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CVE-2026-103963— Glib-networking: unbounded tls 1.3 session ticket queue growth in glib-networking allows 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.

在 glib-networking 中发现了一个漏洞。当使用传输层安全（TLS）1.3 版本建立连接时，客户端会话缓存未对单个主机保留的会话票据数量进行限制。恶意服务器可通过发送大量会话票据消息利用此漏洞，导致客户端应用程序持续消耗内存。这种无限制的内存增长可能耗尽系统内存，从而引发拒绝服务（DoS）攻击。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-103963

Vulnerability Information
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Vulnerability Title
Glib-networking: unbounded tls 1.3 session ticket queue growth in glib-networking allows remote denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in glib-networking. When establishing connections using Transport Layer Security (TLS) version 1.3, the client-side session cache does not limit the number of session tickets retained for a single host. A malicious server can exploit this by sending excessive session ticket messages, causing the client application to continuously consume memory. This unbounded memory growth can exhaust system memory, resulting in 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
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

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-2026-103963

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III. Intelligence Information for CVE-2026-103963

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Other References for CVE-2026-103963 (3)

Same Patch Batch · Red Hat · 2026-10-30 · 8 CVEs total

CVE-2026-118952 6.5 MEDIUM Kroxylicious-authorizer-acl: kroxylicious: acl prefix matching can bypass authorization ru
CVE-2026-91920 6.5 MEDIUM Undertow: undertow: chunkreader message length permits chunk-size overflow
CVE-2026-110133 5.8 MEDIUM Ghostscript: heap buffer overflow in ghostscript truetype outliner due to npointstotal int
CVE-2026-118959 5.4 MEDIUM Keycloak-services: keycloak-services: required actions bypassed via kc_action parameter
CVE-2026-118947 4.3 MEDIUM Keycloak-services: keycloak-services: authorization bypass via uma resource registration i
CVE-2026-118475 3.6 LOW Eog: eye of gnome: buffer overrun when parsing malicious png files with non-standard iccp
CVE-2026-112922 3.3 LOW Ghostscript: out-of-bounds read in ghostscript shade_next_color via integer overflow of in

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-400