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CVE-2026-3099— Libsoup: libsoup: authentication bypass via digest authentication replay attack

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GNOME项目的一款GNOME的HTTP客户端/服务器库。 libsoup存在安全漏洞，该漏洞源于服务器端摘要身份验证实现不当，可能导致绕过身份验证和未经授权访问。

CVSS 5.8 · Medium EPSS 0.36% · P29

Affected Version Matrix 5

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any unaffected
Red Hat Red Hat Enterprise Linux 6 any unknown
Red Hat Red Hat Enterprise Linux 7 any unaffected
Red Hat Red Hat Enterprise Linux 8 any unaffected
Red Hat Red Hat Enterprise Linux 9 any unaffected
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I. Basic Information for CVE-2026-3099

Vulnerability Information
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Vulnerability Title
Libsoup: libsoup: authentication bypass via digest authentication replay attack
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in Libsoup. The server-side digest authentication implementation in the SoupAuthDomainDigest class does not properly track issued nonces or enforce the required incrementing nonce-count (nc) attribute. This vulnerability allows a remote attacker to capture a single valid authentication header and replay it repeatedly. Consequently, the attacker can bypass authentication and gain unauthorized access to protected resources, impersonating the legitimate user.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在加密中重用Nonce与密钥对
Source: CVE Program / CVE List V5
Vulnerability Title
libsoup 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libsoup是GNOME项目的一款GNOME的HTTP客户端/服务器库。 libsoup存在安全漏洞，该漏洞源于服务器端摘要身份验证实现不当，可能导致绕过身份验证和未经授权访问。
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
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
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-3099

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III. Intelligence Information for CVE-2026-3099

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Vendor Advisories for CVE-2026-3099 (2)

Other References for CVE-2026-3099 (1)

Same Patch Batch · Red Hat · 2026-03-12 · 4 CVEs total

CVE-2026-2376 4.9 MEDIUM Mirror-registry: quay: quay: server-side request forgery via open redirect vulnerability i
CVE-2026-3234 4.3 MEDIUM Mod_proxy_cluster: mod_proxy_cluster: response body corruption via crlf injection
CVE-2026-2366 3.1 LOW Keycloak: keycloak: information disclosure via authorization bypass in admin api

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-323

V. Comments for CVE-2026-3099

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