---
id: CVE-2026-15713
title: >-
  Libsoup: soupcache: libsoup: http/2 frame window exhaustion remote denial of
  service via memory leak
summary: >-
  A vulnerability was found in libsoup's HTTP/2 protocol implementation. The
  library fails to correctly release memory context blocks under specific stream
  termination conditions, such as when an HTTP/2 connection encounters window
  exhaust…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-772
vendor: Red Hat
product: libsoup3
affected:
  - libsoup3 (all versions)
  - libsoup
  - libsoup
  - libsoup (all versions)
  - libsoup (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-15T13:43:55.364634Z'
published: '2026-07-14'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T17:54:17.625Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-15713'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-15713'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2499941'
    label: RHBZ#2499941
  - url: 'https://gitlab.gnome.org/GNOME/libsoup/-/work_items/541'
tags:
  - cve.org
epss: 0.00349
epssPercentile: 0.28681
ingestedAt: '2026-11-06T18:00:12.493Z'
---

## Overview

A vulnerability was found in libsoup's HTTP/2 protocol implementation. The library fails to correctly release memory context blocks under specific stream termination conditions, such as when an HTTP/2 connection encounters window exhaustion or explicit stream resets. A remote, unauthenticated attacker acting as a malicious network peer can trick the connection engine into allocating stream states that are subsequently leaked during cleanup. Over a sustained period, this flaw allows the remote attacker to consume the system's heap allocations incrementally, triggering a denial of service (DoS) through an ultimate Out-of-Memory (OOM) application crash.

## Affected

- `libsoup3 (all versions)`
- `libsoup`
- `libsoup`
- `libsoup (all versions)`
- `libsoup (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

Users should avoid connecting to untrusted HTTP/2 servers. Implementing network egress filtering to restrict outbound connections to only trusted destinations can reduce exposure to this vulnerability.