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CVE-2026-15709— Soupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded decompression remote denial of service

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libsoup是libsoup团队开源的一个HTTP库。 libsoup存在资源管理错误漏洞，该漏洞源于libsoup的WebSocket实现中permessage-deflate扩展的解压循环未对输出缓冲区大小设置上限，可能导致远程未经验证攻击者通过发送小型高度压缩有效载荷触发无限制内存分配导致OOM崩溃和拒绝服务。以下版本受到影响：Red Hat Enterprise Linux 10、Red Hat Enterprise Linux 8、Red Hat Enterprise Linux 9。

CVSS 7.5 · High EPSS 0.88% · P58
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I. Basic Information for CVE-2026-15709

Vulnerability Information
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Vulnerability Title
Soupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded decompression remote denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
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 limits the incoming compressed frame size via max_incoming_payload_size, it fails to track or limit memory allocation during decompression. A separate check for decompressed size (max_total_message_size) exists but executes only after inflation is complete, and it is entirely disabled by default for client connections. A remote, unauthenticated attacker can exploit this by sending a small, highly compressed payload (a decompression bomb), causing unbounded memory allocation that triggers an Out-of-Memory (OOM) crash and a Denial of Service (DoS).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
libsoup 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libsoup是libsoup团队开源的一个HTTP库。 libsoup存在资源管理错误漏洞，该漏洞源于libsoup的WebSocket实现中permessage-deflate扩展的解压循环未对输出缓冲区大小设置上限，可能导致远程未经验证攻击者通过发送小型高度压缩有效载荷触发无限制内存分配导致OOM崩溃和拒绝服务。以下版本受到影响：Red Hat Enterprise Linux 10、Red Hat Enterprise Linux 8、Red Hat Enterprise Linux 9。
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

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 0:3.6.5-3.el10_2.14 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.6.5-3.el10_0.17 ~ * cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.62.3-2.el8_4.10 ~ * cpe:/a:redhat:rhel_aus:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:2.62.3-2.el8_4.10 ~ * cpe:/a:redhat:rhel_aus:8.4::appstream
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.62.3-2.el8_6.10 ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:2.62.3-2.el8_6.10 ~ * cpe:/a:redhat:rhel_aus:8.6::appstream
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:2.62.3-3.el8_8.11 ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:2.62.3-3.el8_8.11 ~ * cpe:/a:redhat:rhel_e4s:8.8::appstream
Red Hat Red Hat Enterprise Linux 9 0:2.72.0-16.el9_8.3 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.72.0-8.el9_2.13 ~ * cpe:/a:redhat:rhel_e4s:9.2::appstream
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:2.72.0-8.el9_4.12 ~ * cpe:/a:redhat:rhel_e4s:9.4::appstream
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:2.72.0-10.el9_6.9 ~ * cpe:/a:redhat:rhel_eus:9.6::appstream
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8

II. Public POCs for CVE-2026-15709

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III. Intelligence Information for CVE-2026-15709

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Vendor Advisories for CVE-2026-15709 (12)

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

CVE-2026-15711 7.5 HIGH Libsoup: soupwebsocketconnection: libsoup: websocket remote denial of service via oversize
CVE-2026-15714 6.5 MEDIUM Libsoup: soupmultipartinputstream: libsoup: out-of-bounds read in soup_multipart_input_str
CVE-2026-15713 5.9 MEDIUM Libsoup: soupcache: libsoup: http/2 frame window exhaustion remote denial of service via m
CVE-2026-15712 5.9 MEDIUM Soupclientmessageiohttp2: libsoup3: libsoup: http/2 goaway frame parsing heap buffer over-
CVE-2026-12478 4.8 MEDIUM Libsoup: incomplete fix for cve-2026-0716: out-of-bounds read in libsoup websocket frame p

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-409

V. Comments for CVE-2026-15709

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