CVE-2026-3633

What it is

A flaw was found in libsoup. A remote attacker, by controlling the method parameter of the `soup_message_new()` function, could inject arbitrary headers and additional request data. This vulnerability, known as CRLF (Carriage Return Line Feed) injection, occurs because the method value is not properly escaped during request line construction, potentially leading to HTTP request injection.

At a glance

Exploitability

Can be exploited over the network with an admin-level account, but needs a user to act. Limited direct impact.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-03-17 10:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 10:43 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.2% in the next 30 days (EPSS).
• Severity: 3.9 LOW (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2026-03-17 10:16 UTC

Last modified

2026-06-17 10:43 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-93

Record status

Analyzed

Affected

• Gnome Libsoup
• Redhat Enterprise Linux 6.0
• Redhat Enterprise Linux 7.0
• Redhat Enterprise Linux 8.0
• Redhat Enterprise Linux 9.0
• Redhat Enterprise Linux 10.0

Attack profile CVSS 3.1 · 3.9

Attack vector

Network

Complexity

High

Privileges needed

High

User interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-3633.md and follow it. Check whether this project is affected by CVE-2026-3633. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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