CVE-2026-12151

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-12151
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12151.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-12151
Aliases
Downstream
AZL (1)
CGA (75)
CLEANSTART (6)
CLSA (3)
DEBIAN (1)
ECHO (1)
MINI (19)
openSUSE (3)
RHSA (10)
RLSA (6)
ROOT (1)
SUSE (10)
UBUNTU (1)
Related
ALSA (6)
openSUSE (3)
SUSE (10)
Published
2026-06-17T16:05:38Z
Modified
2026-09-29T09:26:38Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
undici WebSocket client vulnerable to denial of service via fragment count bypass
Details

Impact: The undici WebSocket client enforces maxPayloadSize on the cumulative byte count of fragments in a message but does not enforce a limit on the number of fragments. A malicious WebSocket server can stream many small or empty continuation frames that each pass per-frame and cumulative-size validation, collectively 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(...)) or the WebSocketStream API that can be induced to connect to an attacker-controlled or compromised WebSocket endpoint.

All releases starting at undici 6.17.0 are affected.

Patches: Upgrade to undici >= 6.26.0, >= 7.28.0, or >= 8.5.0. Workarounds: No workaround is available. The fix must be applied through an upgrade.

Database specific 
{
    "cna_assigner":  "openjs",
    "cwe_ids":  [
        "CWE-400",
        "CWE-770"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/12xxx/CVE-2026-12151.json"
}
References

Affected packages

Git / github.com/nodejs/undici

Affected ranges

Type
GIT
Repo
https://github.com/nodejs/undici
Events
Introduced
0ca9c1e1faa8cac5ed9310dacbe2e9b5cfd4f6b1
Fixed
551138cbc1742c92242a68216167761075e8a82c
Introduced
1cfe0949053aac6267f11b919cee9315a27f1fd6
Fixed
f9eba0ad9134e1c0977848476bba9d49734696e4
Introduced
d7fbba51772deecb830a297647456a5e9f9fec57
Fixed
a0806e1f66a83db0a792b8407c2e97fcf8ed58af
Database specific
Show details 
{
    "cpe":  "cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:*",
    "extracted_events":  [
        {
            "introduced":  "6.17.0"
        },
        {
            "fixed":  "6.27.0"
        },
        {
            "introduced":  "7.0.0"
        },
        {
            "fixed":  "7.28.0"
        },
        {
            "introduced":  "8.0.0"
        },
        {
            "fixed":  "8.5.0"
        }
    ],
    "source":  "CPE_RANGE"
}

Affected versions

v6.*
v6.17.0
v6.18.0
v6.18.1
v6.18.2
v6.19.0
v6.19.1
v6.19.2
v6.19.3
v6.19.4
v6.19.5
v6.19.6
v6.19.7
v6.19.8
v6.20.0
v6.20.1
v6.21.0
v6.21.1
v6.21.2
v6.21.3
v6.22.0
v6.23.0
v6.24.0
v6.24.1
v6.25.0
v6.26.0
v7.*
v7.0.0
v7.1.0
v7.1.1
v7.10.0
v7.11.0
v7.12.0
v7.13.0
v7.14.0
v7.15.0
v7.16.0
v7.17.0
v7.18.0
v7.18.1
v7.18.2
v7.19.0
v7.19.1
v7.19.2
v7.2.0
v7.2.1
v7.2.2
v7.2.3
v7.20.0
v7.21.0
v7.22.0
v7.23.0
v7.24.0
v7.24.1
v7.24.2
v7.24.3
v7.24.4
v7.24.5
v7.24.6
v7.24.7
v7.24.8
v7.25.0
v7.26.0
v7.27.0
v7.27.1
v7.27.2
v7.3.0
v7.4.0
v7.5.0
v7.6.0
v7.7.0
v7.8.0
v7.9.0
v8.*
v8.0.0
v8.0.1
v8.0.2
v8.0.3
v8.1.0
v8.2.0
v8.3.0
v8.4.0
v8.4.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-12151.json"