CVE-2026-66339

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):

A flaw was found in libsoup. The SoupWebsocketConnection may accept a large WebSocket message, which may cause libsoup to allocate memory and lead to a denial of service (DoS).(CVE-2025-32049)

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).(CVE-2026-15709)

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.(CVE-2026-15713)

An out-of-bounds read vulnerability was found in libsoup's multipart processing subsystem. The flaw exists in the soup_multipart_input_stream_read_headers() function inside soup-multipart-input-stream.c, which does not adequately restrict or validate the size of incoming multipart boundary strings. When processing a crafted HTTP response containing a malformed or oversized boundary parameter, the internal stream reader reads past the allocated buffer bounds. A remote, unauthenticated attacker can exploit this behavior to cause a service denial (DoS) through application failure or potentially read fragments of unauthorized memory metadata.(CVE-2026-15714)

A vulnerability classified as problematic has been found in GNOME libsoup (affected version unknown). CWE is classifying the issue as CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. This is going to have an impact on integrity. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.(CVE-2026-3633)

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.(CVE-2026-66339)

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):

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).(CVE-2026-15709)

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.(CVE-2026-15713)

An out-of-bounds read vulnerability was found in libsoup's multipart processing subsystem. The flaw exists in the soup_multipart_input_stream_read_headers() function inside soup-multipart-input-stream.c, which does not adequately restrict or validate the size of incoming multipart boundary strings. When processing a crafted HTTP response containing a malformed or oversized boundary parameter, the internal stream reader reads past the allocated buffer bounds. A remote, unauthenticated attacker can exploit this behavior to cause a service denial (DoS) through application failure or potentially read fragments of unauthorized memory metadata.(CVE-2026-15714)

A vulnerability classified as problematic has been found in GNOME libsoup (affected version unknown). CWE is classifying the issue as CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. This is going to have an impact on integrity. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.(CVE-2026-3633)

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.(CVE-2026-66339)

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):

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).(CVE-2026-15709)

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.(CVE-2026-15713)

An out-of-bounds read vulnerability was found in libsoup's multipart processing subsystem. The flaw exists in the soup_multipart_input_stream_read_headers() function inside soup-multipart-input-stream.c, which does not adequately restrict or validate the size of incoming multipart boundary strings. When processing a crafted HTTP response containing a malformed or oversized boundary parameter, the internal stream reader reads past the allocated buffer bounds. A remote, unauthenticated attacker can exploit this behavior to cause a service denial (DoS) through application failure or potentially read fragments of unauthorized memory metadata.(CVE-2026-15714)

A vulnerability classified as problematic has been found in GNOME libsoup (affected version unknown). CWE is classifying the issue as CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. This is going to have an impact on integrity. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.(CVE-2026-3633)

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.(CVE-2026-66339)

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):

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).(CVE-2026-15709)

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.(CVE-2026-15713)

An out-of-bounds read vulnerability was found in libsoup's multipart processing subsystem. The flaw exists in the soup_multipart_input_stream_read_headers() function inside soup-multipart-input-stream.c, which does not adequately restrict or validate the size of incoming multipart boundary strings. When processing a crafted HTTP response containing a malformed or oversized boundary parameter, the internal stream reader reads past the allocated buffer bounds. A remote, unauthenticated attacker can exploit this behavior to cause a service denial (DoS) through application failure or potentially read fragments of unauthorized memory metadata.(CVE-2026-15714)

A vulnerability classified as problematic has been found in GNOME libsoup (affected version unknown). CWE is classifying the issue as CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. This is going to have an impact on integrity. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.(CVE-2026-3633)

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.(CVE-2026-66339)

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.

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.

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.

These are all security issues fixed in the libsoup-3_0-0-3.8.1-1.1 package on the GA media of openSUSE Tumbleweed.

This update for libsoup fixes the following issues:

• CVE-2026-12547: Header "Proxy-Authorization" leads to credentials being send to different proxy after proxy switch (bsc#1272195).
• CVE-2026-12548: out-of-bounds read in multipart body parser due to an integer truncation (bsc#1272196).
• 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-2026-15713: 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-2026-102555: Heap buffer overflow via uninitialized length in data-URI base64 decoding (bsc#1283299).
• 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-2026-102560: Heap buffer overflow during outgoing permessage-deflate buffer growth (bsc#1283304).
• CVE-2026-103399: incomplete request body draining in HTTP/1.x early responses can allow HTTP request smuggling (bsc#1283831).

This update for libsoup fixes the following issues:

• CVE-2026-12547: Header "Proxy-Authorization" leads to credentials being send to different proxy after proxy switch (bsc#1272195).
• CVE-2026-12548: out-of-bounds read in multipart body parser due to an integer truncation (bsc#1272196).
• 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-2026-15713: 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-2026-102555: Heap buffer overflow via uninitialized length in data-URI base64 decoding (bsc#1283299).
• 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-2026-102560: Heap buffer overflow during outgoing permessage-deflate buffer growth (bsc#1283304).
• CVE-2026-103399: incomplete request body draining in HTTP/1.x early responses can allow HTTP request smuggling (bsc#1283831).

This update for libsoup fixes the following issues:

• CVE-2026-12547: Header "Proxy-Authorization" leads to credentials being send to different proxy after proxy switch (bsc#1272195).
• CVE-2026-12548: out-of-bounds read in multipart body parser due to an integer truncation (bsc#1272196).
• 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-2026-15713: 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-2026-102555: Heap buffer overflow via uninitialized length in data-URI base64 decoding (bsc#1283299).
• 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-2026-102560: Heap buffer overflow during outgoing permessage-deflate buffer growth (bsc#1283304).
• CVE-2026-103399: incomplete request body draining in HTTP/1.x early responses can allow HTTP request smuggling (bsc#1283831).

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).

This update for libsoup2 fixes the following issues:

• 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-2026-77014: Integer truncation in sort_ranges() comparator causes silent omission of HTTP Range responses (bsc#1275988).
• CVE-2026-77680: quadratic CPU denial of service in HTTP Range coalescing after the CVE-2025-32907 fix (bsc#1276759).
• 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-2026-102560: Heap buffer overflow during outgoing permessage-deflate buffer growth (bsc#1283304).
• CVE-2026-103399: incomplete request body draining in HTTP/1.x early responses can allow HTTP request smuggling (bsc#1283831).

This update for libsoup2 fixes the following issues:

• 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-2026-77014: Integer truncation in sort_ranges() comparator causes silent omission of HTTP Range responses (bsc#1275988).
• CVE-2026-77680: quadratic CPU denial of service in HTTP Range coalescing after the CVE-2025-32907 fix (bsc#1276759).
• 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-2026-102560: Heap buffer overflow during outgoing permessage-deflate buffer growth (bsc#1283304).
• 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 HTTP/2 requests. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-4271)

It was discovered that libsoup incorrectly handled certain HTTPS proxy connections. A remote attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-5119)

It was discovered that libsoup incorrectly parsed certain chunked HTTP requests. A remote attacker could possibly use this issue to bypass security controls. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-6324)

It was discovered that libsoup incorrectly handled proxy authentication credentials. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-66339)

It was discovered that libsoup incorrectly handled certain HTTP Range headers. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-77014, CVE-2026-77680)

It was discovered that libsoup incorrectly handled certain HTTP/2 connections. A remote attacker could possibly use this issue to obtain sensitive information or execute arbitrary code. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-85197)

It was discovered that libsoup incorrectly handled certain HTTP/2 transfers. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-85534)

USN-8890-1 fixed vulnerabilities in libsoup. This update provides the corresponding updates for libsoup3 on Ubuntu 26.10.

Original advisory details:

It was discovered that libsoup incorrectly handled certain HTTP/2 requests. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-4271)

It was discovered that libsoup incorrectly handled certain HTTPS proxy connections. A remote attacker could possibly use this issue to obtain sensitive information. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-5119)

It was discovered that libsoup incorrectly parsed certain chunked HTTP requests. A remote attacker could possibly use this issue to bypass security controls. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-6324)

It was discovered that libsoup incorrectly handled proxy authentication credentials. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2026-66339)

It was discovered that libsoup incorrectly handled certain HTTP Range headers. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-77014, CVE-2026-77680)

It was discovered that libsoup incorrectly handled certain HTTP/2 connections. A remote attacker could possibly use this issue to obtain sensitive information or execute arbitrary code. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-85197)

It was discovered that libsoup incorrectly handled certain HTTP/2 transfers. A remote attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-85534)