CVE-2026-0719 is a stack-based buffer overflow vulnerability identified in the libsoup HTTP library, which is widely used by GNOME and other network communication applications on Red Hat Enterprise Linux 10.0 Extended Update Support. The vulnerability stems from the NTLM authentication handling code within libsoup, where processing extremely long passwords triggers a signed integer overflow during internal size calculations. This overflow causes the program to allocate insufficient stack memory, followed by unsafe copying of data into this undersized buffer. The result is a classic stack-based buffer overflow that can lead to application crashes, effectively causing a denial-of-service (DoS) condition. The vulnerability is exploitable remotely over the network without requiring authentication or user interaction, as indicated by the CVSS vector (AV:N/AC:L/PR:N/UI:N). The impact on confidentiality and integrity is rated low, but availability impact is high due to potential crashes. Although no known exploits are currently reported in the wild, the high CVSS score of 8.6 reflects the serious nature of the flaw. The vulnerability affects Red Hat Enterprise Linux 10.0 Extended Update Support, a platform commonly used in enterprise environments. Since libsoup is a core library for GNOME and other applications, multiple software components may be indirectly vulnerable. The flaw arises from improper use of signed integers in size calculations, a common programming error leading to memory corruption. This vulnerability highlights the importance of secure input validation and safe memory handling in network authentication protocols. Red Hat has published the vulnerability details but no patch links are currently provided, indicating that fixes may be forthcoming. Organizations should monitor updates closely and prepare to apply patches promptly. In the meantime, mitigating exposure by limiting NTLM authentication usage or isolating vulnerable services can reduce risk. Logging and monitoring for abnormal application crashes related to libsoup usage can help detect exploitation attempts. Given the network-exploitable nature and high severity, this vulnerability demands urgent attention in affected environments.

For European organizations, the primary impact of CVE-2026-0719 is the risk of denial-of-service attacks against applications relying on libsoup for NTLM authentication, particularly those running on Red Hat Enterprise Linux 10.0 Extended Update Support. This can disrupt critical services, especially in sectors like finance, government, and telecommunications where Red Hat systems and GNOME-based applications are prevalent. The vulnerability could lead to unexpected application crashes, causing service outages and potential operational downtime. Although the confidentiality and integrity impacts are low, availability disruptions can have cascading effects on business continuity and user trust. Organizations using NTLM authentication in mixed Windows/Linux environments may face increased exposure. The lack of authentication or user interaction requirements means attackers can exploit this remotely with relative ease, increasing the threat surface. European entities with extensive Red Hat deployments, particularly in countries with strong enterprise Linux adoption, face higher risks. The vulnerability also poses challenges for managed service providers and cloud environments hosting Red Hat 10.0 Extended Update Support instances. Without immediate patches, organizations may need to implement compensating controls to maintain service availability and reduce attack likelihood.

1. Monitor Red Hat security advisories closely and apply official patches for libsoup and related components as soon as they become available. 2. Temporarily disable or restrict NTLM authentication usage in applications and services that rely on libsoup to reduce exposure. 3. Implement network-level filtering to block or limit traffic that attempts NTLM authentication where feasible. 4. Use application-layer firewalls or intrusion prevention systems to detect and block anomalous requests with abnormally long passwords or malformed NTLM authentication attempts. 5. Increase logging and monitoring of applications using libsoup to identify abnormal crashes or suspicious activity indicative of exploitation attempts. 6. Conduct code audits and testing for other applications using libsoup to identify potential similar vulnerabilities. 7. Where possible, migrate to more secure authentication protocols that do not rely on NTLM or vulnerable libsoup versions. 8. Educate system administrators and security teams about this vulnerability to ensure rapid incident response readiness. 9. Employ segmentation and isolation of critical systems running Red Hat Enterprise Linux 10.0 Extended Update Support to limit the blast radius of potential attacks. 10. Coordinate with vendors and service providers to confirm patch availability and deployment timelines.