CVE-2026-3632Public exploitNetwork attack vector

HTTP request smuggling via unsanitized Host header

Published Mar 17, 2026 · Updated Mar 17, 2026

HTTP request smuggling in libsoup on Red Hat Enterprise Linux 7 through 10 allows attackers to inject requests via crafted hostnames. soup_message_set_request_host_from_uri() copies the GUri host value directly into the Host header without rejecting CR or LF characters. Reachability requires an application to process an attacker-controlled URL; a smuggled request can become SSRF in server-side document conversion.

CVSS severity3.9
Low
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP request smuggling in libsoup on Red Hat Enterprise Linux 7 through 10 allows attackers to inject requests via crafted hostnames. soup_message_set_request_host_from_uri() copies the GUri host value directly into the Host header without rejecting CR or LF characters. Reachability requires an application to process an attacker-controlled URL; a smuggled request can become SSRF in server-side document conversion.

The record

CVE
CVE-2026-3632
Published
Mar 17, 2026
Updated
Mar 17, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 10
Classifications
CWE-1286, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

3.9Red Hat, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L
5.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1286Improper Validation of Syntactic Correctness of Input
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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