CVE-2026-15713 Libsoup: soupcache: libsoup: http/2 frame window exhaustion remote denial of service via memory leak
A remote attacker can cause a denial of service in applications using libsoup by triggering a memory leak during HTTP/2 stream termination.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-15713?
CVE-2026-15713 is a medium-severity denial of service vulnerability in Red Hat Enterprise Linux 10, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-772
Which versions are affected by CVE-2026-15713?
How do I fix CVE-2026-15713?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-15713 being exploited?
There is no known exploitation of CVE-2026-15713 in the wild and no public exploit code.
Sources
Also known as AZL-92402, DEBIAN-CVE-2026-15713, ECHO-ba00-ebc6-570a, GHSA-wr2r-8grw-r4x2, UBUNTU-CVE-2026-15713.