CVE-2026-121996

high

Description

A length validation flaw in gdbserver's agent-expression parser allows an unauthenticated remote attacker to read uninitialized heap memory from the gdbserver process and cause a denial of service. Disclosed heap content includes addresses suitable for defeating ASLR in further exploitation.

References

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-117573

https://bugzilla.redhat.com/show_bug.cgi?id=2565678

https://access.redhat.com/security/cve/CVE-2026-121996

Details

Source: Mitre, NVD

Published: 2026-11-05

Updated: 2026-11-05

Risk Information

CVSS v2

Base Score: 8.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:C

Severity: High

CVSS v3

Base Score: 8.2

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Severity: High

EPSS

EPSS: 0.00471