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CVE-2026-15712— Soupclientmessageiohttp2: libsoup3: libsoup: http/2 goaway frame parsing heap buffer over-read via invalid nul-termination assumption

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存在缓冲区错误漏洞，该漏洞源于libsoup中的HTTP/2连接跟踪框架处理GOAWAY帧时不当处理“Additional Debug Data”有效载荷，假定数据流为以NUL终止的C字符串，且解析器在读取数据前缺乏严格长度边界验证，可能导致远程未经身份验证的攻击者发送缺少适当空分隔符的特制GOAWAY帧，造成堆缓冲区越界读取，触发应用程序崩溃导致拒绝服务，或可能暴露内存内容。以下版本受到影响：libsoup 3.0版本至3.7.0版

CVSS 5.9 · Medium EPSS 0.50% · P40

Affected Version Matrix 1

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
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I. Basic Information for CVE-2026-15712

Vulnerability Information
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Vulnerability Title
Soupclientmessageiohttp2: libsoup3: libsoup: http/2 goaway frame parsing heap buffer over-read via invalid nul-termination assumption
Source: CVE Program / CVE List V5
Vulnerability Description
A heap buffer over-read vulnerability was discovered in libsoup's (versions: libsoup 3.0 to 3.7.0) HTTP/2 connection tracking framework. When the library processes an HTTP/2 GOAWAY frame, it improperly handles the "Additional Debug Data" payload by assuming the data stream is a safely NUL-terminated C-string. Because the parser lacks strict length-boundary verification before reading this data, a remote, unauthenticated attacker can intentionally send a malformed GOAWAY frame missing the appropriate null delimiter. This causes the library to read past the end of the allocated buffer, triggering an application crash that results in a denial of service (DoS), or potentially exposing fragments of memory contents.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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libsoup中的HTTP/2连接跟踪框架处理GOAWAY帧时不当处理“Additional Debug Data”有效载荷，假定数据流为以NUL终止的C字符串，且解析器在读取数据前缺乏严格长度边界验证，可能导致远程未经身份验证的攻击者发送缺少适当空分隔符的特制GOAWAY帧，造成堆缓冲区越界读取，触发应用程序崩溃导致拒绝服务，或可能暴露内存内容。以下版本受到影响：libsoup 3.0版本至3.7.0版
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 - cpe:/o:redhat:enterprise_linux:10

II. Public POCs for CVE-2026-15712

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III. Intelligence Information for CVE-2026-15712

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Patches & Fixes for CVE-2026-15712 (1)

Vendor Advisories for CVE-2026-15712 (2)

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-2026-15709 7.5 HIGH Soupwebsocketextensiondeflate: libsoup: libsoup: websocket permessage-deflate unbounded de
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-2026-12478 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-125

V. Comments for CVE-2026-15712

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