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Review reviewHigh

CVE-2026-1528

undici undici, Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10

ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process. Patches Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

CVSS
7.5
EPSS
0.49%
39.4% percentile
CISA KEV
Not listed
Published
2026.03.13
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.49%
Technical severityCVSS 7.5

Vulnerability overview

ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process. Patches Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.

Affected product and versions

Product
undici undici, Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10
Affected versions
>= >= 6.0.0 < 6.24.0, 7.0.0 < 7.24.0, < 6.24.0, >= 7.0.0 < 7.24.0
Fixed versions
6.24.0, 7.24.0

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that undici undici, Cryostat 4 on RHEL 9, Red Hat Enterprise Linux 10 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-1284, CWE-248