Summary
The libsoup packages provide an HTTP client and server library for GNOME.
Security Fix(es):
* SoupWebsocketExtensionDeflate: libsoup: libsoup: WebSocket permessage-deflate Unbounded Decompression Remote Denial of Service (CVE-2026-15709)
* libsoup: SoupWebsocketConnection: libsoup: WebSocket remote denial of service via oversized control frame protocol violation (CVE-2026-15711)
* libsoup: libsoup: Heap buffer overflow from WebSocket Pong signal type confusion (CVE-2026-102556)
* libsoup: libsoup: Heap buffer overflow during WebSocket message reassembly (CVE-2026-102557)
* libsoup: libsoup: Heap buffer overflow during WebSocket receive-buffer growth (CVE-2026-102558)
* libsoup: libsoup: Heap buffer overflow during WebSocket client-frame masking (CVE-2026-102559)
* libsoup: libsoup: Heap buffer overflow during outgoing permessage-deflate buffer growth (CVE-2026-102560)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Fixed packages 20
| Release | Package | Fixed in |
|---|---|---|
| Rocky Linux · 9 | libsoup | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-debuginfo | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-debuginfo | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-debuginfo | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-debuginfo | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-debuginfo | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-debugsource | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-debugsource | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-debugsource | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-debugsource | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-debugsource | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-devel | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-devel | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-devel | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-devel | 0:2.72.0-17.el9_9.6 |
| Rocky Linux · 9 | libsoup-devel | 0:2.72.0-17.el9_9.6 |
Vulnerabilities 7
-
High 8.6
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 do…
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High 8.6
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 …
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High 8.6
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 …
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High 8.6
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 o…
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High 8.6
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 b…
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High 7.5
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 limi…
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High 7.5
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 …
References
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2499922
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2499924
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2543229
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2543231
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2543274
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2543285
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report
https://bugzilla.redhat.com/show_bug.cgi?id=2543296
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advisory
https://access.redhat.com/errata/RHSA-2026:98453