CVE-2026-0719 Libsoup: signed to unsigned conversion error leading to stack-based buffer overflow in libsoup ntlm authentication
A signed integer overflow in libsoup's NTLM authentication causes a stack-based buffer overflow, leading to application crashes and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-0719?
CVE-2026-0719 is a high-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 8 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw was identified in the NTLM authentication handling of the libsoup HTTP library, used by GNOME and other applications for network communication. When processing extremely long passwords, an internal size calculation can overflow due to improper use of signed integers. This results in incorrect memory allocation on the stack, followed by unsafe memory copying. As a result, applications using libsoup may crash unexpectedly, creating a denial-of-service risk.
Weakness: CWE-121
Which versions are affected by CVE-2026-0719?
Linux distribution packages (3)
libsoup SUSE:Linux Enterprise Server 12 SP5-LTSS | All versions | 2.62.2-5.26.1 |
libsoup SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | All versions | 2.62.2-5.26.1 |
libsoup2 openSUSE:Tumbleweed | All versions | 2.74.3-14.1 |
How do I fix CVE-2026-0719?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-0719 being exploited?
There is no known exploitation of CVE-2026-0719 in the wild and no public exploit code.
Sources
Also known as CLSA-2026-1771000442, DEBIAN-CVE-2026-0719, ECHO-367d-d143-e023, GHSA-8x3f-4jvw-ww73, ROOT-OS-DEBIAN-12-CVE-2026-0719, ROOT-OS-DEBIAN-13-CVE-2026-0719 and 3 more.