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libsoup CVE-2026-15709

| EUVDEUVD-2026-44408 HIGH
Improper Handling of Highly Compressed Data (Data Amplification) (CWE-409)
2026-07-14 redhat GHSA-gv2g-7h3v-q5f3
Denial Of Service Red Hat Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9 Suse Red Hat
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

A remote unauthenticated peer triggers memory exhaustion with no user interaction (AV:N/AC:L/PR:N/UI:N); impact is availability-only OOM DoS, so C:N/I:N/A:H.

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 - 21:05 vuln.today
CVE Published
Jul 14, 2026 - 19:41 nvd
HIGH 7.5

DescriptionCVE.org

A flaw was found in libsoup's WebSocket implementation when using the permessage-deflate extension. The extension's decompression loop (inflate()) processes data in chunks without enforcing an upper boundary limit on the output buffer size. While libsoup limits the incoming compressed frame size via max_incoming_payload_size, it fails to track or limit memory allocation during decompression. A separate check for decompressed size (max_total_message_size) exists but executes only after inflation is complete, and it is entirely disabled by default for client connections. A remote, unauthenticated attacker can exploit this by sending a small, highly compressed payload (a decompression bomb), causing unbounded memory allocation that triggers an Out-of-Memory (OOM) crash and a Denial of Service (DoS).

AnalysisAI

Denial of service in libsoup's WebSocket permessage-deflate implementation lets a remote, unauthenticated attacker crash applications by sending a small, highly compressed 'decompression bomb' that expands without bound during inflation, exhausting memory and triggering an Out-of-Memory kill. All Red Hat Enterprise Linux 6 through 10 ship the affected libsoup HTTP/WebSocket library, and client connections are especially exposed because the decompressed-size guard (max_total_message_size) is disabled by default for clients. There is no public exploit identified at time of analysis and this CVE is not listed in CISA KEV.

Technical ContextAI

libsoup is the GNOME project's GObject-based HTTP client/server library used by desktop applications, WebKitGTK, and many Linux services for HTTP and WebSocket communication. The flaw sits in the permessage-deflate WebSocket extension (RFC 7692), which uses zlib inflate() to decompress frames. libsoup bounds the compressed input via max_incoming_payload_size but never tracks or caps the memory allocated as the inflate() loop grows its output buffer chunk-by-chunk. The complementary max_total_message_size check runs only after decompression completes and is turned off by default on client connections, so the amplification is never interrupted mid-inflation. This maps to CWE-409 (Improper Handling of Highly Compressed Data / Data Amplification), the classic 'decompression bomb' root cause where a tiny input yields disproportionately large output.

RemediationAI

No vendor-released patched libsoup version was identified in the provided data - the references point to Red Hat's CVE page, Bugzilla 2499922, and GNOME GitLab issue 511 rather than a tagged fixed release, so monitor https://access.redhat.com/security/cve/CVE-2026-15709 and apply the distribution libsoup update as soon as Red Hat publishes fixed package NVRs. As a compensating control until patched, disable or refuse the permessage-deflate WebSocket extension so no compressed frames are inflated (this removes the amplification vector at the cost of losing WebSocket compression bandwidth savings), and where the API allows, set an explicit max_total_message_size on client WebSocket connections rather than relying on the default-disabled value to bound decompressed output (trade-off: legitimate large messages may be rejected). For server-side deployments, front libsoup-based services with a proxy or WAF that can cap WebSocket frame size and per-connection memory, and restrict which peers clients are permitted to connect to.

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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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CVE-2026-15709 vulnerability details – vuln.today
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