Detections
Analytics

SCA: security update for hpack (GHSA-ffq8-576r-v26g)

high Tenable Cloud Security Plugin ID 423457

Description

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

 - A HTTP/2 implementation built using any version of the Python HPACK library between v1.0.0 and v2.2.0
 could be targeted for a denial of service attack, specifically a so-called "HPACK Bomb" attack. This
 attack occurs when an attacker inserts a header field that is exactly the size of the HPACK dynamic header
 table into the dynamic header table. The attacker can then send a header block that is simply repeated
 requests to expand that field in the dynamic table. This can lead to a gigantic compression ratio of 4,096
 or better, meaning that 16kB of data can decompress to 64MB of data on the target machine. (CVE-2016-6581)

See Also

https://github.com/advisories/GHSA-ffq8-576r-v26g

Plugin Details

Severity: High

ID: 423457

Version: Revision 1.7

Type: Local

Family: SCA Checks

Published: 3/29/2025

Updated: 7/6/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.7

Percentile: 96.44

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2016-6581

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: High

Base Score: 8.7

Threat Score: 6.6

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 7/5/2019

Vulnerability Publication Date: 8/4/2016

Reference Information

CVE: CVE-2016-6581

BID: 92315