CVE-2026-12478

libsoup is an HTTP client/server library for GNOME. It uses GObjects and the glib main loop, to integrate well with GNOME applications, and also has a synchronous API, for use in threaded applications.

Security Fix(es):

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.(CVE-2026-12478)

libsoup is an HTTP client/server library for GNOME. It uses GObjects and the glib main loop, to integrate well with GNOME applications, and also has a synchronous API, for use in threaded applications.

Security Fix(es):

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.(CVE-2026-12478)

libsoup is an HTTP client/server library for GNOME. It uses GObjects and the glib main loop, to integrate well with GNOME applications, and also has a synchronous API, for use in threaded applications.

Security Fix(es):

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.(CVE-2026-12478)

Libsoup is an HTTP library implementation in C. It was originally part of a SOAP (Simple Object Access Protocol) implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate packages.

Security Fix(es):

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.(CVE-2026-12478)

libsoup is an HTTP client/server library for GNOME. It uses GObjects and the glib main loop, to integrate well with GNOME applications, and also has a synchronous API, for use in threaded applications.

Security Fix(es):

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.(CVE-2026-12478)

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.(CVE-2026-2708)

Libsoup is an HTTP library implementation in C. It was originally part of a SOAP (Simple Object Access Protocol) implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate packages.

Security Fix(es):

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.(CVE-2026-12478)

Libsoup is an HTTP library implementation in C. It was originally part of a SOAP (Simple Object Access Protocol) implementation called Soup, but the SOAP and non-SOAP parts have now been split into separate packages.

Security Fix(es):

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.(CVE-2026-12478)

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.

These are all security issues fixed in the libsoup-3_0-0-3.6.6-7.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the libsoup-2_4-1-2.74.3-24.1 package on the GA media of openSUSE Tumbleweed.

This update for libsoup fixes the following issues

• CVE-2026-0716: out-of-bounds read when processing a crafted unmasked frame with a payload length near UINT64_MAX sent by a WebSocket server (bsc#1256418).

This update for libsoup fixes the following issues:

• Incomplete fix for CVE-2026-12478: out-of-bounds read in the process_frame() function of SoupWebSocketConnection (bsc#1271401).

This update for libsoup fixes the following issues

• CVE-2026-0716: out-of-bounds read when processing a crafted unmasked frame with a payload length near UINT64_MAX sent by a WebSocket server (bsc#1256418).

This update for libsoup fixes the following issues:

• CVE-2026-12478: websocket: Fix out-of-bounds read when reading unmasked frame (bsc#1271401).
• CVE-2026-12547: Header 'Proxy-Authorization' leads to credentials being send to different proxy after proxy switch (bsc#1272195).
• CVE-2026-15711: SoupWebsocketConnection: WebSocket remote denial of service via oversized control frame protocol violation (bsc#1271446).
• CVE-2026-15712: SoupClientMessageIOHTTP2: HTTP/2 GOAWAY frame parsing heap buffer over-read via invalid NUL- termination assumption (bsc#1271447).
• CVE-2026-15714: SoupMultipartInputStream: libsoup: Out-of-bounds read in soup_multipart_input_stream_read_headers via an oversized multipart boundary string (bsc#1271449).
• CVE-2026-66339: proxy credentials leak to destination server via Proxy-Authorization header in CONNECT tunnels (bsc#1273156).

This update for libsoup fixes the following issues:

• CVE-2026-12478: websocket: Fix out-of-bounds read when reading unmasked frame (bsc#1271401).
• CVE-2026-12547: Header 'Proxy-Authorization' leads to credentials being send to different proxy after proxy switch (bsc#1272195).
• CVE-2026-15711: SoupWebsocketConnection: WebSocket remote denial of service via oversized control frame protocol violation (bsc#1271446).
• CVE-2026-15712: SoupClientMessageIOHTTP2: HTTP/2 GOAWAY frame parsing heap buffer over-read via invalid NUL- termination assumption (bsc#1271447).
• CVE-2026-15714: SoupMultipartInputStream: libsoup: Out-of-bounds read in soup_multipart_input_stream_read_headers via an oversized multipart boundary string (bsc#1271449).
• CVE-2026-66339: proxy credentials leak to destination server via Proxy-Authorization header in CONNECT tunnels (bsc#1273156).

This update for libsoup fixes the following issues:

• CVE-2026-12478: websocket: Fix out-of-bounds read when reading unmasked frame (bsc#1271401).
• CVE-2026-12547: Header 'Proxy-Authorization' leads to credentials being send to different proxy after proxy switch (bsc#1272195).
• CVE-2026-15711: SoupWebsocketConnection: WebSocket remote denial of service via oversized control frame protocol violation (bsc#1271446).
• CVE-2026-15713: SoupCache: libsoup: HTTP/2 frame window exhaustion remote denial of service via memory leak (bsc#1271448).
• CVE-2026-15714: SoupMultipartInputStream: libsoup: Out-of-bounds read in soup_multipart_input_stream_read_headers via an oversized multipart boundary string (bsc#1271449).
• CVE-2026-66339: proxy credentials leak to destination server via Proxy-Authorization header in CONNECT tunnels (bsc#1273156).
• CVE-2026-102556: Heap buffer overflow from WebSocket Pong signal type confusion (bsc#1283300).
• CVE-2026-102557: Heap buffer overflow during WebSocket message reassembly (bsc#1283301).
• CVE-2026-102558: Heap buffer overflow during WebSocket receive-buffer growth (bsc#1283302).
• CVE-2026-102559: Heap buffer overflow during WebSocket client-frame masking (bsc#1283303).
• CVE-2026-103399: incomplete request body draining in HTTP/1.x early responses can allow HTTP request smuggling (bsc#1283831).

It was discovered that libsoup incorrectly handled certain WebSocket frames. A remote attacker could possibly use this issue to cause an application to crash or expose sensitive information. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-12478)

It was discovered that libsoup incorrectly handled certain data URIs. A remote attacker could possibly use this issue to cause an application to crash or expose sensitive information. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-102555)

It was discovered that libsoup incorrectly handled certain WebSocket messages. A remote attacker could possibly use this issue to cause an application to crash. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-102556)

It was discovered that libsoup incorrectly handled fragmented WebSocket messages. A remote attacker could possibly use this issue to cause an application to crash. (CVE-2026-102557)

It was discovered that libsoup incorrectly handled certain WebSocket frames. A remote attacker could possibly use this issue to cause an application to crash. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-102558)

It was discovered that libsoup incorrectly handled large WebSocket messages. An attacker could possibly use this issue to cause an application to crash. (CVE-2026-102559)

It was discovered that libsoup incorrectly handled compressed WebSocket messages. An attacker could possibly use this issue to cause an application to crash. This issue only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS, and Ubuntu 26.10. (CVE-2026-102560)

It was discovered that libsoup did not properly handle certain HTTP requests. A remote attacker could possibly use this issue to inject arbitrary HTTP requests. (CVE-2026-103399)

It was discovered that libsoup incorrectly handled proxy credentials. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-12547)

It was discovered that libsoup incorrectly handled multipart messages. A remote attacker could possibly use this issue to cause an application to crash or obtain sensitive information. (CVE-2026-12548)