# 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.

- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 14 Jul 2026
- **Updated:** 15 Jul 2026
- **Also known as:** AZL-92402, DEBIAN-CVE-2026-15713, ECHO-ba00-ebc6-570a, GHSA-wr2r-8grw-r4x2, UBUNTU-CVE-2026-15713

## 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 (Missing Release of Resource after Effective Lifetime)

## Which versions are affected by CVE-2026-15713?


## How do I fix CVE-2026-15713?

Apply the vendor's patch.

## Is CVE-2026-15713 being exploited?

There is no known exploitation of CVE-2026-15713 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15713 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-15713 in the wild and no public exploit code.

Affected product: Red Hat Enterprise Linux 10. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-15713/ (Markdown: https://insights.sbomify.com/CVE-2026-15713/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15713
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15713
- OSV: https://osv.dev/vulnerability/CVE-2026-15713

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15713/
Summaries are generated and may contain mistakes; the official description above is the record.