Medium [CVE-2026-15713] HTTP/2 frame window exhaustion remote denial of service via memory leak
This medium-severity Red Hat Linux advisory covers CVE-2026-15713 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
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 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. This flaw poses a moderate availability impact to applications leveraging libsoup for modern HTTP/2 communications.
Because the memory leakage accrues iteratively over standard session handling paths, an attacker can reliably cause a service disruption without needing local system privileges or user interaction.
Red Hat Product Security notes that while the impact is bounded to a local application process termination, it remains a severe reliability risk for persistent cloud daemons or desktop clients communicating over untrusted wide-area network nodes. Red Hat severity: Low — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).
Weakness: CWE-772.
Is CVE-2026-15713 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-15713 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-15713?
The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
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