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libsoup EUVDEUVD-2026-44428

| CVE-2026-15711 HIGH
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-07-14 redhat GHSA-w948-qrw5-cffc
7.5
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

Remote unauthenticated attacker sends one malformed frame with no user interaction (AV:N/AC:L/PR:N/UI:N); impact is a crash affecting only availability (A:H, C:N/I:N), scope unchanged.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.5 MEDIUM
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Jul 14, 2026 - 21:03 vuln.today
CVE Published
Jul 14, 2026 - 19:45 nvd
HIGH 7.5

DescriptionCVE.org

A vulnerability was found in libsoup's WebSocket frame parsing implementation. The library fails to validate length rules specified in RFC 6455 §5.5, which mandates that all WebSocket control frames (e.g., PING, PONG, CLOSE) contain a payload of 125 bytes or less. A remote, unauthenticated attacker can exploit this by sending a non-compliant, oversized control frame. Because the parser handles this protocol violation improperly instead of throwing an immediate connection termination error, it triggers a internal processing crash, resulting in a remote denial of service (DoS) for applications utilizing libsoup WebSockets.

AnalysisAI

Remote denial of service in libsoup, the GNOME HTTP client/server library, allows unauthenticated attackers to crash any application using libsoup's WebSocket support by sending a single malformed control frame. The parser fails to enforce RFC 6455's 125-byte limit on PING/PONG/CLOSE control frames and mishandles the oversized payload instead of cleanly closing the connection, causing an internal processing crash. Red Hat reports the flaw across RHEL 6 through 10; no public exploit has been identified at time of analysis and no EPSS score was provided.

Technical ContextAI

libsoup is the HTTP and WebSocket library underpinning much of the GNOME stack (WebKitGTK, Epiphany, and numerous GLib/GTK applications and services). The defect lives in its WebSocket frame parser: RFC 6455 §5.5 mandates that all control frames (PING, PONG, CLOSE) carry a payload of 125 bytes or fewer, and a compliant implementation must fail the connection immediately on violation. libsoup instead accepts the non-compliant oversized control frame and processes it improperly, leading to a crash. The root cause maps to CWE-770 (Allocation of Resources Without Limits or Throttling) - the parser does not enforce the protocol-mandated bound before acting on the frame, so a violation that should terminate the connection instead drives the process into an unrecoverable state.

RemediationAI

Released patched version not independently confirmed from the provided data - an upstream tracking issue exists (https://gitlab.gnome.org/GNOME/libsoup/-/issues/515) but no exact fixed libsoup version or tagged release is cited. Monitor and apply the Red Hat security update when published (https://access.redhat.com/security/cve/CVE-2026-15711) and the corresponding upstream libsoup release, then restart or update all applications and services linked against libsoup so they pick up the patched library. As a compensating control until a patch is applied, restrict exposure of any internet-facing service that terminates WebSocket connections through libsoup - for example, front it with a reverse proxy or WAF that enforces RFC 6455 control-frame length limits and drops control frames exceeding 125 bytes, which removes the malicious input before it reaches libsoup at the cost of adding a proxy hop. If WebSocket functionality is not required by a given deployment, disabling it eliminates the attack surface entirely but breaks any feature depending on it. Because impact is limited to availability, ensure affected services have automatic restart/supervision (e.g. systemd Restart=on-failure) to reduce downtime from crash attempts, accepting that this mitigates rather than prevents the DoS.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Micro 5.3 Affected

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EUVD-2026-44428 vulnerability details – vuln.today

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