CVE-2026-0719 Red Hat CVE debrief

Who should care

Organizations using applications that depend on the libsoup HTTP library for network communication should be aware of this vulnerability. This includes users of GNOME and other applications that utilize libsoup for HTTP operations. Given the denial-of-service potential, administrators should prioritize patching or mitigating this vulnerability to ensure service reliability.

Technical summary

The libsoup HTTP library, used by GNOME and other applications, has a flaw in its NTLM authentication handling. The issue arises from the improper use of signed integers when processing long passwords, leading to an overflow in internal size calculations. This causes incorrect stack memory allocation and unsafe memory copying. The vulnerability can lead to unexpected crashes of applications using libsoup, creating a denial-of-service risk. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H, reflecting a HIGH severity score of 8.6. The vulnerability is tracked under CWE-121.

Defensive priority

Given the HIGH severity and denial-of-service potential of CVE-2026-0719, defenders should prioritize patching or mitigating this vulnerability. Immediate actions include checking for and applying any available patches from vendors, reviewing application dependencies for libsoup usage, and implementing compensating controls to monitor and limit potential impacts.

Recommended defensive actions

• Apply patches or updates from vendors as they become available.
• Review application dependencies to identify and address libsoup usage.
• Implement monitoring to detect potential denial-of-service attempts.
• Consider compensating controls such as rate limiting or IP blocking.
• Inventory affected systems and prioritize patching based on risk and exposure.
• Monitor vendor advisories for further guidance and updates.

Evidence notes

The CVE-2026-0719 vulnerability details are based on information from official sources, including the CVE record and NVD detail pages. Additional references from Red Hat provide further context and potential patches. However, given the evolving nature of vulnerability information, it is essential to consult official sources for the latest updates and guidance.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.