3481206nvdPermissions RequiredWEB
- owasp.org/www-community/attacks/Denial_of_ServiceghsaWEB
- access.redhat.com/errata/RHSA-2026:13826nvd
- access.redhat.com/errata/RHSA-2026:17789nvd
- access.redhat.com/errata/RHSA-2026:21772nvd
- access.redhat.com/errata/RHSA-2026:21931nvd
- access.redhat.com/errata/RHSA-2026:34342nvd
- access.redhat.com/errata/RHSA-2026:5807nvd
- access.redhat.com/errata/RHSA-2026:7080nvd
- access.redhat.com/errata/RHSA-2026:7123nvd
- access.redhat.com/errata/RHSA-2026:7302nvd
- access.redhat.com/errata/RHSA-2026:7310nvd
- access.redhat.com/errata/RHSA-2026:7350nvd
- access.redhat.com/errata/RHSA-2026:7670nvd
- access.redhat.com/errata/RHSA-2026:7675nvd
- access.redhat.com/errata/RHSA-2026:7983nvd
- access.redhat.com/errata/RHSA-2026:9742nvd
- access.redhat.com/security/cve/CVE-2026-1526nvd
- bugzilla.redhat.com/show_bug.cginvd
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-1526.jsonnvd
News mentions
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