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, 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 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, 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)

Root has patched CVE-2026-2369 in the libsoup2.4 package for Root:Debian:12. Multiple fixed versions available.

Root has patched CVE-2026-2369 in the libsoup3 package for Root:Debian:13. Multiple fixed versions available.

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.

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: fix integer underflow in sniff_unknown() on zero-length buffer that caused an out-of-bounds read in the content sniffer

• CVE-2026-2369: fix integer underflow in sniff_unknown() on zero-length buffer that caused an out-of-bounds read in the content sniffer

• CVE-2026-2369: fix integer underflow in sniff_unknown() on zero-length buffer that caused an out-of-bounds read in the content sniffer

• CVE-2026-2369: fix integer underflow in sniff_unknown() on zero-length buffer that caused an out-of-bounds read in the content sniffer

• CVE-2026-2369: fix integer underflow in sniff_unknown() on zero-length buffer that caused an out-of-bounds read in the content sniffer

These are all security issues fixed in the libsoup-3_0-0-3.6.5-13.1 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the libsoup-2_4-1-2.74.3-16.1 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 libsoup2 fixes the following issues:

• CVE-2025-32049: denial of Service attack to websocket server (bsc#1240751).
• 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-2026-2369: 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-2026-2369: 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-2026-2369: 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-2026-0716: improper bounds handling may allow out-of-bounds read (bsc#1256418).
• CVE-2025-4476: null pointer dereference may lead to denial of service (bsc#1243422).
• CVE-2025-32049: denial of Service attack to websocket server (bsc#1240751).
• 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 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-2025-12105: Fixed heap use-after-free in message queue handling during HTTP/2 read completion. (bsc#1252555)
• CVE-2025-32049: Fixed a Denial of Service attack to websocket server. (bsc#1240751)
• CVE-2026-2443: Fixed an out-of-bounds read when processing specially crafted HTTP Range headers can lead to heap information disclosure to remote attackers. (bsc#1258170)
• CVE-2026-2369: Fixed a buffer overread due to integer underflow when handling zero-length resources. (bsc#1258120)
• CVE-2026-2708: Fixed 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:

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.

Eric Su and Samuel Dainard discovered that libsoup incorrectly handled content with zero-length resources. An attacker could possibly use this issue to trigger a buffer over-read, resulting in information disclosure or a denial of service. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04 LTS. (CVE-2026-2369)

Kona Arctic discovered that libsoup did not properly protect sensitive cookies when establishing HTTPS tunnels through an HTTP proxy. An attacker could possibly use this issue to intercept session cookies, resulting in session hijacking or user impersonation. (CVE-2026-5119)