CVE-2025-47911 — Quadratic parsing complexity in golang.org/x/net/html

Affected: golang.org/x/net/html

The html.Parse function in golang.org/x/net/html has quadratic parsing complexity when processing certain inputs, which can lead to denial of service (DoS) if an attacker provides specially crafted HTML content.

GHSA-355h-qmc2-wpwf — Jetty has HTTP Request Smuggling via Chunked Extension Quoted-String Parsing

Affected: Maven: org.eclipse.jetty:jetty-http

### 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

```python #!/usr/bin/env python3 import…

Most recent entries from all

CVE-2025-47911 — Quadratic parsing complexity in golang.org/x/net/html

GHSA-355h-qmc2-wpwf — Jetty has HTTP Request Smuggling via Chunked Extension Quoted-String Parsing