CVE-2026-1760

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):

A flaw was found in libsoup, where the soup_multipart_new_from_message() function is vulnerable to an out-of-bounds read. This flaw allows a malicious HTTP client to induce the libsoup server to read out of bounds.(CVE-2025-32914)

A flaw was found in SoupServer. This HTTP request smuggling vulnerability occurs because SoupServer improperly handles requests that combine Transfer-Encoding: chunked and Connection: keep-alive headers. A remote, unauthenticated client can exploit this by sending specially crafted requests, causing SoupServer to fail to close the connection as required by RFC 9112. This allows the attacker to smuggle additional requests over the persistent connection, leading to unintended request processing and potential denial-of-service (DoS) conditions.(CVE-2026-1760)

A flaw was found in libsoup. An integer underflow vulnerability occurs when processing content with a zero-length resource, leading to a buffer overread. This can allow an attacker to potentially access sensitive information or cause an application level denial of service.(CVE-2026-2369)

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):

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. The libsoup append_param_quoted() function may contain an overflow bug resulting in a buffer under-read.(CVE-2025-32050)

A flaw was found in libsoup. The libsoup soup_uri_decode_data_uri() function may crash when processing malformed data URI. This flaw allows an attacker to cause a denial of service (DoS).(CVE-2025-32051)

A flaw was found in libsoup. The implementation of HTTP range requests is vulnerable to a resource consumption attack. This flaw allows a malicious client to request the same range many times in a single HTTP request, causing the server to use large amounts of memory. This does not allow for a full denial of service.(CVE-2025-32907)

A flaw was found in SoupServer. This HTTP request smuggling vulnerability occurs because SoupServer improperly handles requests that combine Transfer-Encoding: chunked and Connection: keep-alive headers. A remote, unauthenticated client can exploit this by sending specially crafted requests, causing SoupServer to fail to close the connection as required by RFC 9112. This allows the attacker to smuggle additional requests over the persistent connection, leading to unintended request processing and potential denial-of-service (DoS) conditions.(CVE-2026-1760)

A flaw was found in libsoup's SoupServer. A remote attacker could exploit a use-after-free vulnerability where the soup_server_disconnect() function frees connection objects prematurely, even if a TLS handshake is still pending. If the handshake completes after the connection object has been freed, a dangling pointer is accessed, leading to a server crash and a Denial of Service.(CVE-2026-2436)

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)

A flaw was found in SoupServer. This HTTP request smuggling vulnerability occurs because SoupServer improperly handles requests that combine Transfer-Encoding: chunked and Connection: keep-alive headers. A remote, unauthenticated client can exploit this by sending specially crafted requests, causing SoupServer to fail to close the connection as required by RFC 9112. This allows the attacker to smuggle additional requests over the persistent connection, leading to unintended request processing and potential denial-of-service (DoS) conditions.

A flaw was found in SoupServer. This HTTP request smuggling vulnerability occurs because SoupServer improperly handles requests that combine Transfer-Encoding: chunked and Connection: keep-alive headers. A remote, unauthenticated client can exploit this by sending specially crafted requests, causing SoupServer to fail to close the connection as required by RFC 9112. This allows the attacker to smuggle additional requests over the persistent connection, leading to unintended request processing and potential denial-of-service (DoS) conditions.

A flaw was found in SoupServer. This HTTP request smuggling vulnerability occurs because SoupServer improperly handles requests that combine Transfer-Encoding: chunked and Connection: keep-alive headers. A remote, unauthenticated client can exploit this by sending specially crafted requests, causing SoupServer to fail to close the connection as required by RFC 9112. This allows the attacker to smuggle additional requests over the persistent connection, leading to unintended request processing and potential denial-of-service (DoS) conditions.

These are all security issues fixed in the libsoup-3_0-0-3.6.6-2.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the libsoup-2_4-1-2.74.3-18.1 package on the GA media of openSUSE Tumbleweed.

This update for libsoup2 fixes the following issues:

• CVE-2025-4476: null pointer dereference may lead to denial of service (bsc#1243422).
• CVE-2025-14523: Duplicate Host Header Handling Causes Host-Parsing Discrepancy (bsc#1254876).
• CVE-2025-32049: Denial of Service attack to websocket server (bsc#1240751).
• CVE-2026-0716: improper bounds handling may allow out-of-bounds read (bsc#1256418).
• CVE-2026-0719: stack-based buffer overflow in NTLM authentication can lead to arbitrary code execution (bsc#1256399).
• CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests (bsc#1257398).
• CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling HTTP redirects (bsc#1257441).
• CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to HTTP request smuggling and potential DoS (bsc#1257597).
• CVE-2026-2369: Buffer overread due to integer underflow when handling zero-length resources (bsc#1258120).
• CVE-2026-2443: out-of-bounds read when processing specially crafted HTTP Range headers can lead to heap information disclosure to remote attackers (bsc#1258170).
• CVE-2026-2708: HTTP request smuggling via duplicate Content-Length headers (bsc#1258508).

This update for libsoup fixes the following issues:

Update to libsoup 3.6.6:

• CVE-2025-12105: heap use-after-free in message queue handling during HTTP/2 read completion (bsc#1252555).
• CVE-2025-14523: Duplicate Host Header Handling Causes Host-Parsing Discrepancy (bsc#1254876).
• CVE-2025-32049: Denial of Service attack to websocket server (bsc#1240751).
• CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests (bsc#1257398).
• CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling HTTP redirects (bsc#1257441).
• CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to HTTP request smuggling and potential DoS (bsc#1257597).
• CVE-2026-2369: Buffer overread due to integer underflow when handling zero-length resources (bsc#1258120).
• CVE-2026-2443: out-of-bounds read when processing specially crafted HTTP Range headers can lead to heap information disclosure to remote attackers (bsc#1258170).
• CVE-2026-2708: HTTP request smuggling via duplicate Content-Length headers (bsc#1258508).

Changelog:

• websocket: Fix out-of-bounds read in process_frame
• Check nulls returned by soup_date_time_new_from_http_string()
• Numerous fixes to handling of Range headers
• server: close the connection after responsing a request containing Content-Length and Transfer-Encoding
• Use CRLF as line boundary when parsing chunked enconding data
• websocket: do not accept messages frames after closing due to an error
• Sanitize filename of content disposition header values
• Always validate the headers value when coming from untrusted source
• uri-utils: do host validation when checking if a GUri is valid
• multipart: check length of bytes read soup_filter_input_stream_read_until()
• message-headers: Reject duplicate Host headers
• server: null-check soup_date_time_to_string()
• auth-digest: fix crash in soup_auth_digest_get_protection_space()
• session: fix 'heap-use-after-free' caused by 'finishing' queue item twice
• cookies: Avoid expires attribute if date is invalid
• http1: Set EOF flag once content-length bytes have been read
• date-utils: Add value checks for date/time parsing
• multipart: Fix multiple boundry limits
• Fixed multiple possible memory leaks
• message-headers: Correct merge of ranges
• body-input-stream: Correct chunked trailers end detection
• server-http2: Correctly validate URIs
• multipart: Fix read out of buffer bounds under soup_multipart_new_from_message()
• headers: Ensure Request-Line comprises entire first line
• tests: Fix MSVC build error
• Fix possible deadlock on init from gmodule usage
• Updated translations.

This update for libsoup fixes the following issues:

• CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests (bsc#1257398).
• CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling HTTP redirects (bsc#1257441).
• CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to HTTP request smuggling and potential DoS (bsc#1257597).

This update for libsoup fixes the following issues:

• CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests (bsc#1257398).
• CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling HTTP redirects (bsc#1257441).
• CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to HTTP request smuggling and potential DoS (bsc#1257597).

This update for libsoup fixes the following issues:

• CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests (bsc#1257398).
• CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling HTTP redirects (bsc#1257441).
• CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to HTTP request smuggling and potential DoS (bsc#1257597).

This update for libsoup2 fixes the following issues:

• CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests (bsc#1257398).
• CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling HTTP redirects (bsc#1257441).
• CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to HTTP request smuggling and potential DoS (bsc#1257597).

This update for libsoup fixes the following issues:

• CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests (bsc#1257398).
• CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling HTTP redirects (bsc#1257441).
• CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to HTTP request smuggling and potential DoS (bsc#1257597).

This update for libsoup2 fixes the following issues:

• CVE-2025-32049: denial of service attack to websocket server (bsc#1240751).
• CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests (bsc#1257398).
• CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling HTTP redirects (bsc#1257441).
• CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to HTTP request smuggling and potential DoS (bsc#1257597).
• CVE-2026-2369: buffer overread due to integer underflow when handling zero-length resources (bsc#1258120).
• CVE-2026-2443: out-of-bounds read when processing specially crafted HTTP Range headers can lead to heap information disclosure to remote attackers (bsc#1258170).
• CVE-2026-2708: HTTP request smuggling via duplicate Content-Length headers (bsc#1258508).

This update for libsoup fixes the following issues:

• CVE-2025-32049: denial of service attack to websocket server (bsc#1240751).
• CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests (bsc#1257398).
• CVE-2026-1536: HTTP header injection or response splitting via CRLF injection in the Content-Disposition header (bsc#1257440).
• CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling HTTP redirects (bsc#1257441).
• CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to HTTP request smuggling and potential DoS (bsc#1257597).
• CVE-2026-1761: incorrect length calculation when parsing of multipart HTTP responses can lead to a stack-based buffer overflow (bsc#1257598).
• CVE-2026-2369: buffer overread due to integer underflow when handling zero-length resources (bsc#1258120).
• CVE-2026-2443: out-of-bounds read when processing specially crafted HTTP Range headers can lead to heap information disclosure to remote attackers (bsc#1258170).
• CVE-2026-2708: HTTP request smuggling via duplicate Content-Length headers (bsc#1258508).

This update for libsoup fixes the following issues:

• CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests (bsc#1257398).
• CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling HTTP redirects (bsc#1257441).
• CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to HTTP request smuggling and potential DoS (bsc#1257597).

This update for libsoup fixes the following issues:

Update to libsoup 3.6.6:

• CVE-2025-12105: heap use-after-free in message queue handling during HTTP/2 read completion (bsc#1252555).
• CVE-2025-14523: Duplicate Host Header Handling Causes Host-Parsing Discrepancy (bsc#1254876).
• CVE-2025-32049: Denial of Service attack to websocket server (bsc#1240751).
• CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests (bsc#1257398).
• CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling HTTP redirects (bsc#1257441).
• CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to HTTP request smuggling and potential DoS (bsc#1257597).
• CVE-2026-2369: Buffer overread due to integer underflow when handling zero-length resources (bsc#1258120).
• CVE-2026-2443: out-of-bounds read when processing specially crafted HTTP Range headers can lead to heap information disclosure to remote attackers (bsc#1258170).
• CVE-2026-2708: HTTP request smuggling via duplicate Content-Length headers (bsc#1258508).

Changelog:

• websocket: Fix out-of-bounds read in process_frame
• Check nulls returned by soup_date_time_new_from_http_string()
• Numerous fixes to handling of Range headers
• server: close the connection after responsing a request containing Content-Length and Transfer-Encoding
• Use CRLF as line boundary when parsing chunked enconding data
• websocket: do not accept messages frames after closing due to an error
• Sanitize filename of content disposition header values
• Always validate the headers value when coming from untrusted source
• uri-utils: do host validation when checking if a GUri is valid
• multipart: check length of bytes read soup_filter_input_stream_read_until()
• message-headers: Reject duplicate Host headers
• server: null-check soup_date_time_to_string()
• auth-digest: fix crash in soup_auth_digest_get_protection_space()
• session: fix 'heap-use-after-free' caused by 'finishing' queue item twice
• cookies: Avoid expires attribute if date is invalid
• http1: Set EOF flag once content-length bytes have been read
• date-utils: Add value checks for date/time parsing
• multipart: Fix multiple boundry limits
• Fixed multiple possible memory leaks
• message-headers: Correct merge of ranges
• body-input-stream: Correct chunked trailers end detection
• server-http2: Correctly validate URIs
• multipart: Fix read out of buffer bounds under soup_multipart_new_from_message()
• headers: Ensure Request-Line comprises entire first line
• tests: Fix MSVC build error
• Fix possible deadlock on init from gmodule usage
• Updated translations.

This update for libsoup fixes the following issues:

Update to libsoup 3.6.6:

• CVE-2025-12105: heap use-after-free in message queue handling during HTTP/2 read completion (bsc#1252555).
• CVE-2025-14523: Duplicate Host Header Handling Causes Host-Parsing Discrepancy (bsc#1254876).
• CVE-2025-32049: Denial of Service attack to websocket server (bsc#1240751).
• CVE-2026-1467: lack of input sanitization can lead to unintended or unauthorized HTTP requests (bsc#1257398).
• CVE-2026-1539: proxy authentication credentials leaked via the Proxy-Authorization header when handling HTTP redirects (bsc#1257441).
• CVE-2026-1760: improper handling of HTTP requests combining certain headers by SoupServer can lead to HTTP request smuggling and potential DoS (bsc#1257597).
• CVE-2026-2369: Buffer overread due to integer underflow when handling zero-length resources (bsc#1258120).
• CVE-2026-2443: out-of-bounds read when processing specially crafted HTTP Range headers can lead to heap information disclosure to remote attackers (bsc#1258170).
• CVE-2026-2708: HTTP request smuggling via duplicate Content-Length headers (bsc#1258508).

Changelog:

• websocket: Fix out-of-bounds read in process_frame
• Check nulls returned by soup_date_time_new_from_http_string()
• Numerous fixes to handling of Range headers
• server: close the connection after responsing a request containing Content-Length and Transfer-Encoding
• Use CRLF as line boundary when parsing chunked enconding data
• websocket: do not accept messages frames after closing due to an error
• Sanitize filename of content disposition header values
• Always validate the headers value when coming from untrusted source
• uri-utils: do host validation when checking if a GUri is valid
• multipart: check length of bytes read soup_filter_input_stream_read_until()
• message-headers: Reject duplicate Host headers
• server: null-check soup_date_time_to_string()
• auth-digest: fix crash in soup_auth_digest_get_protection_space()
• session: fix 'heap-use-after-free' caused by 'finishing' queue item twice
• cookies: Avoid expires attribute if date is invalid
• http1: Set EOF flag once content-length bytes have been read
• date-utils: Add value checks for date/time parsing
• multipart: Fix multiple boundry limits
• Fixed multiple possible memory leaks
• message-headers: Correct merge of ranges
• body-input-stream: Correct chunked trailers end detection
• server-http2: Correctly validate URIs
• multipart: Fix read out of buffer bounds under soup_multipart_new_from_message()
• headers: Ensure Request-Line comprises entire first line
• tests: Fix MSVC build error
• Fix possible deadlock on init from gmodule usage
• Updated translations.