# CVE-2026-2708: A request smuggling vulnerability exists in libsoup's HTTP/1 header parsing logic. The…

Source: https://junglewise.ai/threats/cve-2026-2708-a-request-smuggling-vulnerability-exists-in-libsoup-s-http-1  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-23  
License: CC BY 4.0 with a link back

CVE-2026-2708 · Severity: low · CVSS 3.7 · Published 2026-04-23

A request smuggling vulnerability exists in libsoup's HTTP/1 header parsing logic. The soup_message_headers_append_common() function in libsoup/soup-message-headers.c unconditionally appends each header value without validating for duplicate or conflicting Content-Length fields. This allows an attacker to send HTTP requests containing multiple Content-Length headers with differing values.

Technologies: [Gnome Libsoup](https://junglewise.ai/threats/technologies/libsoup), [Redhat Enterprise Linux](https://junglewise.ai/threats/technologies/enterprise-linux). Vendors: [Gnome](https://junglewise.ai/threats/vendors/gnome), [Redhat](https://junglewise.ai/threats/vendors/redhat).

## Quick answers

**Is CVE-2026-2708 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-2708 being exploited in the wild.

**How severe is CVE-2026-2708?** Low severity, with a CVSS score of 3.7, published 23 April 2026.

**Which products and versions are affected?** Gnome Libsoup, Redhat Enterprise Linux. The advisory does not name versions.

**Is there a fix for CVE-2026-2708?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-2708?** Check whether you run Gnome Libsoup or Redhat Enterprise Linux. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Gnome Libsoup
- Redhat Enterprise Linux

## Related threats

- [libsoup HTTP request smuggling via undrained Expect: 100-continue body](https://junglewise.ai/threats/cve-2026-103399-a-flaw-was-found-in-soupserver-libsoup-when-an-http-1-x-client)
- [libsoup heap buffer overflow in permessage-deflate WebSocket extension](https://junglewise.ai/threats/cve-2026-102560-a-flaw-was-found-in-libsoup-when-the-permessage-deflate)
- [libsoup heap buffer overflow in WebSocket handling](https://junglewise.ai/threats/cve-2026-102558-a-flaw-was-found-in-libsoup-when-max-incoming-payload-size-is)
- [libsoup out-of-bounds read in data-URI base64 decoding](https://junglewise.ai/threats/cve-2026-102555-a-flaw-was-found-in-libsoup-the-soup-uri-decode-data-uri)
- [libsoup heap corruption in WebSocket message reassembly](https://junglewise.ai/threats/cve-2026-102557-a-flaw-was-found-in-libsoup-when-reassembling-fragmented)