undici WebSocket client vulnerable to denial of service via cumulative fragment bypass
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| undici | undici | unaffected |
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| Package | CPE | Advisory | Released Date |
|---|---|---|---|
| Red Hat Hardened Images | |||
| rust-main-1.96.0-1.hum1 | cpe:/a:redhat:hummingbird:1 | RHSA-2026:22934 | 2026-06-03T00:00:00Z |
| nodejs24-main-24.16.0-1.hum1 | cpe:/a:redhat:hummingbird:1 | RHSA-2026:25561 | 2026-06-13T00:00:00Z |
| Vendor | Product | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Undici | Undici |
|
| Source | ID | Title |
|---|---|---|
Github GHSA |
GHSA-38rv-x7px-6hhq | undici WebSocket client vulnerable to denial of service via cumulative fragment bypass |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.426% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Redhat
Redhat hummingbird |
|
| CPEs | cpe:/a:redhat:hummingbird:1 | |
| Vendors & Products |
Redhat
Redhat hummingbird |
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| References |
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| Metrics |
threat_severity
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threat_severity
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| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Undici
Undici undici |
|
| Vendors & Products |
Undici
Undici undici |
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Impact: The undici WebSocket client enforces maxPayloadSize per-frame but does not enforce the cumulative size of fragmented uncompressed messages. A malicious WebSocket server can stream many small fragments that each pass per-frame validation but collectively exceed the configured limit, causing unbounded memory growth in the client process. The result is memory exhaustion and a denial of service. Affected applications are those using the undici WebSocket client (new WebSocket(...)) that can be induced to connect to an attacker-controlled or compromised WebSocket endpoint. This is a regression specific to undici 8.1.0. The 6.25.0 line shipped the equivalent cumulative check from the start and is unaffected. The 7.x line never had the maxPayloadSize feature and is also unaffected. Patches: Upgrade to undici >= 8.5.0. Workarounds: No workaround is available. The fix must be applied through an upgrade. | |
| Title | undici WebSocket client vulnerable to denial of service via cumulative fragment bypass | |
| Weaknesses | CWE-400 CWE-770 |
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| References |
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| Metrics |
cvssV3_1
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