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CVE-2026-102560

Medium priority
Needs evaluation

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...

2 affected packages

libsoup2.4, libsoup3

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libsoup2.4 Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
libsoup3 Needs evaluation Needs evaluation Needs evaluation — —
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CVE-2026-102559

Medium priority
Needs evaluation

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...

2 affected packages

libsoup2.4, libsoup3

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libsoup2.4 Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
libsoup3 Needs evaluation Needs evaluation Needs evaluation — —
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CVE-2026-102558

Medium priority
Needs evaluation

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...

2 affected packages

libsoup2.4, libsoup3

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libsoup2.4 Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
libsoup3 Needs evaluation Needs evaluation Needs evaluation — —
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CVE-2026-102555

Medium priority
Needs evaluation

A flaw was found in libsoup. The soup_uri_decode_data_uri() function incorrectly treated base64 data-URI payloads as NUL-terminated strings when calling g_base64_decode_inplace(). If the percent-decoded payload contained embedded...

2 affected packages

libsoup2.4, libsoup3

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libsoup2.4 Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
libsoup3 Needs evaluation Needs evaluation Needs evaluation — —
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CVE-2026-102557

Medium priority
Needs evaluation

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...

2 affected packages

libsoup2.4, libsoup3

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libsoup2.4 Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
libsoup3 Needs evaluation Needs evaluation Needs evaluation — —
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CVE-2026-102556

Medium priority
Needs evaluation

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...

2 affected packages

libsoup2.4, libsoup3

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libsoup2.4 Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
libsoup3 Needs evaluation Needs evaluation Needs evaluation — —
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CVE-2026-85534

Medium priority
Vulnerable

A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2 server can shrink...

2 affected packages

libsoup2.4, libsoup3

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libsoup2.4 Not affected Not affected Not affected Not affected Not affected
libsoup3 Vulnerable Vulnerable Vulnerable — —
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CVE-2026-85197

Medium priority
Vulnerable

A flaw was found in libsoup. A malicious HTTP/2 server or a Man-in-the-Middle (MITM) attacker can exploit a heap use-after-free vulnerability in the HTTP/2 client implementation. This occurs when a GNOME application uploads a file...

2 affected packages

libsoup2.4, libsoup3

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libsoup2.4 Not affected Not affected Not affected Not affected Not affected
libsoup3 Vulnerable Vulnerable Vulnerable — —
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CVE-2026-77680

Medium priority
Vulnerable

An algorithmic complexity flaw exists in libsoup's HTTP Range header processing that persists after the CVE-2025-32907 fix. CVE-2025-32907 addressed memory amplification when a client repeated the same range many times in a single...

2 affected packages

libsoup2.4, libsoup3

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libsoup2.4 Vulnerable Vulnerable Vulnerable Vulnerable Vulnerable
libsoup3 Vulnerable Vulnerable Vulnerable — —
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CVE-2026-77014

Medium priority
Vulnerable

A flaw was found in libsoup's SoupServer HTTP Range header processing. The sort_ranges() comparator in soup-message-headers.c truncates a 64-bit subtraction result to 32-bit int, flipping the sign for range offsets differing by...

2 affected packages

libsoup2.4, libsoup3

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libsoup2.4 Vulnerable Vulnerable Vulnerable Vulnerable Vulnerable
libsoup3 Vulnerable Vulnerable Vulnerable — —
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