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SCA: security update for guzzlehttp/psr7 (GHSA-vm85-hxw5-5432)

medium Tenable Self-Hosted Container Security Plugin ID 443586

Description

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

 - guzzlehttp/psr7 is a PSR-7 HTTP message library implementation in PHP. Prior to 2.12.1, guzzlehttp/psr7
 did not reject CR/LF characters in certain first-party HTTP start-line fields: the request method,
 protocol version, and response reason phrase. If an application placed attacker-controlled data into one
 of those fields and later serialized the PSR-7 message as raw HTTP/1.x, for example with
 Message::toString() or an equivalent serializer, the serialized message could contain attacker-controlled
 header lines. The issue can also be reached through Message::parseRequest() or Message::parseResponse()
 when malformed raw messages are parsed into first-party PSR-7 objects and then serialized again. Creating
 or modifying a Request, Response, or other PSR-7 object alone is not sufficient. The issue requires the
 malformed message to be serialized and written to the network, forwarded, replayed, or otherwise processed
 by software that does not independently reject the malformed start line. This vulnerability is fixed in
 2.12.1. (CVE-2026-55766)

Solution

Update the guzzlehttp/psr7 library and its related packages to version 2.12.1 or later.

See Also

https://github.com/advisories/GHSA-vm85-hxw5-5432

Plugin Details

Severity: Medium

ID: 443586

Version: Revision 1.6

Type: Local

Family: SCA Checks

Published: 6/19/2026

Updated: 7/2/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 2.1

Percentile: 7.79

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

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

CVSS Score Source: CVE-2026-55766

CVSS v3

Risk Factor: Medium

Base Score: 4.8

Temporal Score: 4.2

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

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 6/19/2026

Vulnerability Publication Date: 6/19/2026

Reference Information

CVE: CVE-2026-55766