CVE-2026-12478Medium· 4.8▾ TwilightPoC availableThe fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can send a crafted unmasked fram…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 26.4 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 15.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.4%
Last analysed / modified upstream
1 GitHub repo (last check)
The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can send a crafted unmasked frame with a payload length near UINT64_MAX to trigger an OOB read in a libsoup-based client when max_incoming_payload_size is set to 0.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-15709High· 7.5A flaw was found in libsoup's WebSocket implementation when using the permessage-deflate extension
CVE-2026-15711High· 7.5A vulnerability was found in libsoup's WebSocket frame parsing implementation
CVE-2026-0716Medium· 4.8A flaw was found in libsoup’s WebSocket frame processing when handling incoming messages
CVE-2026-90815Medium· 6.3A vulnerability has been found in FFmpeg up to 4.4.6/5.1.8/6.1.4/7.1.3/8.0.1
CVE-2026-90698Medium· 5.3A security flaw has been discovered in memcached 1.6.41/1.6.42/1.6.43
CVE-2026-85197High· 7.6A flaw was found in libsoup