Nixpkgs security tracker
NIXPKGS-2026-2279
GitHub issue
published 6 hours ago
Libsoup: libsoup: http request smuggling via permissive chunk-size parsing in soup_body_input_stream_read_chunked()
Permalink
CVE-2026-66338
5.4 MEDIUM
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): High (H)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Changed (C)
- Confidentiality (C): Low (L)
- Integrity (I): Low (L)
- Availability (A): None (N)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): High (H)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): Low (L)
- Modified Scope (MS): Changed (C)
- Modified Integrity (MI): Low (L)
- Modified Availability (MA): None (N)
by @LeSuisse Activity log
- Created suggestion
- @LeSuisse ignored package libsoup_2_4
- @LeSuisse accepted
- @LeSuisse published on GitHub
Libsoup: libsoup: http request smuggling via permissive chunk-size parsing in soup_body_input_stream_read_chunked()
A flaw was found in libsoup. The chunked transfer encoding parser uses a permissive parsing function for chunk sizes that silently accepts inputs violating RFC 9112, including leading whitespace, plus sign prefixes, and trailing invalid characters. When libsoup operates behind a strict frontend proxy, this parsing differential can be exploited to smuggle HTTP requests.
References
Affected products
libsoup
libsoup3
Matching in nixpkgs
Ignored packages (1)
pkgs.libsoup_2_4
None
Package maintainers
-
@7c6f434c Michael Raskin <7c6f434c@mail.ru>
-
@jtojnar Jan Tojnar <jtojnar@gmail.com>
-
@bobby285271 Bobby Rong <rjl931189261@126.com>