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CVE-2026-0719 Red Hat CVE debrief

CVE-2026-0719 is a flaw in the NTLM authentication handling of the libsoup HTTP library. The vulnerability arises from improper use of signed integers when processing extremely long passwords, leading to an internal size calculation overflow. This results in incorrect memory allocation on the stack and unsafe memory copying. Consequently, applications using libsoup may crash unexpectedly, posing a denial-of-service risk. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 8.6, indicating a HIGH severity level. The vulnerability was published on January 8, 2026, and last modified on June 30, 2026.

Vendor
Red Hat
Product
Red Hat Enterprise Linux 10
CVSS
HIGH 8.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-01-08
Original CVE updated
2026-06-30
Advisory published
2026-01-08
Advisory updated
2026-06-30

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.

Official resources

This article is AI-assisted and based on the supplied source corpus.