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CVE-2026-15711

Libsoup: soupwebsocketconnection: libsoup: websocket remote denial of service via oversized control frame protocol violation

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.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Libsoup Redhat
Products
Libsoup Enterprise Linux Enterprise Linux Eus and 6 more
CVE-2026-15709

Soupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded decompression remote denial of service

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).

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Libsoup Redhat
Products
Libsoup Enterprise Linux Enterprise Linux Eus and 6 more
CVE-2026-102560

Libsoup: libsoup: heap buffer overflow during outgoing permessage-deflate buffer growth

A flaw was found in libsoup. When the permessage-deflate WebSocket extension compresses a very large outgoing message, truncated size calculations used for GByteArray growth could wrap, causing zlib to write past the allocated buffer and resulting in a heap buffer overflow.

CVSS 3.1 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Gnome Libsoup Redhat
Products
Libsoup Libsoup Enterprise Linux and 4 more
CVE-2026-102559

Libsoup: libsoup: heap buffer overflow during websocket client-frame masking

A flaw was found in libsoup. When constructing a masked WebSocket client frame for a very large outgoing payload, size values passed to GByteArray allocation APIs could be truncated while the masking routine still used the full length, causing a heap buffer overflow.

CVSS 3.1 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Gnome Libsoup Redhat
Products
Libsoup Libsoup Enterprise Linux and 7 more
CVE-2026-102558

Libsoup: libsoup: heap buffer overflow during websocket receive-buffer growth

A flaw was found in libsoup. When max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could grow its incoming GByteArray based on an attacker-controlled frame length until the length wrapped, causing a heap buffer overflow while reading frame data.

CVSS 3.1 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Gnome Libsoup Redhat
Products
Libsoup Libsoup Enterprise Linux and 7 more
CVE-2026-102557

Libsoup: libsoup: heap buffer overflow during websocket message reassembly

A flaw was found in libsoup. When reassembling fragmented WebSocket messages into a GByteArray, libsoup did not adequately cap total message size against the limits of the underlying buffer type. A remote peer could send fragments that caused size truncation while the implementation still used the full length, leading to heap corruption or a crash.

CVSS 3.1 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Gnome Libsoup Redhat
Products
Libsoup Libsoup Enterprise Linux and 7 more
CVE-2026-102556

Libsoup: libsoup: heap buffer overflow from websocket pong signal type confusion

A flaw was found in libsoup. When handling an incoming WebSocket Pong frame, SoupWebsocketConnection emitted the ::pong signal with a GByteArray pointer even though the signal is declared to pass a GBytes. Applications connecting a handler that follows the documented GBytes API can trigger heap corruption or a crash upon receiving a crafted Pong.

CVSS 3.1 · 8.6 High EPSS < 1% KEV · Not listed
Vendors
Gnome Libsoup Redhat
Products
Libsoup Libsoup Enterprise Linux and 7 more
CVE-2026-102555

Libsoup: libsoup: heap buffer overflow via uninitialized length in data-uri base64 decoding

A flaw was found in libsoup. The soup_uri_decode_data_uri() function incorrectly treated base64 data-URI payloads as NUL-terminated strings when calling g_base64_decode_inplace(). If the percent-decoded payload contained embedded NUL bytes, the decoded length could remain uninitialized and be used as the size of the returned GBytes. This can lead to an out-of-bounds read or application crash when processing a crafted data URI.

CVSS 3.1 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Gnome Libsoup Redhat
Products
Libsoup Libsoup Enterprise Linux and 2 more
CVE-2026-85197

Libsoup: libsoup: heap use-after-free in libsoup http/2 client on_data_read() via goaway during body upload

A flaw was found in libsoup. A malicious HTTP/2 server or a Man-in-the-Middle (MITM) attacker can exploit a heap use-after-free vulnerability in the HTTP/2 client implementation. This occurs when a GNOME application uploads a file using HTTP/2, and the server sends a GOAWAY frame while the file body is being read asynchronously. This can lead to memory corruption, potentially resulting in information disclosure or arbitrary code execution.

CVSS 3.1 · 7.6 High EPSS < 1% KEV · Not listed
Vendors
Libsoup Red Hat Redhat
Products
Libsoup Enterprise Linux Enterprise Linux and 2 more
CVE-2026-12478

Libsoup: incomplete fix for cve-2026-0716: out-of-bounds read in libsoup websocket frame processing (unmasked path)

The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can send a crafted unmasked frame with a payload length near UINT64_MAX to trigger an OOB read in a libsoup-based client when max_incoming_payload_size is set to 0.

CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed
Vendors
Libsoup Red Hat Redhat
Products
Libsoup Enterprise Linux Enterprise Linux and 1 more
CVE-2026-66338

Libsoup: libsoup: http request smuggling via permissive chunk-size parsing in soup_body_input_stream_read_chunked()

A flaw was found in libsoup. The chunked transfer encoding parser uses a permissive parsing function for chunk sizes that silently accepts inputs violating RFC 9112, including leading whitespace, plus sign prefixes, and trailing invalid characters. When libsoup operates behind a strict frontend proxy, this parsing differential can be exploited to smuggle HTTP requests.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed
Vendors
Gnome Libsoup Redhat
Products
Libsoup Libsoup Enterprise Linux and 1 more
CVE-2026-3633

Libsoup: libsoup: header and http request injection via crlf injection

A flaw was found in libsoup. A remote attacker, by controlling the method parameter of the `soup_message_new()` function, could inject arbitrary headers and additional request data. This vulnerability, known as CRLF (Carriage Return Line Feed) injection, occurs because the method value is not properly escaped during request line construction, potentially leading to HTTP request injection.

CVSS 3.1 · 3.9 Low EPSS < 1% KEV · Not listed
Vendors
Gnome Libsoup Redhat
Products
Libsoup Libsoup Enterprise Linux and 1 more
CVE-2026-3632

Libsoup: libsoup: http smuggling and server-side request forgery via malformed hostnames

A flaw was found in libsoup, a library used by applications to send network requests. This vulnerability occurs because libsoup does not properly validate hostnames, allowing special characters to be injected into HTTP headers. A remote attacker could exploit this to perform HTTP smuggling, where they can send hidden, malicious requests alongside legitimate ones. In certain situations, this could lead to Server-Side Request Forgery (SSRF), enabling an attacker to force the server to make unauthorized requests to other internal or external systems. The impact is low, as SoupServer is not actually used in internet infrastructure.

CVSS 3.1 · 3.9 Low EPSS < 1% KEV · Not listed
Vendors
Gnome Libsoup Redhat
Products
Libsoup Libsoup Enterprise Linux and 1 more
CVE-2026-2708

Libsoup: libsoup: http request smuggling via duplicate content-length headers

A request smuggling vulnerability exists in libsoup's HTTP/1 header parsing logic. The soup_message_headers_append_common() function in libsoup/soup-message-headers.c unconditionally appends each header value without validating for duplicate or conflicting Content-Length fields. This allows an attacker to send HTTP requests containing multiple Content-Length headers with differing values.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed
Vendors
Gnome Libsoup Redhat
Products
Libsoup Libsoup Enterprise Linux and 1 more
CVE-2026-15713

Libsoup: soupcache: libsoup: http/2 frame window exhaustion remote denial of service via memory leak

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.

CVSS 3.1 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Libsoup Redhat
Products
Libsoup Enterprise Linux Rhel Els
CVE-2026-12547

Libsoup: information disclosure in libsoup via soupauthmanager proxy credential leak on proxy switch

SoupAuthManager caches proxy authentication credentials without scoping them to the proxy authority (host:port). When the proxy configuration changes (e.g., via system settings or WPAD), cached Proxy-Authorization headers from the previous proxy are sent to the new proxy, leaking credentials.

CVSS 3.1 · 3.4 Low EPSS < 1% KEV · Not listed
Vendors
Libsoup Redhat
Products
Libsoup Enterprise Linux
CVE-2026-66339

Libsoup: libsoup: proxy credentials leak to destination server via proxy-authorization header in connect tunnels

A flaw was found in libsoup. After a CONNECT tunnel is established through an HTTP proxy, libsoup incorrectly attaches the Proxy-Authorization header to subsequent HTTPS requests sent through that tunnel to the destination server. This allows the destination server to capture proxy credentials, leading to information disclosure.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Gnome Libsoup Redhat
Products
Libsoup Libsoup Enterprise Linux and 1 more
CVE-2026-66337

Libsoup: libsoup: heap buffer over-read via integer underflow in soup_filter_input_stream_read_until()

A flaw was found in libsoup. An unsigned integer underflow in the soup_filter_input_stream_read_until() function causes a heap buffer over-read when parsing multipart HTTP responses. A malicious HTTP server can exploit this by sending a crafted multipart response, potentially causing the client application to crash or disclose sensitive heap memory.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Gnome Libsoup Redhat
Products
Libsoup Libsoup Enterprise Linux and 1 more
CVE-2026-3634

Libsoup: libsoup: http header injection and response splitting via crlf injection in content-type header

A flaw was found in libsoup. An attacker controlling the value used to set the Content-Type header can inject a Carriage Return Line Feed (CRLF) sequence due to improper input sanitization in the `soup_message_headers_set_content_type()` function. This vulnerability allows for the injection of arbitrary header-value pairs, potentially leading to HTTP header injection and response splitting attacks.

CVSS 3.1 · 3.9 Low EPSS < 1% KEV · Not listed
Vendors
Gnome Libsoup Redhat
Products
Libsoup Libsoup Enterprise Linux and 1 more
CVE-2026-3099

Libsoup: libsoup: authentication bypass via digest authentication replay attack

A flaw was found in Libsoup. The server-side digest authentication implementation in the SoupAuthDomainDigest class does not properly track issued nonces or enforce the required incrementing nonce-count (nc) attribute. This vulnerability allows a remote attacker to capture a single valid authentication header and replay it repeatedly. Consequently, the attacker can bypass authentication and gain unauthorized access to protected resources, impersonating the legitimate user.

CVSS 3.1 · 5.8 Medium EPSS < 1% KEV · Not listed
Vendors
Gnome Libsoup Redhat
Products
Libsoup Libsoup Enterprise Linux and 1 more