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CVE-2026-12478— Libsoup: incomplete fix for cve-2026-0716: out-of-bounds read in libsoup websocket frame processing (unmasked path)

CVSS 4.8 · Medium EPSS 0.25% · P17

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
Red HatRed Hat Enterprise Linux 10anyaffected
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I. Basic Information for CVE-2026-12478

Vulnerability Information
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Vulnerability Title
Libsoup: incomplete fix for cve-2026-0716: out-of-bounds read in libsoup websocket frame processing (unmasked path)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
libsoup 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libsoup是libsoup团队开源的一个HTTP库。 libsoup存在缓冲区错误漏洞，该漏洞源于整数溢出防护未覆盖未掩码的服务器到客户端帧，可能导致恶意WebSocket服务器发送特制的未掩码帧触发越界读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Red HatRed Hat Enterprise Linux 10-cpe:/o:redhat:enterprise_linux:10

II. Public POCs for CVE-2026-12478

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III. Intelligence Information for CVE-2026-12478

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Patches & Fixes for CVE-2026-12478 (1)

Vendor Advisories for CVE-2026-12478 (3)

Same Patch Batch · Red Hat · 2026-07-14 · 6 CVEs total

CVE-2026-157117.5 HIGHLibsoup: soupwebsocketconnection: libsoup: websocket remote denial of service via oversize
CVE-2026-157097.5 HIGHSoupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded de
CVE-2026-157146.5 MEDIUMLibsoup: soupmultipartinputstream: libsoup: out-of-bounds read in soup_multipart_input_str
CVE-2026-157135.9 MEDIUMLibsoup: soupcache: libsoup: http/2 frame window exhaustion remote denial of service via m
CVE-2026-157125.9 MEDIUMSoupclientmessageiohttp2: libsoup3: libsoup: http/2 goaway frame parsing heap buffer over-

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-125

V. Comments for CVE-2026-12478

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