Detections
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Echo: hpack: security update to 4.2.0

medium Tenable Cloud Security Plugin ID 459372

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - hpack is an HTTP/2 Header Encoding for Python. Prior to version 4.2.0, unbounded variable integer decoding
 can cause run-away computation on malformed input leading to O(n^2) runtime, effectively blocking further
 processing with large enough unsanitized input. A fix is available in python-hyper/hpack v4.2.0 to
 restricted variable integer decoding to uint32 to prevent run-away computation. As a workaround, sanitize
 input to hpack decoder for long sequences of `0xFF` values to prevent malicious use. (CVE-2026-59980)

Solution

Update the hpack library and its related packages to version 4.2.0 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-59980

Plugin Details

Severity: Medium

ID: 459372

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/5/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-59980

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 1.7

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 9/26/2026

Vulnerability Publication Date: 9/23/2026

Reference Information

CVE: CVE-2026-59980