Detections
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Echo: httpx2: security update to 2.10.0

medium Tenable Cloud Security Plugin ID 472282

Description

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

 - HTTPX2 is a next generation HTTP client for Python. From 2.5.0 until 2.10.0, the HTTPX2 Server-Sent Events
 parser in src/httpx2/httpx2/_sse.py repeatedly copies and rescans buffered text in
 _SSELineDecoder.decode() when an attacker-controlled or compromised SSE endpoint splits one unterminated
 line across many response chunks. The behavior affects httpx2.Client.sse() and httpx2.AsyncClient.sse(),
 and the total processing work grows quadratically with the line length, allowing a crafted stream to
 consume excessive CPU and block a synchronous worker or asynchronous event loop. This issue is fixed in
 version 2.10.0. (CVE-2026-84378)

Solution

Update the httpx2 library and its related packages to version 2.10.0 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-84378

Plugin Details

Severity: Medium

ID: 472282

Version: Revision 1.1

Type: Local

Published: 10/3/2026

Updated: 10/3/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.64

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4

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

CVSS Score Source: CVE-2026-84378

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

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

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/3/2026

Vulnerability Publication Date: 9/2/2026

Reference Information

CVE: CVE-2026-84378