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CVE-2026-12547— Libsoup: information disclosure in libsoup via soupauthmanager proxy credential leak on proxy switch

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存在信息泄露漏洞，该漏洞源于SoupAuthManager在缓存代理身份验证凭据时未限定作用域至代理主机和端口，导致代理配置更改后缓存的Proxy-Authorization标头发送至新代理，可能泄露凭据。

CVSS 3.4 · Low EPSS 0.23% · P12

Possible ATT&CK Techniques 1 AI

T1552 · Unsecured Credentials

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-2026-12547

Vulnerability Information
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Vulnerability Title
Libsoup: information disclosure in libsoup via soupauthmanager proxy credential leak on proxy switch
Source: CVE Program / CVE List V5
Vulnerability Description
SoupAuthManager caches proxy authentication credentials without scoping them to the proxy authority (host:port). When the proxy configuration changes (e.g., via system settings or WPAD), cached Proxy-Authorization headers from the previous proxy are sent to the new proxy, leaking credentials.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
libsoup 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libsoup是libsoup团队开源的一个HTTP库。 libsoup存在信息泄露漏洞，该漏洞源于SoupAuthManager在缓存代理身份验证凭据时未限定作用域至代理主机和端口，导致代理配置更改后缓存的Proxy-Authorization标头发送至新代理，可能泄露凭据。
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-2026-12547

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III. Intelligence Information for CVE-2026-12547

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Patches & Fixes for CVE-2026-12547 (1)

Vendor Advisories for CVE-2026-12547 (2)

Same Patch Batch · Red Hat · 2026-07-21 · 20 CVEs total

CVE-2026-59851 8.8 HIGH Libssh: libssh: authentication bypass via missing gssapi principal check
CVE-2026-16493 7.8 HIGH Ansible-core: argument injection in ansible-galaxy collection install via git clone (incom
CVE-2026-16445 7.5 HIGH Dracut: dracut: root code execution via dhcp options command injection in networkmanager i
CVE-2026-15927 6.8 MEDIUM Quay: mirror-registry: ssrf: repo-level mirror accepts external_reference without url vali
CVE-2026-15370 6.7 MEDIUM Libssh: libssh: stack buffer overflow in sftp server longname construction
CVE-2026-59843 6.5 MEDIUM Libssh: libssh: denial of service via zero advertised channel packet size
CVE-2026-16461 6.5 MEDIUM Rpcbind: rpcbind: stack buffer overflow in rpcinfo rpcbdump() short-mode version-list form
CVE-2026-59844 6.5 MEDIUM Libssh: libssh: denial of service via oversized sftp read length
CVE-2026-59847 5.9 MEDIUM Libssh: libssh: integrity downgrade via openssl aes-gcm tag verification
CVE-2026-15811 5.8 MEDIUM Kronosnet: kronosnet: encryption key exposure in memory after cryptographic configuration
CVE-2026-59845 5.3 MEDIUM Libssh: libssh: denial of service via unchecked proxycommand fork() failure
CVE-2026-59848 5.3 MEDIUM Libssh: libssh: denial of service via sftp responses with unknown request ids
CVE-2026-15812 4.8 MEDIUM Kronosnet: kronosnet: access control list bypass via link id spoofing on unencrypted dynam
CVE-2026-59850 4.3 MEDIUM Libssh: libssh: use-after-free via data callbacks on closed channels
CVE-2026-12548 4.2 MEDIUM Libsoup: heap out-of-bounds read in libsoup due to integer truncation
CVE-2026-59846 3.9 LOW Libssh: libssh: information disclosure via proxycommand %r username expansion
CVE-2026-59842 3.7 LOW Libssh: libssh: information disclosure via short gssapi curve25519 public key
CVE-2026-59849 3.1 LOW Libssh: libssh: denial of service via automatic certificate authentication loop
CVE-2026-16517 2.9 LOW Libarchive: libarchive: signed integer overflow in archive_write_zip_header

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-201

V. Comments for CVE-2026-12547

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