CVE-2026-88829Network attack vector

Path-restriction bypass via unrevised pipelined requests

Published Oct 14, 2026 · Updated Oct 14, 2026

Request smuggling in BusyBox httpd in Red Hat Hardened Images allows remote attackers to access backend paths via pipelined requests. The reverse proxy rewrites only the first request's path on a TCP connection, forwarding subsequent requests unchanged. Exposure requires configured URL-prefix forwarding; backend authorization still determines what the forwarded requests can access.

CVSS severity7.2
High
EPSS probability0.32%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Request smuggling in BusyBox httpd in Red Hat Hardened Images allows remote attackers to access backend paths via pipelined requests. The reverse proxy rewrites only the first request's path on a TCP connection, forwarding subsequent requests unchanged. Exposure requires configured URL-prefix forwarding; backend authorization still determines what the forwarded requests can access.

The record

CVE
CVE-2026-88829
Published
Oct 14, 2026
Updated
Oct 14, 2026
Vendor
libuser Project
Product
Red Hat Hardened Images
Classifications
CWE-444
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 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 privilegesunauthenticated

What is affected?

libuser Project · Red Hat Hardened ImagesAffected versions are unavailable in this record.

Published CVSS scores

7.2Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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